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Category:   Application (Generic)  >   Glibc Vendors:   GNU [multiple authors]
(Red Hat Issues Fix) Glibc Locale Command May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1025295
SecurityTracker URL:  http://securitytracker.com/id/1025295
CVE Reference:   CVE-2011-1095   (Links to External Site)
Date:  Apr 5 2011
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2.12.1 and prior versions
Description:   A vulnerability was reported in Glibc. A local user may be able to obtain elevated privileges on the target system.

The locale command does not properly escape user-supplied output. A local user with the ability to set the local environment variables of a script that performs shell evaluation of the output of the locale command may be able to cause arbitrary commands to be executed by the target script. The commands will run with the privileges of the target script.

Harald van Dijk reported this vulnerability.
Impact:   A local user may be able to 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-2011-0413.html
Vendor URL:  www.gnu.org/software/libc/ (Links to External Site)
Cause:   Input validation error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 4 2011 Glibc Locale Command May Let Local Users Gain Elevated Privileges


 Source Message Contents
Date:  Mon, 4 Apr 2011 14:25:24 -0600
Subject:  [RHSA-2011:0413-01] Important: glibc security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: glibc security update
Advisory ID:       RHSA-2011:0413-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0413.html
Issue date:        2011-04-04
CVE Names:         CVE-2011-0536 CVE-2011-1071 CVE-2011-1095 
=====================================================================

1. Summary:

Updated glibc packages that fix three security issues are now available for
Red Hat Enterprise Linux 6.

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

3. Description:

The glibc packages contain the standard C libraries used by multiple
programs on the system. These packages contain the standard C and the
standard math libraries. Without these two libraries, a Linux system cannot
function properly.

The fix for CVE-2010-3847 introduced a regression in the way the dynamic
loader expanded the $ORIGIN dynamic string token specified in the RPATH and
RUNPATH entries in the ELF library header. A local attacker could use this
flaw to escalate their privileges via a setuid or setgid program using
such a library. (CVE-2011-0536)

It was discovered that the glibc fnmatch() function did not properly
restrict the use of alloca(). If the function was called on sufficiently
large inputs, it could cause an application using fnmatch() to crash or,
possibly, execute arbitrary code with the privileges of the application.
(CVE-2011-1071)

It was discovered that the locale command did not produce properly escaped
output as required by the POSIX specification. If an attacker were able to
set the locale environment variables in the environment of a script that
performed shell evaluation on the output of the locale command, and that
script were run with different privileges than the attacker's, it could
execute arbitrary code with the privileges of the script. (CVE-2011-1095)

All users should 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/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

625893 - CVE-2011-1095 glibc: insufficient quoting in the locale command output
667974 - CVE-2011-0536 glibc: CVE-2010-3847 fix causes linker to search CWD when running privileged program with $ORIGIN in R*PATH
681054 - CVE-2011-1071 glibc: fnmatch() alloca()-based memory corruption flaw

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

i386:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-common-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-headers-2.12-1.7.el6_0.5.i686.rpm
glibc-utils-2.12-1.7.el6_0.5.i686.rpm
nscd-2.12-1.7.el6_0.5.i686.rpm

x86_64:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-2.12-1.7.el6_0.5.x86_64.rpm
glibc-common-2.12-1.7.el6_0.5.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.5.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.5.x86_64.rpm
nscd-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

i386:
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-static-2.12-1.7.el6_0.5.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-static-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

x86_64:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-2.12-1.7.el6_0.5.x86_64.rpm
glibc-common-2.12-1.7.el6_0.5.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.5.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-static-2.12-1.7.el6_0.5.x86_64.rpm
nscd-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

i386:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-common-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-headers-2.12-1.7.el6_0.5.i686.rpm
glibc-utils-2.12-1.7.el6_0.5.i686.rpm
nscd-2.12-1.7.el6_0.5.i686.rpm

ppc64:
glibc-2.12-1.7.el6_0.5.ppc.rpm
glibc-2.12-1.7.el6_0.5.ppc64.rpm
glibc-common-2.12-1.7.el6_0.5.ppc64.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.ppc.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.ppc64.rpm
glibc-devel-2.12-1.7.el6_0.5.ppc.rpm
glibc-devel-2.12-1.7.el6_0.5.ppc64.rpm
glibc-headers-2.12-1.7.el6_0.5.ppc64.rpm
glibc-utils-2.12-1.7.el6_0.5.ppc64.rpm
nscd-2.12-1.7.el6_0.5.ppc64.rpm

s390x:
glibc-2.12-1.7.el6_0.5.s390.rpm
glibc-2.12-1.7.el6_0.5.s390x.rpm
glibc-common-2.12-1.7.el6_0.5.s390x.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.s390.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.s390x.rpm
glibc-devel-2.12-1.7.el6_0.5.s390.rpm
glibc-devel-2.12-1.7.el6_0.5.s390x.rpm
glibc-headers-2.12-1.7.el6_0.5.s390x.rpm
glibc-utils-2.12-1.7.el6_0.5.s390x.rpm
nscd-2.12-1.7.el6_0.5.s390x.rpm

x86_64:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-2.12-1.7.el6_0.5.x86_64.rpm
glibc-common-2.12-1.7.el6_0.5.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.5.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.5.x86_64.rpm
nscd-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

i386:
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-static-2.12-1.7.el6_0.5.i686.rpm

ppc64:
glibc-debuginfo-2.12-1.7.el6_0.5.ppc64.rpm
glibc-static-2.12-1.7.el6_0.5.ppc64.rpm

s390x:
glibc-debuginfo-2.12-1.7.el6_0.5.s390x.rpm
glibc-static-2.12-1.7.el6_0.5.s390x.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-static-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

i386:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-common-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-headers-2.12-1.7.el6_0.5.i686.rpm
glibc-utils-2.12-1.7.el6_0.5.i686.rpm
nscd-2.12-1.7.el6_0.5.i686.rpm

x86_64:
glibc-2.12-1.7.el6_0.5.i686.rpm
glibc-2.12-1.7.el6_0.5.x86_64.rpm
glibc-common-2.12-1.7.el6_0.5.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.5.i686.rpm
glibc-devel-2.12-1.7.el6_0.5.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.5.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.5.x86_64.rpm
nscd-2.12-1.7.el6_0.5.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/glibc-2.12-1.7.el6_0.5.src.rpm

i386:
glibc-debuginfo-2.12-1.7.el6_0.5.i686.rpm
glibc-static-2.12-1.7.el6_0.5.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.5.x86_64.rpm
glibc-static-2.12-1.7.el6_0.5.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-2011-0536.html
https://www.redhat.com/security/data/cve/CVE-2011-1071.html
https://www.redhat.com/security/data/cve/CVE-2011-1095.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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