Microsoft Windows Services for UNIX Local Privilege Escalation Vulnerability



Date Discovered

September 11, 2007


Microsoft Windows Services for UNIX is prone to a local privilege-escalation vulnerability. Attackers may exploit this issue to gain elevated privileges on affected computers. This facilitates the complete compromise of vulnerable computers. Microsoft Windows Services for UNIX 3.0 and 3.5 and Microsoft Subsystem for UNIX-based Applications are vulnerable to this issue.

Technologies Affected

  • Microsoft Services for Unix 3.0
  • Microsoft Services for Unix 3.5
  • Microsoft Subsystem for UNIX-based Applications


Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.
To reduce the likelihood of attacks, allow access to trusted individuals only and implement restricted environments and privileges.

Microsoft has released an advisory along with fixes to address this issue. Please see the references for more information.



Brian A. Reiter of WolfeReiter is credited with assisting the vendor with resolving this issue. The initial discoverer of this issue is currently unknown.

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