Red Hat Security Advisory: glibc security and bug fix update Security Advisory secalert@redhat.com Red Hat Security Response Team RHSA-2012:1098 Final 1 1 2012-07-18T15:04:00Z Current version 2012-07-18T15:05:00Z 2012-07-18T15:04:00Z Red Hat rhsa-to-cvrf 1.0.1484 2012-07-18T15:24:02Z Updated glibc packages that fix three security issues and one bug 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. 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. Please see https://www.redhat.com/footer/terms-of-use.html Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate https://rhn.redhat.com/errata/RHSA-2012-1098.html https://rhn.redhat.com/errata/RHSA-2012-1098.html https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/updates/classification/#moderate https://bugzilla.redhat.com/show_bug.cgi?id=837026 https://bugzilla.redhat.com/show_bug.cgi?id=837026 Red Hat Enterprise Linux HPC Node Optional (v. 6) Red Hat Enterprise Linux Server (v. 6) Red Hat Enterprise Linux Workstation (v. 6) Red Hat Enterprise Linux Desktop Optional (v. 6) Red Hat Enterprise Linux Workstation Optional (v. 6) Red Hat Enterprise Linux HPC Node (v. 6) Red Hat Enterprise Linux Desktop (v. 6) Red Hat Enterprise Linux Server Optional (v. 6) glibc-2.12-1.80.el6_3.3.src.rpm glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux HPC Node Optional (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux Server (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux Workstation (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux Desktop Optional (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux Workstation Optional (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux HPC Node (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux Desktop (v. 6) glibc-2.12-1.80.el6_3.3 as a component of Red Hat Enterprise Linux Server Optional (v. 6) 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. 2012-05-11T00:00:00Z 2012-07-11T00:00:00Z CVE-2012-3404 6Client-6.3.z:glibc-2.12-1.80.el6_3.3 6Client-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6ComputeNode-6.3.z:glibc-2.12-1.80.el6_3.3 6ComputeNode-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6Server-6.3.z:glibc-2.12-1.80.el6_3.3 6Server-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6Workstation-6.3.z:glibc-2.12-1.80.el6_3.3 6Workstation-optional-6.3.z:glibc-2.12-1.80.el6_3.3 Moderate 6.8 AV:N/AC:M/AU:N/C:P/I:P/A:P 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 https://rhn.redhat.com/errata/RHSA-2012-1098.html https://www.redhat.com/security/data/cve/CVE-2012-3404.html CVE-2012-3404 https://bugzilla.redhat.com/show_bug.cgi?id=833703 bz#833703: CVE-2012-3404 glibc: incorrect size calculation in formatted printing can lead to FORTIFY_SOURCE format string protection bypass 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. 2012-05-11T00:00:00Z 2012-07-11T00:00:00Z CVE-2012-3405 6Client-6.3.z:glibc-2.12-1.80.el6_3.3 6Client-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6ComputeNode-6.3.z:glibc-2.12-1.80.el6_3.3 6ComputeNode-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6Server-6.3.z:glibc-2.12-1.80.el6_3.3 6Server-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6Workstation-6.3.z:glibc-2.12-1.80.el6_3.3 6Workstation-optional-6.3.z:glibc-2.12-1.80.el6_3.3 Moderate 6.8 AV:N/AC:M/AU:N/C:P/I:P/A:P 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 https://rhn.redhat.com/errata/RHSA-2012-1098.html https://www.redhat.com/security/data/cve/CVE-2012-3405.html CVE-2012-3405 https://bugzilla.redhat.com/show_bug.cgi?id=833704 bz#833704: CVE-2012-3405 glibc: incorrect use of extend_alloca() in formatted printing can lead to FORTIFY_SOURCE format string protection bypass 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. 2012-05-11T00:00:00Z 2012-07-11T00:00:00Z CVE-2012-3406 6Client-6.3.z:glibc-2.12-1.80.el6_3.3 6Client-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6ComputeNode-6.3.z:glibc-2.12-1.80.el6_3.3 6ComputeNode-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6Server-6.3.z:glibc-2.12-1.80.el6_3.3 6Server-optional-6.3.z:glibc-2.12-1.80.el6_3.3 6Workstation-6.3.z:glibc-2.12-1.80.el6_3.3 6Workstation-optional-6.3.z:glibc-2.12-1.80.el6_3.3 Moderate 6.8 AV:N/AC:M/AU:N/C:P/I:P/A:P 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 https://rhn.redhat.com/errata/RHSA-2012-1098.html https://www.redhat.com/security/data/cve/CVE-2012-3406.html CVE-2012-3406 https://bugzilla.redhat.com/show_bug.cgi?id=826943 bz#826943: CVE-2012-3406 glibc: printf() unbound alloca() usage in case of positional parameters + many format specs