[RHSA-2013:0521-02] Moderate: pam security, bug fix, and enhancement update

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Red Hat Security Advisory

 

Synopsis: Moderate: pam security, bug fix, and enhancement update

Advisory ID: RHSA-2013:0521-02

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0521.html

Issue date: 2013-02-21

CVE Names: CVE-2011-3148 CVE-2011-3149

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1. Summary:

 

Updated pam packages that fix two security issues, several bugs, and add

various enhancements are now available for Red Hat Enterprise Linux 6.

 

The Red Hat Security Response Team has rated this update as having moderate

security impact. Common Vulnerability Scoring System (CVSS) base scores,

which give detailed severity ratings, are available for each vulnerability

from the CVE links in the References section.

 

2. Relevant releases/architectures:

 

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 Workstation (v. 6) - i386, 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.

 

A stack-based buffer overflow flaw was found in the way the pam_env module

parsed users' "~/.pam_environment" files. If an application's PAM

configuration contained "user_readenv=1" (this is not the default), a

local attacker could use this flaw to crash the application or, possibly,

escalate their privileges. (CVE-2011-3148)

 

A denial of service flaw was found in the way the pam_env module expanded

certain environment variables. If an application's PAM configuration

contained "user_readenv=1" (this is not the default), a local attacker

could use this flaw to cause the application to enter an infinite loop.

(CVE-2011-3149)

 

Red Hat would like to thank Kees Cook of the Google ChromeOS Team for

reporting the CVE-2011-3148 and CVE-2011-3149 issues.

 

These updated pam packages include numerous bug fixes and enhancements.

Space precludes documenting all of these changes in this advisory. Users

are directed to the Red Hat Enterprise Linux 6.4 Technical Notes, linked

to in the References, for information on the most significant of these

changes.

 

All pam users are advised to upgrade to these updated packages, which

contain backported patches to correct these issues and add these

enhancements.

 

4. Solution:

 

Before applying this update, make sure all previously-released errata

relevant to your system have been applied.

 

This update is available via the Red Hat Network. Details on how to

use the Red Hat Network to apply this update are available at

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

 

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

 

588893 - pam does not enforce password complexity restrictions on root

673398 - request for additional pam_cracklib checks

723297 - limits.conf should mention limits.d directory

746619 - CVE-2011-3148 pam (pam_env): Stack-based buffer overflow by parsing user's pam_environment file

746620 - CVE-2011-3149 pam (pam_env): Infinite loop by expanding certain arguments

750601 - pam_namespace cannot verify status of SELinux in MLS

811168 - fix pam_get_authtok_verify() to respect the authtok_type= option

811243 - pam_cracklib: difignore is no-op in the current package - needs man page update

815516 - pam remember can check wrong username if it is a substring of another username

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/pam-1.1.1-13.el6.src.rpm

 

i386:

pam-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

 

x86_64:

pam-1.1.1-13.el6.i686.rpm

pam-1.1.1-13.el6.x86_64.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.x86_64.rpm

 

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

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/pam-1.1.1-13.el6.src.rpm

 

i386:

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.i686.rpm

 

x86_64:

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.x86_64.rpm

pam-devel-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.x86_64.rpm

 

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

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/pam-1.1.1-13.el6.src.rpm

 

x86_64:

pam-1.1.1-13.el6.i686.rpm

pam-1.1.1-13.el6.x86_64.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.x86_64.rpm

 

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

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/pam-1.1.1-13.el6.src.rpm

 

x86_64:

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.x86_64.rpm

pam-devel-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/pam-1.1.1-13.el6.src.rpm

 

i386:

pam-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.i686.rpm

 

ppc64:

pam-1.1.1-13.el6.ppc.rpm

pam-1.1.1-13.el6.ppc64.rpm

pam-debuginfo-1.1.1-13.el6.ppc.rpm

pam-debuginfo-1.1.1-13.el6.ppc64.rpm

pam-devel-1.1.1-13.el6.ppc.rpm

pam-devel-1.1.1-13.el6.ppc64.rpm

 

s390x:

pam-1.1.1-13.el6.s390.rpm

pam-1.1.1-13.el6.s390x.rpm

pam-debuginfo-1.1.1-13.el6.s390.rpm

pam-debuginfo-1.1.1-13.el6.s390x.rpm

pam-devel-1.1.1-13.el6.s390.rpm

pam-devel-1.1.1-13.el6.s390x.rpm

 

x86_64:

pam-1.1.1-13.el6.i686.rpm

pam-1.1.1-13.el6.x86_64.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.x86_64.rpm

pam-devel-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/pam-1.1.1-13.el6.src.rpm

 

i386:

pam-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.i686.rpm

 

x86_64:

pam-1.1.1-13.el6.i686.rpm

pam-1.1.1-13.el6.x86_64.rpm

pam-debuginfo-1.1.1-13.el6.i686.rpm

pam-debuginfo-1.1.1-13.el6.x86_64.rpm

pam-devel-1.1.1-13.el6.i686.rpm

pam-devel-1.1.1-13.el6.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/#package

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2011-3148.html

https://www.redhat.com/security/data/cve/CVE-2011-3149.html

https://access.redhat.com/security/updates/classification/#moderate

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.4_Technical_Notes/pam.html

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2013 Red Hat, Inc.

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