Damian Saura

The issue arises from improper validation of certain parameters to hooked System Service Descriptor Table (SSDT) functions. This can be exploited by local users to cause a denial of service, resulting in a system crash. The exploitation vectors include a crafted `OBJECT ATTRIBUTES` structure in a call to the `NtDeleteFile` function, leading to improper validation of a `ZwQueryObject` result, as well as unspecified calls to the `NtCreateFile` and `NtSetThreadContext` functions.

Name of the Vulnerable Software and Affected Versions: Windows 2000 versions prior to SP4 Description: The issue is related to a stack-based buffer overflow in Active Directory, allowing remote attackers to cause a denial of service, potentially leading to a system reboot, and possibly execute arbitrary code. This can be achieved by sending an LDAP version 3 search request with a large number of specific statements, such as `AND` and `OR`, which causes the LSASS.EXE process to crash. Recommendations: For Windows 2000 versions prior to SP4, apply Service Pack 4 to resolve the issue.