Microsoft IIS URL redirection denial of service
| iis-url-redirection-dos (6981) |  Medium Risk |
Description:
Microsoft Internet Information Server (IIS) is vulnerable to a denial of service attack, caused by a vulnerability in the code that handles URL redirection. If URL redirection has been enabled, a remote attacker can send a URL request with an actual length that is different than the length specified in the request. This causes an access violation error to occur, which causes the service to fail. The service must be restarted to regain normal functionality.
Platforms Affected:
- Microsoft, IIS 4.0
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS03-018. See References.
Note: Microsoft originally provided a patch for this vulnerability in MS01-044, but it has been superseded by the patch released with MS02-018 and MS02-062, and then superseded by the patch released with MS03-018. See References.
Consequences:
Denial of Service
References:
- CIAC Information Bulletin L-132, Microsoft Cumulative Patch for IIS at http://www.ciac.org/ciac/bulletins/l-132.shtml.
- Microsoft Security Bulletin MS01-044, 15 August 2001 Cumulative Patch for IIS at http://www.microsoft.com/technet/security/bulletin/ms01-044.mspx.
- Microsoft Security Bulletin MS02-018, Cumulative Patch for Internet Information Services (Q319733) at http://www.microsoft.com/technet/security/bulletin/ms02-018.mspx.
- Microsoft Security Bulletin MS02-062, Cumulative Patch for Internet Information Service (Q327696) at http://www.microsoft.com/technet/security/Bulletin/MS02-062.mspx.
- Microsoft Security Bulletin MS03-018, Cumulative Patch for Internet Information Service (811114) at http://www.microsoft.com/technet/security/bulletin/ms03-018.mspx.
- Microsoft TechNet Tools and Checklists, Important Information for IIS 4.0 Server Administrators Regarding the "Code Red" Worm at http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/tools/redthree.asp.
- CVE-2001-0545: IIS 4.0 with URL redirection enabled allows remote attackers to cause a denial of service (crash) via a malformed request that specifies a length that is different than the actual length.
- OSVDB ID: 5736: Microsoft IIS Relative Path System Privilege Escalation
- US-CERT VU#544555: Microsoft Internet Information Server 4.0 (IIS) vulnerable to DoS when URL redirecting is enabled
Reported:
Aug 15, 2001
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