Title: Microsoft IIS 4.0 URL Redirection DoS Vulnerability
Severity: MODERATE
Description:
A vulnerability exists in IIS 4.0 with URL redirection enabled, which could cause the server to stop responding.
The problem lies in IIS's handling of URL redirection. If a request is made which appears to be of accepted length, but in acutuality the request reveals itself to be of unusual length IIS will fail.
This vulnerability is currently being exploited by the 'Code Red' worm. The worm sends a request to an IIS host attempting to exploit a previously discovered vulnerability (BID 2880). The request made contains incorrect length information which successfully affects normal functionality on a IIS 4.0 host.
A restart of the service is required in order to regain normal functionality.
Affected Products:
- Cisco Building Broadband Service Manager 5.0.0
- Cisco Call Manager 1.0.0
- Cisco Call Manager 2.0.0
- Cisco Call Manager 3.0.0
- Cisco ICS 7750 0.0.0
- Cisco IP/VC 3540 Video Rate Matching Module 0.0.0
- Cisco Unity Server 2.0.0
- Cisco Unity Server 2.2.0
- Cisco Unity Server 2.3.0
- Cisco Unity Server 2.4.0
- Cisco uOne 1.0.0
- Cisco uOne 2.0.0
- Cisco uOne 3.0.0
- Cisco uOne 4.0.0
- Microsoft BackOffice 4.0.0
- Microsoft BackOffice 4.5.0
- Microsoft IIS 4.0.0
- Microsoft Windows NT 4.0 Option Pack
References:
- CERT: CERT Incident Note IN-2001-10: "Code Red" Worm Crashes IIS 4.0 Servers with URL
- Microsoft: A Very Real and Present Threat to the Internet
- Microsoft: Microsoft Security Bulletin MS01-033
- Microsoft: Microsoft Security Bulletin MS01-044
- Microsoft: Microsoft Technet Security
- SecurityFocus: MS Index Server and Indexing Service ISAPI Extension Buffer Overflow Vulnerabili
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