Title: Digital Unix MSGCHK Buffer Overflow Vulnerability
Severity: HIGH
Description:
A problem has been discovered in versions of Digital Unix (4.0D-4.0G) that could allow a local user to gain elevated privileges. The vulnerability could result in complete system compromise.
The problem is due to a buffer overflow in msgchk, a component of the message handling system used to check for messages in all known mail drops for a given user.
If mshcgk is invoked at the command line, accompanied by a string of approximately 8000 bytes, a buffer overflow occurs, allowing the user to overwrite stack variables, including the return address.
Because the msgchk program runs setuid root, this makes it possible for a local user to gain administrative access to the vulnerable system.
Affected Products:
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 D
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 e
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 f
- Digital (Compaq) TRU64/DIGITAL UNIX 4.0.0 g
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