AusCERT - ESB-2013.0577 - [Linux][RedHat] glibc: Denial of service

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ESB-2013.0577 - [Linux][RedHat] glibc: Denial of service - Existing account
Date: 26 April 2013

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0577
                  Low: glibc security and bug fix update
                               26 April 2013

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           glibc
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux WS/Desktop 5
                   Red Hat Enterprise Linux Server 5
                   Linux variants
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-1914 CVE-2013-0242 

Original Bulletin: 
   https://rhn.redhat.com/errata/RHSA-2013-0769.html

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Red Hat. It is recommended that administrators
         running glibc check for an updated version of the software for their
         operating system.

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

Synopsis:          Low: glibc security and bug fix update
Advisory ID:       RHSA-2013:0769-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0769.html
Issue date:        2013-04-24
CVE Names:         CVE-2013-0242 CVE-2013-1914 
=====================================================================

1. Summary:

Updated glibc packages that fix two security issues and two bugs are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
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.

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 libraries (libc), POSIX thread
libraries (libpthread), standard math libraries (libm), and the Name Server
Caching Daemon (nscd) used by multiple programs on the system. Without
these libraries, the Linux system cannot function correctly.

It was found that getaddrinfo() did not limit the amount of stack memory
used during name resolution. An attacker able to make an application
resolve an attacker-controlled hostname or IP address could possibly cause
the application to exhaust all stack memory and crash. (CVE-2013-1914)

A flaw was found in the regular expression matching routines that process
multibyte character input. If an application utilized the glibc regular
expression matching mechanism, an attacker could provide specially-crafted
input that, when processed, would cause the application to crash.
(CVE-2013-0242)

This update also fixes the following bugs:

* The improvements RHSA-2012:1207 made to the accuracy of floating point
functions in the math library caused performance regressions for those
functions. The performance regressions were analyzed and a fix was applied
that retains the current accuracy but reduces the performance penalty to
acceptable levels. Refer to Red Hat Knowledge solution 229993, linked
to in the References, for further information. (BZ#950535)

* It was possible that a memory location freed by the localization code
could be accessed immediately after, resulting in a crash. The fix ensures
that the application does not crash by avoiding the invalid memory access.
(BZ#951493)

Users of glibc are advised to upgrade to these updated packages, which
contain backported patches to correct 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/):

905874 - CVE-2013-0242 glibc: Buffer overrun (DoS) in regexp matcher by processing multibyte characters
947882 - CVE-2013-1914 glibc: Stack (frame) overflow in getaddrinfo() when processing entry mapping to long list of address structures

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-2.5-107.el5_9.4.src.rpm

i386:
glibc-2.5-107.el5_9.4.i386.rpm
glibc-2.5-107.el5_9.4.i686.rpm
glibc-common-2.5-107.el5_9.4.i386.rpm
glibc-debuginfo-2.5-107.el5_9.4.i386.rpm
glibc-debuginfo-2.5-107.el5_9.4.i686.rpm
glibc-debuginfo-common-2.5-107.el5_9.4.i386.rpm
glibc-devel-2.5-107.el5_9.4.i386.rpm
glibc-headers-2.5-107.el5_9.4.i386.rpm
glibc-utils-2.5-107.el5_9.4.i386.rpm
nscd-2.5-107.el5_9.4.i386.rpm

x86_64:
glibc-2.5-107.el5_9.4.i686.rpm
glibc-2.5-107.el5_9.4.x86_64.rpm
glibc-common-2.5-107.el5_9.4.x86_64.rpm
glibc-debuginfo-2.5-107.el5_9.4.i386.rpm
glibc-debuginfo-2.5-107.el5_9.4.i686.rpm
glibc-debuginfo-2.5-107.el5_9.4.x86_64.rpm
glibc-debuginfo-common-2.5-107.el5_9.4.i386.rpm
glibc-devel-2.5-107.el5_9.4.i386.rpm
glibc-devel-2.5-107.el5_9.4.x86_64.rpm
glibc-headers-2.5-107.el5_9.4.x86_64.rpm
glibc-utils-2.5-107.el5_9.4.x86_64.rpm
nscd-2.5-107.el5_9.4.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/glibc-2.5-107.el5_9.4.src.rpm

