Title: Microsoft IIS and PWS Extended Unicode Directory Traversal Vulnerability
Severity: HIGH
Description:
Microsoft IIS 4.0 and 5.0 are both vulnerable to double dot "../" directory traversal exploitation if extended UNICODE character representations are used in substitution for "/" and "\".
Unauthenticated users may access any known file in the context of the IUSR_machinename account. The IUSR_machinename account is a member of the Everyone and Users groups by default, therefore, any file on the same logical drive as any web-accessible file that is accessible to these groups can be deleted, modified, or executed.
Successful exploitation would yield the same privileges as a user who could successfully log onto the system to a remote user possessing no credentials whatsoever.
It has been discovered that a Windows 98 host running Microsoft Personal Web Server is also subject to this vulnerability. (March 18, 2001)
This is the vulnerability exploited by the Code Blue Worm.
**UPDATE**: It is believed that an aggressive worm may be in the wild that actively exploits this vulnerability.
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 NT Option Pack for NT 4.0 0.0.0
- Microsoft Personal Web Server 4.0.0
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
- Microsoft Windows 98
- Microsoft Windows NT 4.0 Option Pack
References:
- CORE Security: IIS UNICODE exploit
- F-Secure: F-Secure Computer Virus Information Pages: CodeBlue
- Microsoft: Frequently Asked Questions: Microsoft Security Bulletin (MS00-078)
- Trend Micro: TROJ_BLUECODE.A
- VanMeter, John <john.vanmeter@ost.dot.gov>: FW: ISSalert: ISS Alert: Code Blue Worm
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