Technical Information

Brief overview of the risk:
This security update resolves a privately reported vulnerability in Active Directory directory service, Active Directory Application Mode (ADAM), and Active Directory Lightweight Directory Service (AD LDS). The vulnerability could allow denial of service if stack space was exhausted during execution of certain types of LDAP or LDAPS requests.
Detailed Information on the risk:

A denial of service vulnerability exists in implementations of Active Directory on Microsoft Windows 2000 Server, Windows Server 2003, and Windows Server 2008. The vulnerability also exists in implementations of Active Directory Application Mode (ADAM) when installed on Windows XP and Windows Server 2003, and Active Directory Lightweight Directory Service (AD LDS) on Windows Server 2008. The vulnerability is due to stack space exhaustion during execution of certain types of LDAP or LDAPS requests. An attacker who successfully exploited this vulnerability could cause the affected system to stop responding.

Further information on this exploit is available at : MS09-066