i386:
glibc-2.5-107.el5_9.4.i386.rpm
glibc-2.5-107.el5_9.4.i686.rpm
glibc-common-2.5-107.el5_9.4.i386.rpm
glibc-debuginfo-2.5-107.el5_9.4.i386.rpm
glibc-debuginfo-2.5-107.el5_9.4.i686.rpm
glibc-debuginfo-common-2.5-107.el5_9.4.i386.rpm
glibc-devel-2.5-107.el5_9.4.i386.rpm
glibc-headers-2.5-107.el5_9.4.i386.rpm
glibc-utils-2.5-107.el5_9.4.i386.rpm
nscd-2.5-107.el5_9.4.i386.rpm

ia64:
glibc-2.5-107.el5_9.4.i686.rpm
glibc-2.5-107.el5_9.4.ia64.rpm
glibc-common-2.5-107.el5_9.4.ia64.rpm
glibc-debuginfo-2.5-107.el5_9.4.i686.rpm
glibc-debuginfo-2.5-107.el5_9.4.ia64.rpm
glibc-devel-2.5-107.el5_9.4.ia64.rpm
glibc-headers-2.5-107.el5_9.4.ia64.rpm
glibc-utils-2.5-107.el5_9.4.ia64.rpm
nscd-2.5-107.el5_9.4.ia64.rpm

ppc:
glibc-2.5-107.el5_9.4.ppc.rpm
glibc-2.5-107.el5_9.4.ppc64.rpm
glibc-common-2.5-107.el5_9.4.ppc.rpm
glibc-debuginfo-2.5-107.el5_9.4.ppc.rpm
glibc-debuginfo-2.5-107.el5_9.4.ppc64.rpm
glibc-devel-2.5-107.el5_9.4.ppc.rpm
glibc-devel-2.5-107.el5_9.4.ppc64.rpm
glibc-headers-2.5-107.el5_9.4.ppc.rpm
glibc-utils-2.5-107.el5_9.4.ppc.rpm
nscd-2.5-107.el5_9.4.ppc.rpm

s390x:
glibc-2.5-107.el5_9.4.s390.rpm
glibc-2.5-107.el5_9.4.s390x.rpm
glibc-common-2.5-107.el5_9.4.s390x.rpm
glibc-debuginfo-2.5-107.el5_9.4.s390.rpm
glibc-debuginfo-2.5-107.el5_9.4.s390x.rpm
glibc-devel-2.5-107.el5_9.4.s390.rpm
glibc-devel-2.5-107.el5_9.4.s390x.rpm
glibc-headers-2.5-107.el5_9.4.s390x.rpm
glibc-utils-2.5-107.el5_9.4.s390x.rpm
nscd-2.5-107.el5_9.4.s390x.rpm

x86_64:
glibc-2.5-107.el5_9.4.i686.rpm
glibc-2.5-107.el5_9.4.x86_64.rpm
glibc-common-2.5-107.el5_9.4.x86_64.rpm
glibc-debuginfo-2.5-107.el5_9.4.i386.rpm
glibc-debuginfo-2.5-107.el5_9.4.i686.rpm
glibc-debuginfo-2.5-107.el5_9.4.x86_64.rpm
glibc-debuginfo-common-2.5-107.el5_9.4.i386.rpm
glibc-devel-2.5-107.el5_9.4.i386.rpm
glibc-devel-2.5-107.el5_9.4.x86_64.rpm
glibc-headers-2.5-107.el5_9.4.x86_64.rpm
glibc-utils-2.5-107.el5_9.4.x86_64.rpm
nscd-2.5-107.el5_9.4.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-2013-0242.html
https://www.redhat.com/security/data/cve/CVE-2013-1914.html
https://access.redhat.com/security/updates/classification/#low
https://rhn.redhat.com/errata/RHSA-2012-1207.html
https://access.redhat.com/site/solutions/229993

8. Contact:

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

Copyright 2013 Red Hat, Inc.
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