Title: Microsoft IIS 4.0/5.0 Malformed .htr Request Vulnerability
Severity: MODERATE
Description:
The virtual directory within IIS 4.0 and 5.0 contains .htr files which permits users to change passwords remotely. If a user initiates a password change request containing malformed data, the server CPU becomes fully utilized until the administrator performs a reboot to regain normal functionality.
The patch available for this issue creates a similar vulnerability which is exploited by appending %3F+.htr to a request.
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 IIS 4.0.0alpha
- Microsoft IIS 5.0
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
- Microsoft Windows NT 4.0 Option Pack
References:
- Microsoft: Frequently Asked Questions: Microsoft Security Bulletin (MS00-031)
- Microsoft: Q260069: Malformed HTR Request Returns Source Code for ASP Scripting Files
- Microsoft: Q260838: IIS Stops Servicing HTR Requests
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