Microsoft Active Directory CVE-2011-3406 Buffer Overflow Vulnerability

Description

Microsoft Active Directory is prone to a buffer-overflow vulnerability. Successful exploits can allow attackers to execute arbitrary code with Network Service privileges. Failed exploit attempts may result in a denial-of-service condition.

Technologies Affected

• Avaya Aura Conferencing 6.0 Standard
• Avaya CallPilot 4.0
• Avaya CallPilot 5.0
• Avaya Communication Server 1000 Telephony Manager 3.0
• Avaya Communication Server 1000 Telephony Manager 4.0
• Avaya Meeting Exchange - Client Registration Server
• Avaya Meeting Exchange - Recording Server
• Avaya Meeting Exchange - Streaming Server
• Avaya Meeting Exchange - Web Conferencing Server
• Avaya Meeting Exchange - Webportal
• Avaya Meeting Exchange 5.0
• Avaya Meeting Exchange 5.0 SP1
• Avaya Meeting Exchange 5.0 SP2
• Avaya Meeting Exchange 5.0.0.0.52
• Avaya Meeting Exchange 5.1
• Avaya Meeting Exchange 5.1 SP1
• Avaya Meeting Exchange 5.2
• Avaya Meeting Exchange 5.2 SP1
• Avaya Meeting Exchange 5.2 SP2
• Avaya Messaging Application Server 4
• Avaya Messaging Application Server 5
• Avaya Messaging Application Server 5.2
• Microsoft Active Directory
• Microsoft Active Directory Application Mode (ADAM)
• Microsoft Active Directory Lightweight Directory Service
• Microsoft Windows 7 for 32-bit Systems
• Microsoft Windows 7 for 32-bit Systems SP1
• Microsoft Windows 7 for x64-based Systems
• Microsoft Windows 7 for x64-based Systems SP1
• Microsoft Windows Server 2003 Itanium SP2
• Microsoft Windows Server 2003 SP1
• Microsoft Windows Server 2003 SP2
• Microsoft Windows Server 2003 Sp1 X64
• Microsoft Windows Server 2003 Sp2 X64
• Microsoft Windows Server 2008 R2 for x64-based Systems SP1
• Microsoft Windows Server 2008 for 32-bit Systems
• Microsoft Windows Server 2008 for 32-bit Systems SP2
• Microsoft Windows Server 2008 for x64-based Systems
• Microsoft Windows Server 2008 for x64-based Systems R2
• Microsoft Windows Server 2008 for x64-based Systems SP2
• Microsoft Windows Vista Business 64-bit edition SP1
• Microsoft Windows Vista Business SP1
• Microsoft Windows Vista SP2
• Microsoft Windows XP
• Microsoft Windows XP Professional x64 Edition
• Microsoft Windows XP Professional x64 Edition SP2
• Microsoft Windows XP Service Pack 3

Recommendations

Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer and resources at the network boundary if global access isn’t needed. Consider blocking incoming and outgoing traffic to TCP port 389. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review all applicable logs regularly.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Permit privileged access for trusted individuals only.
Permitting privileged access to known and trusted individuals only may reduce exposure to this and other latent vulnerabilities.

Implement multiple redundant layers of security.
Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.

The vendor has released an advisory and updates. Please see the references for details.