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TITLE:
pam-per-user Cached PAM "subrequest" Vulnerability

SECUNIA ADVISORY ID:
SA16781

VERIFY ADVISORY:
http://secunia.com/advisories/16781/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
PAM Module for Per-User Authentication Mechanisms (pam-per-user) 0.x
http://secunia.com/product/5693/

DESCRIPTION:
A vulnerability has been reported in pam-per-user, which can be
exploited by malicious users to bypass certain security
restrictions.

The vulnerability is caused due an error in checking whether the user
name has been changed between calls to the authentication function.
This causes pam-per-user to incorrectly use the same cached PAM
"subrequest" handle between authentication calls.

Successful exploitation allows a malicious user to authenticate as
other users (e.g. via /bin/login) using his own credentials.

SOLUTION:
Update to version 0.4.
ftp://ftp.feep.net/pub/software/PAM/pam_per_user/pam_per_user-0.4.tar.gz

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Vijay Tandeker.

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About:
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vulnerabilities.

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