From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Jul 06 2006 - 12:47:05 CDT

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Reverse Engineer Wanted

Secunia offers a Security Specialist position with emphasis on
reverse engineering of software and exploit code, auditing of
source code, and analysis of vulnerability reports.

http://secunia.com/secunia_security_specialist/

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TITLE:
ppp setuid Security Issue

SECUNIA ADVISORY ID:
SA20963

VERIFY ADVISORY:
http://secunia.com/advisories/20963/

CRITICAL:
Moderately critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
ppp 2.x
http://secunia.com/product/4174/

DESCRIPTION:
Marcus Meissner discovered a vulnerability in the winbind plugin of
ppp, 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. This can potentially be exploited to
launch the winbind NTLM authentication helper with root privileges,
which may allow the user to perform certain actions as the root
user.

Successful exploitation allows to perform certain actions with
escalated privileges, but requires special PAM and ppp
configurations.

This vulnerability has been reported in version 2.4.3 and 2.4.4b1.
Prior versions may also be affected.

SOLUTION:
Update to version 2.4.4.
ftp://ftp.samba.org/pub/ppp/

PROVIDED AND/OR DISCOVERED BY:
Marcus Meissner

ORIGINAL ADVISORY:
http://www.ubuntu.com/usn/usn-310-1

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