Appendix D: Security Settings

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2, Windows Server Update Services

This appendix lists the recommended security settings for WSUS. The recommendations are categorized into settings for Windows Server 2003, IIS 6.0, and SQL Server 2000.

Windows Server 2003

The following are security recommendations for Windows Server 2003 with WSUS.

Audit Policy

Enable audit events to ensure that adequate logs are collected for system activities.

Audit Policy Settings

Option	Security Setting	Setting Rationale
Audit account logon events	Success, Failure	Auditing for successful and failed logon events provides useful data regarding password brute-forcing attempts.
Audit account management	Success, Failure	Auditing for successful and failed account management events tracks management activities.
Audit directory service access	No Auditing	This is only important for domain controllers running the Active Directory service.
Audit logon events	Success, Failure	Auditing for successful and failed logon events provides useful data regarding password brute-forcing attempts.
Audit object access	No Auditing	Auditing object access is unnecessary and creates many unnecessary logs for WSUS activity.
Audit policy change	Success, Failure	Auditing for successful and failed policy changes tracks management activities.
Audit privilege use	Success, Failure	Auditing for successful and failed privilege use tracks administrator activities.
Audit process tracking	No Auditing	Process-tracking events are unnecessary for WSUS implementations.
Audit system events	Success, Failure	Auditing for successful and failed system events tracks system activities.

Security Options

Configure Windows Server 2003 security settings to help ensure optional security and functionality.

