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TITLE:
Kerberos V5 setuid Security Issue

SECUNIA ADVISORY ID:
SA21402

VERIFY ADVISORY:
http://secunia.com/advisories/21402/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
Kerberos V5
http://secunia.com/product/556/

DESCRIPTION:
A security issue has been reported in Kerberos, 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 krshd and v4rcp
applications. This can be exploited to disclose or manipulate the
contents of arbitrary files or execute arbitrary code 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.

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 versions 1.5 and prior.

SOLUTION:
Apply patches.

Kerberos V5 1.5:
http://web.mit.edu/kerberos/advisories/2006-001-patch_1.5.txt

Kerberos V5 1.4.3:
http://web.mit.edu/kerberos/advisories/2006-001-patch_1.4.3.txt

Fixes will also be included in the upcoming 1.5.1 and 1.4.4 versions.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Michael Calmer and Marcus Meissner, SUSE.

ORIGINAL ADVISORY:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2006-001-setuid.txt

OTHER REFERENCES:
US-CERT VU#580124:
http://www.kb.cert.org/vuls/id/580124

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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