Title: SCO OpenServer lpshut Buffer Overflow Vulnerability
Severity: MODERATE
Description:
SCO OpenServer 5.0.6 (and possibly earlier versions) ships with several suid bin executables used in printer administration and related tasks.
This includes lpshut, a component used to shut down the LP print service.
The 'lpshut' utility contains a locally exploitable buffer overflow condition due to unsafe memory copy operations involving user-supplied command arguments.
As a result, by submitting excessive input (at least 6240 characters) to lpshut through the command line, it is possible for a local attacker to trigger a buffer overflow. This can cause excess data copied onto the stack to overwrite critical parts of the stack frame such as the calling function's return address.
Since this data is supplied by the user it can be made to alter the program's flow of execution. If properly exploited, this can yield userid 'bin' privileges to the attacker.
Affected Products:
- SCO Open Server 5.0.6
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