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Red Hat: RHSA-2015:1640-01 Moderate: pam DoS Threat Update

red hat
Calendar Grey August 18, 2015
Dist Redhat Esm H88
Important security patch released for Red Hat's pam module to fix significant DoS vulnerability. Users are recommended to upgrade immediately.
An updated pam package that fixes one security issue is now available for Red Hat Enterprise Linux 6 and 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat DoS pam

References

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

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

Read the Full Advisory


Advisory ID: RHSA-2015:1640-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:1640.html
Issue date: 2015-08-18

Topic

An updated pam package that fixes one security issue is now available forRed Hat Enterprise Linux 6 and 7.Red Hat Product Security has rated this update as having Moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat DoS pam

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

Bugs Fixed

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

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