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Red Hat RHSA-2012:1098-01 Moderate: Glibc Security Update

red hat
Calendar Grey July 18, 2012
Dist Redhat Esm H88
Ubuntu issues a timely security notice regarding libxml2 patches addressing vulnerabilities and glitches for Kernel 5.
Updated glibc packages that fix three security issues and one bug are now available for Red Hat Enterprise Linux 6

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/articles/11258

Summary

The glibc packages provide the standard C and standard math libraries used by multiple programs on the system. Without these libraries, the Linux system cannot function properly.
Multiple errors in glibc's formatted printing functionality could allow an attacker to bypass FORTIFY_SOURCE protections and execute arbitrary code using a format string flaw in an application, even though these protections are expected to limit the impact of such flaws to an application abort. (CVE-2012-3404, CVE-2012-3405, CVE-2012-3406)
This update also fixes the following bug:
* A programming error caused an internal array of nameservers to be only partially initialized when the /etc/resolv.conf file contained IPv6 nameservers. Depending on the contents of a nearby structure, this could cause certain applications to terminate unexpectedly with a segmentation fault. The programming error has been fixed, which restores proper behavior with IPv6 nameservers listed in the /etc/resolv.conf file. (BZ#837026)
All users of glibc are advised to upgrade to these updated packages, which contain backported patches to fix these issues.

Topics%20covered

Topics Covered

security advisory moderate security issue Red Hat software update bug fix glibc

References

https://access.redhat.com/security/cve/CVE-2012-3404 https://access.redhat.com/security/cve/CVE-2012-3405 https://access.redhat.com/security/cve/CVE-2012-3406 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: glibc-2.12-1.80.el6_3.3.i686.rpm glibc-common-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-common-2.12-1.80.el6_3.3.i686.rpm glibc-devel-2.12-1.80.el6_3.3.i686.rpm glibc-headers-2.12-1.80.el6_3.3.i686.rpm glibc-utils-2.12-1.80.el6_3.3.i686.rpm nscd-2.12-1.80.el6_3.3.i686.rpm
x86_64: glibc-2.12-1.80.el6_3.3.i686.rpm glibc-2.12-1.80.el6_3.3.x86_64.rpm glibc-common-2.12-1.80.el6_3.3.x86_64.rpm glibc-debuginfo-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-2.12-1.80.el6_3.3.x86_64.rpm glibc-debuginfo-common-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-common-2.12-1.80.el6_3.3.x86_64.rpm glibc-devel-2.12-1.80.el6_3.3.i686.rpm glibc-devel-2.12-1.80.el6_3.3.x86_64.rpm glibc-headers-2.12-1.80.el6_3.3.x86_64.rpm glibc-utils-2.12-1.80.el6_3.3.x86_64.rpm nscd-2.12-1.80.el6_3.3.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386: glibc-debuginfo-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-common-2.12-1.80.el6_3.3.i686.rpm glibc-static-2.12-1.80.el6_3.3.i686.rpm
x86_64: glibc-debuginfo-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-2.12-1.80.el6_3.3.x86_64.rpm glibc-debuginfo-common-2.12-1.80.el6_3.3.i686.rpm glibc-debuginfo-common-2.12-1.80.el6_3.3.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2012:1098-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:1098.html
Issue date: 2012-07-18

Topic

Updated glibc packages that fix three security issues and one bug are nowavailable for Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate security issue Red Hat software update bug fix glibc

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 Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

Bugs Fixed

826943 - CVE-2012-3406 glibc: printf() unbound alloca() usage in case of positional parameters + many format specs

833703 - CVE-2012-3404 glibc: incorrect size calculation in formatted printing can lead to FORTIFY_SOURCE format string protection bypass

833704 - CVE-2012-3405 glibc: incorrect use of extend_alloca() in formatted printing can lead to FORTIFY_SOURCE format string protection bypass

837026 - libresolv dumps core when IPv6 address in resolv.conf

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