Security Options Settings

Option	Security Setting	Setting Rationale
Accounts: Administrator account status	Enabled	Because it is necessary to have an administrator, the administrator account should be enabled for authorized users.
Accounts: Guest account Status	Disabled	Because it is risky to have guest accounts, the guest account should be disabled unless specifically required.
Accounts: Limit local account use of blank passwords to console logon only	Enabled	Accounts with blank passwords significantly increase the likelihood of network-based attacks.
Accounts: Rename administrator account	Not Defined	Renaming the administrator account forces a malicious individual to guess both the account name and password. Note that even though the account can be renamed, it still uses the same well known SID, and there are tools available to quickly identify this and provide the name.
Accounts: Rename Guest account	Not Defined	Because the guest account is disabled by default, and should never be enabled, renaming the account is not important. However, if an organization decides to enable the Guest account and use it, it should be renamed beforehand.
Audit: Audit the access of global system objects	Enabled	This setting needs to be enabled for auditing to take place in the Event Viewer. The auditing setting can be set to Not Defined, Success or Failure in the Event View.
Audit: audit the use of Backup and Restore privilege	Enabled	For security reasons, this option should be enabled so that auditors will be aware of users creating backups of potentially sensitive data.
Audit: Shut down system immediately if unable to log security audits	Disabled	Enabling this option shuts down the system if it is unable to log audits. This can help prevent missed audit events. Enabling very large log files on a separate partition helps mitigate this.
Devices: Allow undock without having to log on	Disabled	Disabling this option ensures that only authenticated users can dock and undock computers.
Devices: Allowed to format and eject removable media	Administrators	This option is not typically useful for desktop images.
Devices: Prevent users from installing printer drivers	Enabled	Because the Windows GDI system runs in kernel space, allowing a user to install a printer driver could lead to elevated privileges.
Devices: Restrict CD-ROM access to locally logged-on user only	Enabled	Enabling this option prevents remote users from accessing the local CD-ROM, which may contain sensitive information.
Devices: Restrict floppy access to locally logged-on user only	Enabled	In situations where the server is physically secured and password authentication is required by the Recover Console, this option can be enabled to facilitate system recovery.
Devices: Unsigned driver installation behavior	Warn but allow installation	Most driver software is signed. Administrators should not install unsigned drivers unless the origin and authenticity can be verified and the software has been thoroughly tested in a lab environment first. Since only senior administrators will be working on these systems, it is safe to leave this to their discretion.
Domain controller: Allow server operators to schedule tasks	Disabled	The ability to schedule tasks should be limited to administrators only.
Domain controller: LDAP server signing requirements	Not Defined	This option applies only to domain controllers.
Domain controller: Refuse machine account password changes	Disabled	Enabling this option allows machine accounts to automatically change their passwords.
Domain member: Digitally encrypt or sign secure channel data (always)	Disabled	If the domain controller is known to support encryption of the secure channel, this option can be enabled to protect against local network attacks.
Domain member: Digitally encrypt secure channel data (when possible)	Enabled	Enabling this option provides the most flexibility while enabling the highest security when the server supports it.
Domain member: Digitally sign secure channel data (when possible)	Enabled	Enabling this option provides the most flexibility while enabling the highest security when the server supports it.
Domain member: Disable machine account password changes	Disabled	Disabling this option allows machine accounts to automatically change their passwords.
Domain member: Maximum machine account password age	30 days	Less-frequently changed passwords are easier to break than passwords that are changed more frequently.
Domain member: Require strong (Windows 2000 or later) session key	Enabled	Enabling this option sets strong session keys for all computers running Windows 2000 or later.
Interactive logon: Do not display last user name	Enabled	Hiding the last user name should be enabled, especially when the administrator user account is renamed. This helps prevent a passerby from determining account names.
Interactive logon: Do not require CTRL+ALT+DEL	Disabled	The CTRL+ALT+DEL sequence is intercepted at a level lower than user-mode programs are allowed to hook. Requiring this sequence at logon is a security feature designed to prevent a Trojan Horse program masquerading as the Windows logon from capturing users' passwords.
Interactive logon: Message text for users attempting to log on	[provide legal text]	An appropriate legal and warning message should be displayed according to the Corporate Security Policy.
interactive logon: Message title for users attempting to log on	[provide legal title text]	An appropriate legal and warning message should be displayed according to the Corporate Security Policy.
Interactive logon: Number of previous logons to cache (in case domain controller is not available)	10 logons	This option is usually only appropriate for laptops that might be disconnected from their domain. It also presents a security risk for some types of servers, such as application servers. If a server is compromised, and domain logons are cached, the attacker may be able to use this locally stored information to gain domain-level credentials.
Interactive logon: Prompt user to change password before expiration	14 days	Password prompts should be aligned according to the Corporate Security Policy.
Interactive logon: Require Domain Controller authentication to unlock workstation	Enabled	Enabling this option allows a domain controller account to unlock any workstation. This should only be allowed for the local Administrator account on the computer.
Interactive logon: Require smart card	Not Defined	If this system will not be using smart cards, this option is not necessary.
Interactive logon: Smart card removal behavior	Not Defined	If this system will not be using smart cards, this option is not necessary.
Microsoft network client: Digitally sign communications (always)	Disabled	For systems communicating to servers that do not support SMB signing, this option should be disabled. However, if packet authenticity is required, this can be enabled.
Microsoft network client: Digitally sign communications (if server agrees)	Enabled	For systems communicating to servers that do support SMB signing, this option should be enabled.
