iPolicy Networks Security Advisory
 

Microsoft Windows IIS Authentication Memory Corruption Vulnerability 

Date Discovered: 08/06/2010
Severity: Medium
Operating Systems Affected: Windows Server 2003 SP 2
Windows Server 2003 x64 Edition SP 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista SP 1
Windows Vista SP 2
Windows Vista x64 Edition SP 1
Windows Vista x64 Edition SP 2
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems SP 2
Windows Server 2008 for x64-based Systems
Windows Server 2008 for x64-based Systems SP 2
Windows Server 2008 for Itanium-based Systems
Windows Server 2008 for Itanium-based Systems SP 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for Itanium-based Systems
Application Affected: Microsoft Windows Internet Information Services 6.0
Microsoft Windows Internet Information Services 7.0
Microsoft Windows Internet Information Services 7.5
Identifiers: CVE-2010-1256
Synopsis
Microsoft Windows Internet Information Services is susceptible to remote code execution vulnerability due to improper parsing of authentication information. This vulnerability could allow remote code execution if a user opened a specially crafted Web page.
Recommended Actions
Please refer following link provided by Microsoft to apply the appropriate patches:
http://www.microsoft.com/technet/security/Bulletin/MS10-040.mspx
Threat Analysis
A remote code execution vulnerability exists in Internet Information Services (IIS). The vulnerability is due to improper parsing of authentication information.
 
An attacker who successfully exploited this vulnerability could execute code in the context of the Worker Process Identity (WPI).

An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs, view, change, delete data, or create new accounts with full user rights.
References

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-1256

Write-up by: Ashish Joshi