Articles / Red Hat: Security update fo…

Red Hat: Security update for glibc

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. It was discovered that the formatted printing functionality in glibc did not properly restrict the use of alloca(). This 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.

Updated packages are available from ftp.redhat.com.

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=====================================================================
                  Red Hat Security Advisory

Synopsis:          Moderate: glibc security and bug fix update
Advisory ID:       RHSA-2012:1097-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1097.html
Issue date:        2012-07-18
CVE Names:         CVE-2012-3406 
=====================================================================

1. Summary:

Updated glibc packages that fix one security issue and one bug are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

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.

It was discovered that the formatted printing functionality in glibc did
not properly restrict the use of alloca(). This 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-2012-3406)

This update also fixes the following bug:

* If a file or a string was in the IBM-930 encoding, and contained the
invalid multibyte character "0xffff", attempting to use iconv() (or the
iconv command) to convert that file or string to another encoding, such as
UTF-8, resulted in a segmentation fault. With this update, the conversion
code for the IBM-930 encoding recognizes this invalid character and calls
an error handler, rather than causing a segmentation fault. (BZ#837896)

All users of glibc are advised to upgrade to these updated packages, which
contain backported patches to fix these issues.

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/):

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

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/glibc-2.5-81.el5_8.4.src.rpm

i386:
glibc-2.5-81.el5_8.4.i386.rpm
glibc-2.5-81.el5_8.4.i686.rpm
glibc-common-2.5-81.el5_8.4.i386.rpm
glibc-debuginfo-2.5-81.el5_8.4.i386.rpm
glibc-debuginfo-2.5-81.el5_8.4.i686.rpm
glibc-debuginfo-common-2.5-81.el5_8.4.i386.rpm
glibc-devel-2.5-81.el5_8.4.i386.rpm
glibc-headers-2.5-81.el5_8.4.i386.rpm
glibc-utils-2.5-81.el5_8.4.i386.rpm
nscd-2.5-81.el5_8.4.i386.rpm

x86_64:
glibc-2.5-81.el5_8.4.i686.rpm
glibc-2.5-81.el5_8.4.x86_64.rpm
glibc-common-2.5-81.el5_8.4.x86_64.rpm
glibc-debuginfo-2.5-81.el5_8.4.i386.rpm
glibc-debuginfo-2.5-81.el5_8.4.i686.rpm
glibc-debuginfo-2.5-81.el5_8.4.x86_64.rpm
glibc-debuginfo-common-2.5-81.el5_8.4.i386.rpm
glibc-devel-2.5-81.el5_8.4.i386.rpm
glibc-devel-2.5-81.el5_8.4.x86_64.rpm
glibc-headers-2.5-81.el5_8.4.x86_64.rpm
glibc-utils-2.5-81.el5_8.4.x86_64.rpm
nscd-2.5-81.el5_8.4.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/glibc-2.5-81.el5_8.4.src.rpm

i386:
glibc-2.5-81.el5_8.4.i386.rpm
glibc-2.5-81.el5_8.4.i686.rpm
glibc-common-2.5-81.el5_8.4.i386.rpm
glibc-debuginfo-2.5-81.el5_8.4.i386.rpm
glibc-debuginfo-2.5-81.el5_8.4.i686.rpm
glibc-debuginfo-common-2.5-81.el5_8.4.i386.rpm
glibc-devel-2.5-81.el5_8.4.i386.rpm
glibc-headers-2.5-81.el5_8.4.i386.rpm
glibc-utils-2.5-81.el5_8.4.i386.rpm
nscd-2.5-81.el5_8.4.i386.rpm

ia64:
glibc-2.5-81.el5_8.4.i686.rpm
glibc-2.5-81.el5_8.4.ia64.rpm
glibc-common-2.5-81.el5_8.4.ia64.rpm
glibc-debuginfo-2.5-81.el5_8.4.i686.rpm
glibc-debuginfo-2.5-81.el5_8.4.ia64.rpm
glibc-devel-2.5-81.el5_8.4.ia64.rpm
glibc-headers-2.5-81.el5_8.4.ia64.rpm
glibc-utils-2.5-81.el5_8.4.ia64.rpm
nscd-2.5-81.el5_8.4.ia64.rpm

ppc:
glibc-2.5-81.el5_8.4.ppc.rpm
glibc-2.5-81.el5_8.4.ppc64.rpm
glibc-common-2.5-81.el5_8.4.ppc.rpm
glibc-debuginfo-2.5-81.el5_8.4.ppc.rpm
glibc-debuginfo-2.5-81.el5_8.4.ppc64.rpm
glibc-devel-2.5-81.el5_8.4.ppc.rpm
glibc-devel-2.5-81.el5_8.4.ppc64.rpm
glibc-headers-2.5-81.el5_8.4.ppc.rpm
glibc-utils-2.5-81.el5_8.4.ppc.rpm
nscd-2.5-81.el5_8.4.ppc.rpm

s390x:
glibc-2.5-81.el5_8.4.s390.rpm
glibc-2.5-81.el5_8.4.s390x.rpm
glibc-common-2.5-81.el5_8.4.s390x.rpm
glibc-debuginfo-2.5-81.el5_8.4.s390.rpm
glibc-debuginfo-2.5-81.el5_8.4.s390x.rpm
glibc-devel-2.5-81.el5_8.4.s390.rpm
glibc-devel-2.5-81.el5_8.4.s390x.rpm
glibc-headers-2.5-81.el5_8.4.s390x.rpm
glibc-utils-2.5-81.el5_8.4.s390x.rpm
nscd-2.5-81.el5_8.4.s390x.rpm

x86_64:
glibc-2.5-81.el5_8.4.i686.rpm
glibc-2.5-81.el5_8.4.x86_64.rpm
glibc-common-2.5-81.el5_8.4.x86_64.rpm
glibc-debuginfo-2.5-81.el5_8.4.i386.rpm
glibc-debuginfo-2.5-81.el5_8.4.i686.rpm
glibc-debuginfo-2.5-81.el5_8.4.x86_64.rpm
glibc-debuginfo-common-2.5-81.el5_8.4.i386.rpm
glibc-devel-2.5-81.el5_8.4.i386.rpm
glibc-devel-2.5-81.el5_8.4.x86_64.rpm
glibc-headers-2.5-81.el5_8.4.x86_64.rpm
glibc-utils-2.5-81.el5_8.4.x86_64.rpm
nscd-2.5-81.el5_8.4.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-2012-3406.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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