Microsoft network client: Send unencrypted password to third-party SMB servers	Disabled	If this option is enabled, then a third-party SMB server could negotiate a dialect that does not support cryptographic functions. Authentication would be performed using plain-text passwords.
Microsoft network server: Amount of idle time required before suspending session	15 minutes	This should be set appropriately for the end-user system such that idle connections do not linger, consuming resources.
Microsoft network server: Digitally sign communications (always)	Disabled	For systems communicating to servers that do not support SMB signing, this option should be disabled. However, if packet authenticity is required, this can be enabled.
Microsoft network server: Digitally sign communications (if client agrees)	Enabled	For systems communicating to servers that do not support SMB signing, this option should be disabled. However, if packet authenticity is required, this can be enabled.
Microsoft network server: Disconnect clients when logon hours expire	Enabled	Enabling this option prevents users from logging on after authorized hours.
Network access: Allow anonymous SID/Name translation	Disabled	This option is highly important for securing Windows networking. Disabling it severely restricts the abilities granted to a user connecting with a Null session.
Network access: Do not allow anonymous enumeration of SAM accounts	Enabled	This option is highly important for securing Windows networking. Enabling it severely restricts the abilities granted to a user connecting with a Null session. Because “Everyone” is no longer in the anonymous user’s token, access to IPC$ is disallowed. Pipes that are explicitly set to allow anonymous are inaccessible because the SMB tree connection to this share fails.
Network access: Do not allow anonymous enumeration of SAM accounts and shares	Enabled	This option is highly important for securing Windows networking. Enabling it severely restricts the abilities granted to a user connecting with a Null session. Because “Everyone” is no longer in the anonymous user’s token, access to IPC$ is disallowed. Pipes that are explicitly set to allow anonymous are inaccessible because the SMB tree connection to this share fails.
Network access: Do not allow storage of credentials or .NET passports for network authentication	Enabled	Enabling this option prevents the storage of sensitive passwords in the computers’ cache.
Network access: Let Everyone permissions apply to anonymous users	Disabled	Anonymous users should have no access to computers.
Network access: Named Pipes that can be accessed anonymously	Not Defined	Named pipes should be restricted anonymously. Restricting named pipes breaks some inter-system processes, such as network printing.
Network access: Remotely accessible registry paths	Not Defined	Registry paths should be restricted from remote access unless for monitoring circumstances.
Network access: Shares that can be access anonymously	None	No shares should be accessed anonymously.
Network access: Sharing and security model for local accounts	Guest only – local users authenticate as Guest	Limit all local accounts to Guest privileges.
Network security: do not store LAN Manager hash value on next password change	Enabled	Enabling this feature deletes the weaker LAN Manager hashes, reducing the likelihood of password attacks from sniffing the weak hash over the name or from the local SAM database file.
Network security: Force logoff when logon hours expire	Enabled	This option should be enabled as part of the acceptable policy.
Network security: LAN Manager authentication level	Send NTLMv2 response only	Sending LM is less secure than NTLM, and should only be enabled if the system will communicate with computers running Windows 95 or Windows 98. Additionally, use NTLMv2 only; however, computers running Windows 95, Windows 98, or un-patched Windows NT4.0 will not be able to communicate with servers running NTLMv2.
Network security: LDAP client signing requirements	Negotiate signing	Require signing when authenticating to third party LDAP servers. This prevents attacks against rogue LDAP servers and clear-text submission of passwords over the network.
Network security: Minimum session security for NTLM SSP based (including secure RPC) clients	Require NTLMv2 session security	The NTLM hashes contain weakness that attacks may exploit. Enabled, these requirements strengthen the authentication algorithms for Windows.
Network security: Minimum session security for NTLM SSP based (including secure RPC) servers	Require NTLMv2 session security	The NTLM hashes contain weakness that attacks may exploit. Enabled, these requirements will strengthen the authentication algorithms for Windows.
Recovery console: Allow automatic administrative logon	Disabled	If automatic administrative logon is enabled, then a malicious user that has console access could simply restart the computer and gain administrative privileges. However, an organization may enable this feature if the computer is a physically secure server, allowing access to the system if the administrator password is forgotten.
Recovery console: Allow floppy copy and access to all drives and all folders	Disabled	The recover console can be used as an attack method to gain access to SAM database files offline; therefore, this option should be enabled to prevent those files from being copied to a floppy disk.
Shutdown: Allow system to be shut down without having to log on	Disabled	This option is used to prevent users without valid accounts from shutting down the system, and is a good precautionary measure.
Shutdown: Clear virtual memory pagefile	Disabled	Clearing the memory pagefile at shutdown can help prevent offline analysis of the file, which might contain sensitive information from system memory, such as passwords. However, in situations where the computer is physically secured, this can be enabled to reduce time required for system restarts.
System cryptography: Force strong key protection for user keys stored on the computer	User is prompted when the key is first used	Protecting local cryptographic secrets helps prevent privilege escalation across the network, once access to one system is obtained.
System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing	Not Defined	Require stronger, standard, and compliant algorithms for encryption, hashing, and signing.
System Objects: Default owner for objects created by members of the Administrators group	Administrators group	Administrators should only have access to the created file.
System objects: Require case insensitivity for non-Windows subsystems	Disabled	Require case-sensitivity for non-Windows subsystems, such as UNIX passwords.
System settings: Optional subsystems	Enter POSIX here only if expressly required	The POSIX execution layer has had multiple local exploits in the past, and should be disabled unless required by third-party software. It is extremely rare for POSIX to be required by commercial software packages.
System settings: Use Certificate Rules on Windows executables for Software Restriction policies	Not Defined	When certificate rules are created, enabling this option enforces software restriction policies that check a CRL to make sure the software's certificate and signature are valid.

