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Red Hat Enterprise Linux: RHSA-2015-1640 Moderate: PAM DoS Threat

red hat
Calendar Grey August 18, 2015
Dist Redhat Esm H88
An updated pam module is now available for Red Hat Enterprise Linux, rectifying a significant vulnerability in user authentication.
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 Red Hat Enterprise Linux authentication Denial of Service pam CVE-2015-3238

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 Red Hat Enterprise Linux authentication Denial of Service pam CVE-2015-3238

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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