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Category:   Application (Generic)  >   Glibc Vendors:   GNU [multiple authors]
(Red Hat Issues Fix) Glibc stdlib Buffer Overflows May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1027445
SecurityTracker URL:  http://securitytracker.com/id/1027445
CVE Reference:   CVE-2012-3480   (Links to External Site)
Date:  Aug 27 2012
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Glibc. A local user can obtain elevated privileges on the target system.

A local user can supply specially crafted data to certain stdlib functions (e.g., strtod, strtof, strtold, strtod_l) to trigger an integer overflow and resulting buffer overflow to execute arbitrary code on the target system with the privileges of the target application.
Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-1207.html
Vendor URL:  www.gnu.org/software/libc/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Aug 13 2012 Glibc stdlib Buffer Overflows May Let Local Users Gain Elevated Privileges


 Source Message Contents
Date:  Mon, 27 Aug 2012 13:19:42 +0000
Subject:  [RHSA-2012:1207-01] Moderate: glibc security and bug fix update

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

Synopsis:          Moderate: glibc security and bug fix update
Advisory ID:       RHSA-2012:1207-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1207.html
Issue date:        2012-08-27
CVE Names:         CVE-2012-3480 
=====================================================================

1. Summary:

Updated glibc packages that fix multiple security issues 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.

Multiple integer overflow flaws, leading to stack-based buffer overflows,
were found in glibc's functions for converting a string to a numeric
representation (strtod(), strtof(), and strtold()). If an application used
such a function on attacker controlled input, it could cause the
application to crash or, potentially, execute arbitrary code.
(CVE-2012-3480)

This update also fixes the following bug:

* Previously, logic errors in various mathematical functions, including
exp, exp2, expf, exp2f, pow, sin, tan, and rint, caused inconsistent
results when the functions were used with the non-default rounding mode.
This could also cause applications to crash in some cases. With this
update, the functions now give correct results across the four different
rounding modes. (BZ#839411)

All 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/):

847715 - CVE-2012-3480 glibc: Integer overflows, leading to stack-based buffer overflows in strto* related routines

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_8.7.src.rpm

i386:
glibc-2.5-81.el5_8.7.i386.rpm
glibc-2.5-81.el5_8.7.i686.rpm
glibc-common-2.5-81.el5_8.7.i386.rpm
glibc-debuginfo-2.5-81.el5_8.7.i386.rpm
glibc-debuginfo-2.5-81.el5_8.7.i686.rpm
glibc-debuginfo-common-2.5-81.el5_8.7.i386.rpm
glibc-devel-2.5-81.el5_8.7.i386.rpm
glibc-headers-2.5-81.el5_8.7.i386.rpm
glibc-utils-2.5-81.el5_8.7.i386.rpm
nscd-2.5-81.el5_8.7.i386.rpm

x86_64:
glibc-2.5-81.el5_8.7.i686.rpm
glibc-2.5-81.el5_8.7.x86_64.rpm
glibc-common-2.5-81.el5_8.7.x86_64.rpm
glibc-debuginfo-2.5-81.el5_8.7.i386.rpm
glibc-debuginfo-2.5-81.el5_8.7.i686.rpm
glibc-debuginfo-2.5-81.el5_8.7.x86_64.rpm
glibc-debuginfo-common-2.5-81.el5_8.7.i386.rpm
glibc-devel-2.5-81.el5_8.7.i386.rpm
glibc-devel-2.5-81.el5_8.7.x86_64.rpm
glibc-headers-2.5-81.el5_8.7.x86_64.rpm
glibc-utils-2.5-81.el5_8.7.x86_64.rpm
nscd-2.5-81.el5_8.7.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_8.7.src.rpm

i386:
glibc-2.5-81.el5_8.7.i386.rpm
glibc-2.5-81.el5_8.7.i686.rpm
glibc-common-2.5-81.el5_8.7.i386.rpm
glibc-debuginfo-2.5-81.el5_8.7.i386.rpm
glibc-debuginfo-2.5-81.el5_8.7.i686.rpm
glibc-debuginfo-common-2.5-81.el5_8.7.i386.rpm
glibc-devel-2.5-81.el5_8.7.i386.rpm
glibc-headers-2.5-81.el5_8.7.i386.rpm
glibc-utils-2.5-81.el5_8.7.i386.rpm
nscd-2.5-81.el5_8.7.i386.rpm

ia64:
glibc-2.5-81.el5_8.7.i686.rpm
glibc-2.5-81.el5_8.7.ia64.rpm
glibc-common-2.5-81.el5_8.7.ia64.rpm
glibc-debuginfo-2.5-81.el5_8.7.i686.rpm
glibc-debuginfo-2.5-81.el5_8.7.ia64.rpm
glibc-devel-2.5-81.el5_8.7.ia64.rpm
glibc-headers-2.5-81.el5_8.7.ia64.rpm
glibc-utils-2.5-81.el5_8.7.ia64.rpm
nscd-2.5-81.el5_8.7.ia64.rpm

ppc:
glibc-2.5-81.el5_8.7.ppc.rpm
glibc-2.5-81.el5_8.7.ppc64.rpm
glibc-common-2.5-81.el5_8.7.ppc.rpm
glibc-debuginfo-2.5-81.el5_8.7.ppc.rpm
glibc-debuginfo-2.5-81.el5_8.7.ppc64.rpm
glibc-devel-2.5-81.el5_8.7.ppc.rpm
glibc-devel-2.5-81.el5_8.7.ppc64.rpm
glibc-headers-2.5-81.el5_8.7.ppc.rpm
glibc-utils-2.5-81.el5_8.7.ppc.rpm
nscd-2.5-81.el5_8.7.ppc.rpm

s390x:
glibc-2.5-81.el5_8.7.s390.rpm
glibc-2.5-81.el5_8.7.s390x.rpm
glibc-common-2.5-81.el5_8.7.s390x.rpm
glibc-debuginfo-2.5-81.el5_8.7.s390.rpm
glibc-debuginfo-2.5-81.el5_8.7.s390x.rpm
glibc-devel-2.5-81.el5_8.7.s390.rpm
glibc-devel-2.5-81.el5_8.7.s390x.rpm
glibc-headers-2.5-81.el5_8.7.s390x.rpm
glibc-utils-2.5-81.el5_8.7.s390x.rpm
nscd-2.5-81.el5_8.7.s390x.rpm

x86_64:
glibc-2.5-81.el5_8.7.i686.rpm
glibc-2.5-81.el5_8.7.x86_64.rpm
glibc-common-2.5-81.el5_8.7.x86_64.rpm
glibc-debuginfo-2.5-81.el5_8.7.i386.rpm
glibc-debuginfo-2.5-81.el5_8.7.i686.rpm
glibc-debuginfo-2.5-81.el5_8.7.x86_64.rpm
glibc-debuginfo-common-2.5-81.el5_8.7.i386.rpm
glibc-devel-2.5-81.el5_8.7.i386.rpm
glibc-devel-2.5-81.el5_8.7.x86_64.rpm
glibc-headers-2.5-81.el5_8.7.x86_64.rpm
glibc-utils-2.5-81.el5_8.7.x86_64.rpm
nscd-2.5-81.el5_8.7.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-2012-3480.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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