Event Log Settings

Configure Event Log settings to help ensure an adequate level of activity monitoring.

Event Log Settings

Option	Security Setting	Setting Rationale
Maximum application log Size	100489 kilobytes	A large event log allows administrators to store and search for problematic and suspicious events.
Maximum security log size	100489 kilobytes	A large event log allows administrators to store and search for problematic and suspicious events.
Maximum system log size	100489 kilobytes	A large event log allows administrators to store and search for problematic and suspicious events.
Prevent local guests group from accessing application log	Enabled	Guest accounts should not be able to access sensitive information in the event log.
Prevent local guests group from accessing security log	Enabled	Guest accounts should not be able to access sensitive information in the event log.
Prevent local guests group from accessing system log	Enabled	Guest accounts should not be able to access sensitive information in the event log.
Retain application log	7 Days	After a week, logs should be stored on a centralized log server.
Retain security log	7 Days	After a week, logs should be stored on a centralized log server.
Retain system log	7 Days	After a week, logs should be stored on a centralized log server.
Retention method for application log	As Needed	Overwrite audit logs as needed when log files have filled up.
Retention method for security log	As Needed	Overwrite audit logs as needed when log files have filled up.
Retention method for system log	As Needed	Overwrite audit logs as needed when log files have filled up.

System Services

Enable only services that are required for WSUS.

