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Kerberos V5 setuid Security Issue Advisory Available in Danish 

Secunia Advisory: SA21402  
Release Date: 2006-08-09
Last Update: 2006-08-18

Critical:
Less critical
Impact: Privilege escalation
Where: Local system
Solution Status: Vendor Patch

Software:Kerberos 5.x

CVE reference:CVE-2006-3083 (Secunia mirror)
CVE-2006-3084 (Secunia mirror)

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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. Note that the previous patches (revision 18419 in the diff header) introduced a new bug. Updated patches have been released to correct this problem.

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.

Changelog:
2006-08-16: Added US-CERT reference.
2006-08-18: Added information about updated patches.

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

Other References:
US-CERT VU#401660:
http://www.kb.cert.org/vuls/id/401660

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



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

19 Related Secunia Security Advisories, displaying 10

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4. Kerberos Multiple Vulnerabilities
5. Kerberos kadmind xprt->xp_auth Code Execution Vulnerability
6. Kerberos kadmind "mechglue" Code Execution Vulnerability
7. Kerberos V5 Multiple Vulnerabilities
8. Kerberos V5 Telnet Client Information Disclosure Weakness
9. MIT Kerberos Telnet Client Buffer Overflow Vulnerabilities
10. Kerberos V5 "libkadm5srv" Buffer Overflow Vulnerability

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