[SA21436] Heimdal setuid Security Issue

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TITLE:
Heimdal setuid Security Issue

SECUNIA ADVISORY ID:
SA21436

VERIFY ADVISORY:
http://secunia.com/advisories/21436/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
Heimdal 0.5.x
http://secunia.com/product/3298/
Heimdal 0.6.x
http://secunia.com/product/3299/
Heimdal 0.7.x
http://secunia.com/product/7707/

DESCRIPTION:
A security issue has been reported in Heimdal, which potentially can
be exploited by malicious, local users to perform certain actions
with escalated privileges.

The security issue is caused due to missing checks for whether the
"setuid()" call has succeeded in the bundled rcp application. This
may be exploited to perform certain actions with root privileges if
the "setuid()" call fails due to e.g. resource limits.

NOTE: This is currently only known to affect the Linux and AIX
operating systems.

Successful exploitation requires that "rcp" is installed setuid root
(not installed by default).

It has also been reported that similar missing checks exists for the
"seteuid()" call in some bundled applications. However, this is
currently not known to affect any operating systems.

The security issue has been reported in version 0.7.2. Prior versions
may also be affected.

SOLUTION:
Apply patch for version 0.7.2:
ftp://ftp.pdc.kth.se/pub/heimdal/src/heimdal-0.7.2-setuid-patch.txt

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:

• Tom Yu, MIT
• Michael Calmer and Marcus Meissner, SUSE

ORIGINAL ADVISORY:
http://www.pdc.kth.se/heimdal/advisory/2006-08-08/

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