Enabled Operating System Services

Option	Security Setting	Setting Rationale
Alerter	Disabled	The alerter service is of most use when an administrator is logged into the network and wants to be notified of events. For computers running WSUS, the service is not necessary.
Application Management	Manual	This service is only necessary when installing new applications to the environment with Active Directory.
Automatic Updates	Automatic	This service is required in order to support a fully patched operating environment.
Clipbook	Disabled	This service is unnecessary to the WSUS environment.
COM+ Event System	Manual	The COM+ event system might be used in the Web-based application.
Computer Browser	Automatic	The computer browser service is required on interactive workstations.
DHCP Client	Automatic	DHCP is necessary to have an IP address on the WSUS server.
Distributed File System	Disabled	DFS is used for file sharing across multiple servers, which is not needed for WSUS.
Distributed Link Tracking Client	Disabled	This service is only appropriate if a domain has distributed link tracking configured.
Distributed Link Tracking Server	Disabled	This service is only appropriate if a domain has distributed link tracking configured.
Distributed Transaction Coordinator	Disabled	This service is only appropriate if a domain has distributed link tracking configured.
DNS Client	Automatic	DNS is necessary for IP-address-to-name resolution.
Event Log	Automatic	The Event Log service is important for logging events on the system and provides critical auditing information.
File Replication	Disabled	This service is used for file replication and synchronization, which is not necessary for WSUS.
IIS ADMIN service	Automatic	This service is required for WSUS administration.
Indexing Service	Manual	This service is used by IIS.
Intersite Messaging	Disabled	This service only needs to be enabled on domain controllers.
Internet Connection Firewall / Internet Connection Sharing	Manual	This service is required if the local ICF firewall is being used.
IPSEC Services	Automatic	This service is required if IPsec has been utilized.
Kerberos Key Distribution Center	Disabled unless functioning as a domain controller	This service is enabled by default in order to join and authenticate to Windows Server 2003 domain controllers.
License Logging Service	Disabled	This service is used on systems where application licensing must be tracked.
Logical Disk Manager	Automatic	This service is used in logical disk management.
Logical Disk Manager Administrative Service	Manual	This service is used in logical disk management.
Messenger	Disabled	This service is only necessary if NetBIOS messaging is being used.
Net Logon	Automatic	This service is necessary to belong to a domain.
NetMeeting Remote Desktop Sharing	Disabled	NetMeeting is an application that allows collaboration over a network. It is used on interactive workstations, and should be disabled for servers as it presents a security risk.
Network Connections	Manual	This service allows network connections to be managed centrally.
Network DDE	Disabled	Network DDE is a form of interprocess communication (IPC) across networks. Because it opens network shares and allows remote access to local resources, it should be disabled unless explicitly needed.
Network DDE DSDM	Disabled	Network DDE is a form of interprocess communication (IPC) across networks. Because it opens network shares and allows remote access to local resources, it should be disabled unless explicitly needed.
NTLM Security Support Provider	Manual	The NTLM Security Support Provider is necessary to authenticate users of remote procedure call (RPC) services that use transports such as TCP and UDP.
Performance Logs and Alerts	Manual	This service is only necessary when logs and alerts are used.
Plug and Play	Automatic	Plug and Play is needed if the system uses Plug-and-Play hardware devices.
Print Spooler	Disabled	This service is necessary if the system is used for printing.
Protected Storage	Automatic	This service must be enabled because the IIS Admin service depends on it.
Remote Access Auto Connection Manager	Disabled	Enable this service only for RAS servers.
Remote Access Connection Manager	Disabled	Enable this service only for RAS servers.
Remote Procedure Call (RPC)	Automatic	This service is required for RPC communications.
Remote Procedure Call (RPC) Locator	Manual	This service is required for RPC communications.
Remote Registry	Manual	Remote Registry is a key target for attackers, viruses, and worms, and should be set to manual unless otherwise needed, where the server can enable it.
Removable Storage	Manual	For a dynamic server, this service is necessary.
Routing and Remote Access	Disabled	Enable this service only for RAS servers.
Security Accounts Manager	Automatic	This service should be enabled, as it manages local accounts.
Server	Automatic	This service should be enabled or disabled as necessary. The service supports file, print, and named-pipe sharing over the network for this computer.
Smart Card	Manual	Because users will not be using smart cards for two-factor logon authentication, this service is unnecessary and should be disabled or set to manual.
System Event Notification	Automatic	This service is needed for COM+ events.
Task Scheduler	Manual	This service should be enabled/disabled as necessary. The service enables a user to configure and schedule automated tasks on this computer.
TCP/IP NetBIOS Helper	Automatic	This service is used in Windows networking for computers running an operating system earlier than Windows Server 2003.
Telephony	Disabled	This service is not necessary in this environment because telephony devices are not used.
Telnet	Disabled	The telnet service should be disabled and its use strongly discouraged.
Terminal Services	Manual	Terminal services should be enabled or disabled as necessary.
Uninterruptible Power Supply	Manual	This service is necessary if a UPS is used.
Windows Installer	Manual	Users may choose to use Windows Installer to install .msi packages on the system, and therefore this service should be set to manual.
Windows Management Instrumentation	Manual	WMI provides extended management capabilities.
Windows Management Instrumentation Driver Extensions	Manual	WMI Driver Extensions allow monitoring of NIC connection state in the taskbar.
Windows Time	Automatic	External time synchronization is required for Kerberos key exchange in Active Directory environments.
Workstation	Automatic	The workstation service is necessary for Windows networking.

TCP/IP Hardening

Microsoft recommends that you harden the TCP/IP interface for WSUS servers.

Warning

If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
SynAttackProtect

Security Setting	Setting Rationale
REG_DWORD = 2	Causes TCP to adjust retransmission of SYN-ACKS.

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
TcpMaxPortsExhausted

Security Setting	Setting Rationale
REG_DWORD = 1	Helps protect against SYN attacks.

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
TCPMAxHALFOPEN

Security Setting	Setting Rationale
REG_DWORD = 500	Helps protect against SYN attacks.

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
TCPmaxhalfopenretired

Security Setting	Setting Rationale
REG_DWORD = 400	Helps protect against SYN attacks.

