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  3. Microsoft Virtual PC For Mac Temporary File Privilege Escalation Vulnerability

Microsoft Virtual PC For Mac Temporary File Privilege Escalation Vulnerability

Risk

High

Date Discovered

February 10, 2004

Description

Microsoft has reported an issue in Virtual PC for Mac that may permit a local attacker to gain elevated privileges on a system hosting the software. This is due to insecure handling of temporary files by the setuid root VirtualPC_Services binary, potentially permitting a malicious local user to create a malicious symbolic link in place of the temporary file, which would result in corruption of files or a malicious local user gaining root privileges on the system.

Technologies Affected

  • Microsoft Virtual PC for Mac 6.0
  • Microsoft Virtual PC for Mac 6.0.1
  • Microsoft Virtual PC for Mac 6.0.2
  • Microsoft Virtual PC for Mac 6.1

Recommendations

Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.

This issue could be exploited by a malicious local user. Do not permit untrusted individuals to have local access to systems. Where possible, place local users in restricted environments and shells to limit what actions they may perform.
Microsoft has released MS04-005, which includes updates to address this issue.

Credits

The disclosure of this issue has been credited to George Gal of @stake.
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Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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