Vulnerability Alert

Microsoft Windows Telnet Credential Reflection Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18763
Version:1
First Published:2009 August 11 18:31 GMT
Last Published:2009 August 11 18:31 GMT
Port: Not available
CVE:CVE-2009-1930
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
 
Version Summary:

Microsoft Windows contains a vulnerability in the Telnet service that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.  Updates are available.

 
 
Description

Microsoft Windows contains a vulnerability in the Telnet service that could allow an unauthenticated, remote attacker to execute arbitrary code.

This vulnerability exists due to insufficient protections on credential reuse attacks.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to connect to a malicious Telnet server.  If successful, the attacker could execute arbitrary code with the privileges of the user.

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

 
Warning Indicators

The following Microsoft systems are affected:

  • Windows 2000 SP4 and prior
  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Server 2003 for Itanium-based Systems SP2 and prior
  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows Server 2008 for Itanium-based Systems SP2 and prior
 
IntelliShield Analysis

Attackers cannot directly exploit this vulnerability and instead rely upon user participation in order to accomplish an exploit.  A user must first visit a malicious Telnet server.  An attacker may provide links within e-mail messages designed to open a Telnet session to a malicious host.  If successful, the attacker could replay the user's credentials against the vulnerable system, allowing the attacker to execute arbitrary code with the privileges of the user.

In addition to release patches, Microsoft has also released updates for Windows 7; however, this software is still in beta and not recommended for production use.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the August 2009 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 August 2009

The update available from Microsoft corrects this vulnerability by implementing proper credential protections.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-042

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user.  If that user holds elevated privileges, the attacker could execute code resulting in complete system compromise.

 
Technical Information

This vulnerability exists due to insufficient protections on credential reuse attacks.  The Telnet protocol does not use NTLM credential-reflection protections.  As a result, an unauthenticated, remote attacker could attempt to reuse a user's credentials against the vulnerable system by convincing a user to visit a malicious Telnet server.  If successful, the attacker could execute arbitrary code on the user's system with the privileges of the user.

 
Safeguards

Administrators are advised to apply the available software updates.

Administrators are advised not to connect to unknown systems using Telnet.

Administrators are advised to monitor critical systems.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

 
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.

 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Windows 2000 Advanced Server Base, SP1, SP2, SP3, SP4 | Professional Base, SP1, SP2, SP3, SP4 | Server Base, SP1, SP2, SP3, SP4
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP1, SP2 | Web Edition Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2
Microsoft, Inc.Windows Vista Home Basic Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Business Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional x64 (AMD/EM64T) Base, SP2

Associated Products:
N/A




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