Intrusion Prevention

MS.Active.Directory.Many.Request.DoS

Description

This indicates an attack attempt against a denial-of-service vulnerability in Microsoft Active Directory.
The vulnerability is caused by an error when the vulnerable software handles a large number of LDAP queries. It allows a remote attacker to cause denial of service via sending a large number of crafted LDAP requests.

Affected Products

Active Directory on Microsoft Windows 2000 Server Service Pack 4
Active Directory Application Mode (ADAM) when installed on Windows XP Professional Service Pack 2 and Windows XP Professional Service Pack 3
Active Directory Application Mode (ADAM) when installed on Windows XP Professional x64 Edition Service Pack 2
Active Directory on Windows Server 2003 Service Pack 2
Active Directory Application Mode (ADAM) when installed on Windows Server 2003 Service Pack 2
Active Directory on Windows Server 2003 x64 Edition Service Pack 2
Active Directory Application Mode (ADAM) when installed on Windows Server 2003 x64 Edition Service Pack 2
Active Directory on Windows Server 2003 with SP2 for Itanium-based Systems

Impact

Denial of service

Recommended Actions

Apply the patch, available from the vendor's web site:
http://www.microsoft.com/technet/security/Bulletin/MS09-018.mspx

CVE References

CVE-2009-1139