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TITLE:
Samba "winbind nss info" Privilege Escalation Security Issue

SECUNIA ADVISORY ID:
SA26764

VERIFY ADVISORY:
http://secunia.com/advisories/26764/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
Samba 3.x
http://secunia.com/product/2999/

DESCRIPTION:
A security issue has been reported in Samba, which can be exploited
by malicious, local users to gain escalated privileges.

The security issue is caused due to Winbind incorrectly assigning a
primary group id of 0 to the queried domain user when "winbind nss
info" is set to "sfu" or "rfc2307". This can be exploited to gain
escalated privileges, but requires that the RFC2307 or SFU (Services
for Unix) primary group attributes are missing.

The security issue is reported in Samba versions from 3.0.25 to
3.0.25c.

SOLUTION:
Update to version 3.0.26.
http://www.samba.org/samba/ftp/stable/samba-3.0.26.tar.gz

Apply vendor patch:
http://samba.org/samba/ftp/patches/security/samba-3.0.25-CVE-2007-4138.patch

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Rick King.

ORIGINAL ADVISORY:
http://samba.org/samba/security/CVE-2007-4138.html

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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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