HKLM\SYSTEM\CURRENTCONTROLSET\SERVICES\AFd\parameters\
enabledICMPredirect

Security Setting	Setting Rationale
REG_DWORD = 0	Prevents the creation of expensive host routes when an ICMP redirect packet is received.

HKLM\SYSTEM\CURRENTCONTROLSET\SERVICES\tcpip\parameters\
enableddeadgwdetect

Security Setting	Setting Rationale
REG_DWORD = 0	Prevents the forcing of switching to a secondary gateway.

HKLM\SYSTEM\CURRENTCONTROLSET\SERVICES\tcpip\parameters\
disableipsourcerouting

Security Setting	Setting Rationale
REG_DWORD = 1	Disables IP source routing.

HKLM\SYSTEM\CURRENTCONTROLSET\SERVICES\tcpip\parameters\
ipenabledrouter

Security Setting	Setting Rationale
REG_DWORD = 0	Disables forwarding of packets between network interfaces.

IIS 6.0 Security Settings

The following are security recommendations for IIS 6.0 with WSUS.

URLScan

Use the following settings in URLScan to help protect the administrative Web page for WSUS. The complete Urlscan.ini file is located at the end of this topic.

Option	ISEC Setting	Setting Rationale
UseAllowVerbs	1	Uses the [AllowVerbs] section of Urlscan.ini, which only allows GET, HEAD, and POST.
UseAllowExtensions	0	Uses the [DenyExtensions] section of Urlscan.ini. Allow the following: ASP Request: .asp, .cer, .cdx, .asa Executables: .bat, .cmd, .com - Note that .exe must be enabled for WSUS. Scripts: .htw, .ida, .idq, .htr, .idc, .shtm, .shtml, .stm, .printer Static Files: .ini, .log, .pol, .dat
NormalizeUrlBeforeScan	1	Canonicalizes URL before processing.
VerifyNormalization	1	Canonicalizes URL twice and reject request if a change occurs.
AllowHighBitCharacters	0	Does not allow high bit characters.
Allow Dot in Paths	0	Does not allow any periods in paths.
Remove Server Header	1	Removes server information from header response.
Per Process Logging	1	Enables the PID in Urlscan.log. This allows extra logging information for URLScan.
AllowLateScanning	0	Ensures that URLScan is a high priority.
PerDayLogging	1	Specifies that URLScan produces a new log each day with activity in the form 'Urlscan.010101.log'.
UseFastPathReject	0	Specifies that URLScan uses the RejectResponseUrl or allows IIS to log the request.
LogLongUrls	0	Specifies that only 1K can be logged per request.

IIS Security Configuration

Consider enabling the following three security settings on the IIS Web server to help ensure secure WSUS administration.

Enable general error messages

By default, IIS gives detailed error messages to remote Web clients. We recommend enabling IIS general (less detailed) error messages. This prevents an unauthorized user from probing the IIS environment with IIS error messages.

To enable general IIS error messages

1. On the Start menu, point to Programs, point to Administrator Tools, and then click Internet Information Services Manager.

2. Expand the local computer node.

3. Right-click WebSites, and then click Properties.

4. On the Home Directory tab, clickConfiguration.

5. On the Debugging tab, click Send the following text error message to client.

Enable additional logging options

By default, IIS enables logging for a number of options. However, we recommend logging several additional key options.

To add key IIS logging parameters

1. On the Start menu, point to Programs, point to Administrator Tools, and then click Internet Information Services Manager.

2. Expand the local computer node.

3. Right-click WebSites, and then click Properties.

4. On the Web Site tab, click Properties.

5. On the Advanced tab, select the check boxes for the following logging options:

   • Server name

   • Time taken

   • Host

   • Cookie

   • Referer

Remove header extensions

By default, IIS enables header extensions for HTTP requests. We recommend removing any header extensions for IIS.

To remover headers extensions for HTTP requests

1. On the Start menu, point to Programs, point to Administrator Tools, and then click Internet Information Services Manager.

