Vulnerability Alert

Microsoft Internet Information Services Authentication Bypass Vulnerability

 
Threat Type:CWE-287: Authentication Issues
IntelliShield ID:20826
Version:3
First Published:2010 July 02 19:20 GMT
Last Published:2010 September 14 18:31 GMT
Port: 80
CVE:CVE-2010-2731
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.9
 
Version Summary:Microsoft has released a security bulletin and software updates to address the Microsoft Internet Information Services authentication bypass vulnerability.
 
 
Description

Microsoft Internet Information Services version 5.1 when running on Windows XP platforms contains a vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and gain unauthorized access.

The vulnerability is due to improper processing of malformed values with URLs.  An unauthenticated, remote attacker could exploit the vulnerability by sending a malicious URL to a targeted system.  If successful, the attacker could gain unauthorized access to a protected directory.

Proof-of-concept code that exploits this vulnerability is publicly available.

Microsoft has confirmed this vulnerability in a security bulletin and released software updates.

 
Warning Indicators

Microsoft IIS 5.1 running on Windows XP SP3 and prior is vulnerable.

 
IntelliShield Analysis

Reports indicate that only IIS 5.1 is vulnerable.  This software is included only with Windows XP systems and is not installed by default.  Additionally, systems are only affected when basic authentication is configured, which is considered generally unsafe because passwords are sent in plain text to the targeted system.  Windows XP systems are also unlikely to host critical sites or applications, greatly reducing the potential for affected systems.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the September 2010 security bulletin release. This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for September 2010

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-065

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to bypass authentication protections on the web server, allowing the attacker to gain unauthorized access to protected pages.

 
Technical Information

The vulnerability is due to improper processing of values sent by URL.  An unauthenticated, remote attacker could exploit the vulnerability by sending a URL containing malicious values to a web server.  The processing of the request could cause the application to return the contents of a password-protected web directory, allowing the attacker to access protected content.

 
Safeguards

Administrators are advised to apply the available software updates.

Administrators may consider employing authentication methods other than basic authentication.

Administrators are advised to monitor critical systems.

 
Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
29479/0Microsoft Internet Information Services Remote Code Execution VulnerabilityS5122010 Sep 14 
Cisco Small Business IPS
Signature IDSignature NameReleaseLatest Release Date
SBIPS2010-000199/Microsoft Internet Information Services Remote Code Execution VulnerabilitySBIPS0000112011 Jan 21 
 
Alert History
 

Version 2, July 6, 2010, 8:24 AM: Proof-of-concept code that exploits the Microsoft Internet Information Services authentication bypass vulnerability is publicly available.

Version 1, July 2, 2010, 3:20 PM: Microsoft Internet Information Services when running on Windows XP contains a vulnerability that could allow an unauthenticated, remote attacker to bypass authentication and gain unauthorized access.  Updates are not available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Internet Information Services (IIS) 5.1 Base

Associated Products:
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional x64 (AMD/EM64T) Base, SP2




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