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Strategic Reconnaissance Team Security Advisory (SRT2002-06-04-1611)
Topic : SCO OpenServer crontab format string vulnerability
Date : June 04, 2002
Credit : KF dotslash[at]snosoft.com
Site : http://www.snosoft.com
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.: Description:
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The SCO OpenServer crontab application is installed setgid cron and
can be used to schedule execution of programs and scripts.
This implementation of crontab contains a format string vulnerability
which can be used to execute code in order to elevate privileges:
$ crontab %x%x%x%x
crontab: cannot open file 8047f08804a5578047cd48047cd4
Due to the nature of crontab it is very likely that ones 'cron' group
privileges have been obtained it is possible to get higher privileges
.: Impact:
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Local users can elevate their privileges trough this vulnerability.
.: Systems Affected:
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SCO/Caldera OpenServer 5.0.6
.: Solution:
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The vendor was notified and is diligently working on a fix. Until such
a fix has been made available disable crontab or deny access from
untrusted sources to the affected systems.
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Received on Jun 04 2002
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