Oracle Linux 6 / 7 : pam (ELSA-2015-1640)

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

From Red Hat Security Advisory 2015:1640 :

An updated pam package that fixes one security issue is now available
for Red Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Moderate
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link in the References section.

Pluggable Authentication Modules (PAM) provide a system whereby
administrators can set up authentication policies without having to
recompile programs to handle authentication.

It was discovered that the _unix_run_helper_binary() function of PAM's
unix_pam module could write to a blocking pipe, possibly causing the
function to become unresponsive. An attacker able to supply large
passwords to the unix_pam module could use this flaw to enumerate
valid user accounts, or cause a denial of service on the system.
(CVE-2015-3238)

Red Hat would like to thank Sebastien Macke of Trustwave SpiderLabs
for reporting this issue.

All pam users are advised to upgrade to this updated package, which
contains a backported patch to correct this issue.

See also :

https://oss.oracle.com/pipermail/el-errata/2015-August/005351.html
https://oss.oracle.com/pipermail/el-errata/2015-August/005352.html

Solution :

Update the affected pam packages.

Risk factor :

Medium / CVSS Base Score : 5.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:P)
CVSS Temporal Score : 4.8
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 85526 ()

Bugtraq ID:

CVE ID: CVE-2015-3238

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