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Vulnerability Alert

Microsoft Active Directory LDAP Request Processing Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:19308
Version:1
First Published:2009 November 10 19:29 GMT
Last Published:2009 November 10 19:29 GMT
Port: 3268, 3269, 389, 636
CVE:CVE-2009-1928
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.8
 
Version Summary:

Microsoft Windows contains a vulnerability in the Active Directory component that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are available.

 
 
Description

Microsoft Windows contains a vulnerability in the Active Directory component that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability exists due to errors in processing malformed Lightweight Directory Access Protocol (LDAP) or LDAP over SSL (LDAPS) requests.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious LDAP request to the vulnerable system.  If successful, the attacker could cause Active Directory services to stop responding, resulting in a DoS condition.

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

 
Warning Indicators

The following Microsoft systems are vulnerable when running Active Directory:

  • Windows 2000 SP4 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 Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior

The following Microsoft systems are vulnerable when running Active Directory Application Mode:

  • Windows XP SP3 and SP2
  • Windows XP Professional x64 Edition SP2
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
 
IntelliShield Analysis

Active Directory systems often do not require authentication prior to accepting LDAP requests.  However, an attacker may require access to trusted, internal networks in order to send a malicious LDAP request to a vulnerable system.

An exploit could allow the attacker to cause Active Directory to stop responding to requests.  Client systems that depend on Active Directory services may be unable to access network resources as the result of a DoS condition.

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

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-066

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause Active Directory services to stop responding, resulting in a DoS condition.

 
Technical Information

This vulnerability exists due to errors in processing malformed LDAP or LDAPS requests.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious request to the target system.  The processing of malicious requests by the Local Security Authority Subsystem Service could exhaust available space in the memory stack.  The stack exhaustion could cause Active Directory to become unresponsive, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the available software updates.

Administrators are advised to restrict network access to affected systems.

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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
21980/0Microsoft Active Directory Denial Of ServiceS4472009 Nov 10 
21980/1Microsoft Active Directory Denial Of ServiceS6922013 Jan 30 
 
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 | 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 | 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 XP Home Edition SP2, SP3 | Professional Edition SP2, SP3 | Professional x64 (AMD/EM64T) SP2

Associated Products:
N/A




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