SRT Security Advisory (SRT2002-06-04-1711): SCO crontab

[zillion <zillion () snosoft com>]

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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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