2. Expand the local computer node.

3. Right-click WebSites, and then click Properties.

4. On the HTTP Headers tab, select X-Powered-By: ASP.NET, and then click Remove.

SQL Server 2000

The following are security recommendations for SQL Server 2000 with WSUS.

SQL Registry Permissions

Use access control permissions to secure the SQL Server 2000 registry keys.

HKLM\SOFTWARE\MICROSOFT\MSSQLSERVER

ISEC Setting	Rationale
Administrators: Full Control SQL Service Account: Full Control System: Full Control	These settings help ensure limited access to the application’s registry key to authorized administrators or system accounts.

Stored Procedures

Remove all stored procedures that are unnecessary and that have the ability to control the database server remotely.

Unnecessary SQL Server 2000 Stored Procedures

Description	Stored Procedures	Rationale
Delete the following stored procedure by using the following command: use master exec sp_dropextendedproc stored procedure where stored procedure is the name of the stored procedure to be deleted.	Sp_OACreate Sp_OADestroy Sp_OAGetErrorInfo Sp_OAGetProperty Sp_OAMethod Sp_OASetProperty SP_OAStop Xp_regaddmultistring Xp_regdeletekey Xp_regdeletevalue Xp_regenumvalues Xp_regread Xp_regremovemultistring Xp_regwrite sp_sdidebug xp_availablemedia xp_cmdshell xp_deletemail xp_dirtree xp_dropwebtask xp_dsninfo xp_enumdsn	Remove all stored procedures that are not necessary for WSUS and could possibly give unauthorized users the ability to perform command-line actions on the database.
	xp_enumerrorlogs xp_enumgroups xp_eventlog xp_findnextmsg xp_fixeddrives xp_getfiledetails xp_getnetname xp_logevent xp_loginconfig xp_makewebtask xp_msver xp_readerrorlog xp_readmail xp_runwebtask xp_sendmail xp_sprintf xp_sscanf xp_startmail xp_stopmail xp_subdirs xp_unc_to_drive

Urlscan.ini file

The following is a facsimile of the complete Urlscan.ini file.

[options]

UseAllowVerbs=1                ; If 1, use [AllowVerbs] section, else use the
                               ; [DenyVerbs] section.

UseAllowExtensions=0           ; If 1, use [AllowExtensions] section, else use
                               ; the [DenyExtensions] section.

NormalizeUrlBeforeScan=1       ; If 1, canonicalize URL before processing.

VerifyNormalization=1          ; If 1, canonicalize URL twice and reject request
                               ; if a change occurs.

AllowHighBitCharacters=0       ; If 1, allow high bit (ie. UTF8 or MBCS)
                               ; characters in URL.

AllowDotInPath=0               ; If 1, allow dots that are not file extensions.

RemoveServerHeader=1           ; If 1, remove the 'Server' header from response.

EnableLogging=1                ; If 1, log UrlScan activity.

PerProcessLogging=1            ; If 1, the UrlScan.log filename will contain a PID
                               ; (ie. UrlScan.123.log).

AllowLateScanning=0            ; If 1, then UrlScan will load as a low priority
                               ; filter.

PerDayLogging=1                ; If 1, UrlScan will produce a new log each day with
                               ; activity in the form 'UrlScan.010101.log'.

UseFastPathReject=0            ; If 1, then UrlScan will not use the
                               ; RejectResponseUrl or allow IIS to log the request.

LogLongUrls=0                  ; If 1, then up to 128K per request can be logged.
                               ; If 0, then only 1k is allowed.

;
; If UseFastPathReject is 0, then UrlScan will send
; rejected requests to the URL specified by RejectResponseUrl.
; If not specified, '/<Rejected-by-UrlScan>' will be used.
;

RejectResponseUrl=

;
; LoggingDirectory can be used to specify the directory where the
; log file will be created.  This value should be the absolute path
; (ie. c:\some\path).  If not specified, then UrlScan will create
; the log in the same directory where the UrlScan.dll file is located.
;

LoggingDirectory=C:\WINDOWS\system32\inetsrv\urlscan\logs

;
; If RemoveServerHeader is 0, then AlternateServerName can be
; used to specify a replacement for IIS's built in 'Server' header
;

