[SA21436] Heimdal setuid Security Issue

Type securityvulns
Reporter Securityvulns
Modified 2006-08-10T00:00:00


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TITLE: Heimdal setuid Security Issue


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/

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

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