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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: pam security update
Advisory ID:       RHSA-2015:1640-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1640.html
Issue date:        2015-08-18
CVE Names:         CVE-2015-3238 
=====================================================================

1. Summary:

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

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.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1228571 - CVE-2015-3238 pam: DoS/user enumeration due to blocking pipe in pam_unix module

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
pam-1.1.1-20.el6_7.1.src.rpm

i386:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm

x86_64:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-1.1.1-20.el6_7.1.x86_64.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm

x86_64:
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.x86_64.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
pam-1.1.1-20.el6_7.1.src.rpm

x86_64:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-1.1.1-20.el6_7.1.x86_64.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.x86_64.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
pam-1.1.1-20.el6_7.1.src.rpm

i386:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm

ppc64:
pam-1.1.1-20.el6_7.1.ppc.rpm
pam-1.1.1-20.el6_7.1.ppc64.rpm
pam-debuginfo-1.1.1-20.el6_7.1.ppc.rpm
pam-debuginfo-1.1.1-20.el6_7.1.ppc64.rpm
pam-devel-1.1.1-20.el6_7.1.ppc.rpm
pam-devel-1.1.1-20.el6_7.1.ppc64.rpm

s390x:
pam-1.1.1-20.el6_7.1.s390.rpm
pam-1.1.1-20.el6_7.1.s390x.rpm
pam-debuginfo-1.1.1-20.el6_7.1.s390.rpm
pam-debuginfo-1.1.1-20.el6_7.1.s390x.rpm
pam-devel-1.1.1-20.el6_7.1.s390.rpm
pam-devel-1.1.1-20.el6_7.1.s390x.rpm

x86_64:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-1.1.1-20.el6_7.1.x86_64.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.x86_64.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
pam-1.1.1-20.el6_7.1.src.rpm

i386:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm

x86_64:
pam-1.1.1-20.el6_7.1.i686.rpm
pam-1.1.1-20.el6_7.1.x86_64.rpm
pam-debuginfo-1.1.1-20.el6_7.1.i686.rpm
pam-debuginfo-1.1.1-20.el6_7.1.x86_64.rpm
pam-devel-1.1.1-20.el6_7.1.i686.rpm
pam-devel-1.1.1-20.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
pam-1.1.8-12.el7_1.1.src.rpm

x86_64:
pam-1.1.8-12.el7_1.1.i686.rpm
pam-1.1.8-12.el7_1.1.x86_64.rpm
pam-debuginfo-1.1.8-12.el7_1.1.i686.rpm
pam-debuginfo-1.1.8-12.el7_1.1.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
pam-debuginfo-1.1.8-12.el7_1.1.i686.rpm
pam-debuginfo-1.1.8-12.el7_1.1.x86_64.rpm
pam-devel-1.1.8-12.el7_1.1.i686.rpm
pam-devel-1.1.8-12.el7_1.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
pam-1.1.8-12.el7_1.1.src.rpm

x86_64:
pam-1.1.8-12.el7_1.1.i686.rpm
pam-1.1.8-12.el7_1.1.x86_64.rpm
pam-debuginfo-1.1.8-12.el7_1.1.i686.rpm
pam-debuginfo-1.1.8-12.el7_1.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
pam-debuginfo-1.1.8-12.el7_1.1.i686.rpm
pam-debuginfo-1.1.8-12.el7_1.1.x86_64.rpm
pam-devel-1.1.8-12.el7_1.1.i686.rpm
pam-devel-1.1.8-12.el7_1.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
pam-1.1.8-12.el7_1.1.src.rpm

ppc64:
pam-1.1.8-12.el7_1.1.ppc.rpm
pam-1.1.8-12.el7_1.1.ppc64.rpm
pam-debuginfo-1.1.8-12.el7_1.1.ppc.rpm
pam-debuginfo-1.1.8-12.el7_1.1.ppc64.rpm
pam-devel-1.1.8-12.el7_1.1.ppc.rpm
pam-devel-1.1.8-12.el7_1.1.ppc64.rpm

s390x:
pam-1.1.8-12.el7_1.1.s390.rpm
pam-1.1.8-12.el7_1.1.s390x.rpm
pam-debuginfo-1.1.8-12.el7_1.1.s390.rpm
pam-debuginfo-1.1.8-12.el7_1.1.s390x.rpm
pam-devel-1.1.8-12.el7_1.1.s390.rpm
pam-devel-1.1.8-12.el7_1.1.s390x.rpm

x86_64:
pam-1.1.8-12.el7_1.1.i686.rpm
pam-1.1.8-12.el7_1.1.x86_64.rpm
pam-debuginfo-1.1.8-12.el7_1.1.i686.rpm
pam-debuginfo-1.1.8-12.el7_1.1.x86_64.rpm
pam-devel-1.1.8-12.el7_1.1.i686.rpm
pam-devel-1.1.8-12.el7_1.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
pam-1.1.8-12.ael7b_1.1.src.rpm

ppc64le:
pam-1.1.8-12.ael7b_1.1.ppc64le.rpm
pam-debuginfo-1.1.8-12.ael7b_1.1.ppc64le.rpm
pam-devel-1.1.8-12.ael7b_1.1.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
pam-1.1.8-12.el7_1.1.src.rpm

x86_64:
pam-1.1.8-12.el7_1.1.i686.rpm
pam-1.1.8-12.el7_1.1.x86_64.rpm
pam-debuginfo-1.1.8-12.el7_1.1.i686.rpm
pam-debuginfo-1.1.8-12.el7_1.1.x86_64.rpm
pam-devel-1.1.8-12.el7_1.1.i686.rpm
pam-devel-1.1.8-12.el7_1.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3238
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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