AlternateServerName=

[RequestLimits]

;
; The entries in this section impose limits on the length
; of allowed parts of requests reaching the server.
;
; It is possible to impose a limit on the length of the
; value of a specific request header by prepending "Max-" to the
; name of the header.  For example, the following entry would
; impose a limit of 100 bytes to the value of the
; 'Content-Type' header:
;
;   Max-Content-Type=100
;
; To list a header and not specify a maximum value, use 0
; (ie. 'Max-User-Agent=0').  Also, any headers not listed
; in this section will not be checked for length limits.
;
; There are 3 special case limits:
;
;   - MaxAllowedContentLength specifies the maximum allowed
;     numeric value of the Content-Length request header.  For
;     example, setting this to 1000 would cause any request
;     with a content length that exceeds 1000 to be rejected.
;     The default is 30000000.
;
;   - MaxUrl specifies the maximum length of the request URL,
;     not including the query string. The default is 260 (which
;     is equivalent to MAX_PATH).
;
;   - MaxQueryString specifies the maximum length of the query
;     string.  The default is 2048.
;

MaxAllowedContentLength=30000000
MaxUrl=260
MaxQueryString=2048

[AllowVerbs]

;
; The verbs (aka HTTP methods) listed here are those commonly
; processed by a typical IIS server.
;
; Note that these entries are effective if "UseAllowVerbs=1"
; is set in the [Options] section above.
;

GET
HEAD
POST

[DenyVerbs]

;
; The verbs (aka HTTP methods) listed here are used for publishing
; content to an IIS server via WebDAV.
;
; Note that these entries are effective if "UseAllowVerbs=0"
; is set in the [Options] section above.
;

PROPFIND
PROPPATCH
MKCOL
DELETE
PUT
COPY
MOVE
LOCK
UNLOCK
OPTIONS
SEARCH

[DenyHeaders]

;
; The following request headers alter processing of a
; request by causing the server to process the request
; as if it were intended to be a WebDAV request, instead
; of a request to retrieve a resource.
;

Translate:
If:
Lock-Token:
Transfer-Encoding:

[AllowExtensions]

;
; Extensions listed here are commonly used on a typical IIS server.
;
; Note that these entries are effective if "UseAllowExtensions=1"
; is set in the [Options] section above.
;

.htm
.html
.txt
.jpg
.jpeg
.gif

[DenyExtensions]

;
; Extensions listed here either run code directly on the server,
; are processed as scripts, or are static files that are
; generally not intended to be served out.
;
; Note that these entries are effective if "UseAllowExtensions=0"
; is set in the [Options] section above.
;
; Also note that ASP scripts are denied with the below
; settings.  If you wish to enable ASP, remove the
; following extensions from this list:
;    .asp
;    .cer
;    .cdx
;    .asa
;

; Deny ASP requests
.asp
.cer
.cdx
.asa

; Deny executables that could run on the server
;.exe
.bat
.cmd
.com

; Deny infrequently used scripts
.htw     ; Maps to webhits.dll, part of Indexing Service
.ida     ; Maps to idq.dll, part of Indexing Service
.idq     ; Maps to idq.dll, part of Indexing Service
.htr     ; Maps to ism.dll, a legacy administrative tool
.idc     ; Maps to httpodbc.dll, a legacy database access tool
.shtm    ; Maps to ssinc.dll, for Server Side Includes
.shtml   ; Maps to ssinc.dll, for Server Side Includes
.stm     ; Maps to ssinc.dll, for Server Side Includes
.printer ; Maps to msw3prt.dll, for Internet Printing Services

; Deny various static files
.ini     ; Configuration files
.log     ; Log files
.pol     ; Policy files
.dat     ; Configuration files

[DenyUrlSequences]
..  ; Don't allow directory traversals
./  ; Don't allow trailing dot on a directory name
\   ; Don't allow backslashes in URL
:   ; Don't allow alternate stream access
%   ; Don't allow escaping after normalization
&   ; Don't allow multiple CGI processes to run on a single request