msgchk, a part of the MH mail system, reportedly suffers from a buffer overflow with respect to the name of the inbox to be checked for new mail. This overflow would allow the user of msgchk to execute arbitrary code.
msgchk is the portion of the MH mail system that checks for new mail in the system spool folder. Its optional argument specifies the name of the inbox to be checked. Reportedly, the Tru64 Unix implementation in that an argument of 9000 characters or more will cause a buffer overflow, leading to execution of arbitrary code at the effective user id of the msgchk process.
If msgchk runs without setuid root privileges, there is no vulnerability here. If msgchk runs with setuid privileges, the user may be able to gain elevated privileges.
The CERT/CC is currently unaware of a practical solution to this problem.
Remove setuid privileges from msgchk.
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Affected Unknown __ Unaffected
Notified: October 09, 2001 Updated: September 10, 2002
The vendor has not provided us with any further information regarding this vulnerability.
The CERT/CC has no additional comments at this time.
If you have feedback, comments, or additional information about this vulnerability, please send us email.
Group | Score | Vector
Base | N/A | N/A
Temporal | N/A | N/A
Environmental | | N/A
This vulnerability was first reported by Seung Hyun Seo.
This document was written by Tim Shimeall and Ian A. Finlay.
CVE IDs:* | None
**Severity Metric: | 3.00
*Date Public: | 2001-09-10
Date First Published: | 2001-11-15
Date Last Updated: | 2002-09-10 18:51 UTC
Document Revision: | 10