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Red Hat: RHSA-2011:0413-01 Critical Security Alert for glibc Flaws

Calendar Apr 04, 2011 • User Avatar LinuxSecurity Advisories
5 - 10 min read
Redhat Large Esm H500
Topics%20covered

Topics Covered

security advisory critical privilege escalation memory corruption Red Hat Enterprise Linux security patch glibc
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 [More...] 
====================================================================                   Red Hat Security Advisory

Synopsis:          Important: glibc security update
Advisory ID:       RHSA-2011:0413-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.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:

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:

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:

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:

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:

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:

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:

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:

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://access.redhat.com/security/cve/CVE-2011-0536
https://access.redhat.com/security/cve/CVE-2011-1071
https://access.redhat.com/security/cve/CVE-2011-1095
https://access.redhat.com/security/updates/classification#important

8. Contact:

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

Copyright 2011 Red Hat, Inc.

Red Hat: RHSA-2011:0413-01 Critical Security Alert for glibc Flaws

red hat
Calendar Grey April 4, 2011
Dist Redhat Esm H88
Crucial glibc patch released for Red Hat Enterprise Linux 6 resolving major security vulnerabilities. Update immediately.
Updated glibc packages that fix three security issues are now available for Red Hat Enterprise Linux 6

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

Summary

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.

Topics%20covered

Topics Covered

security advisory critical privilege escalation memory corruption Red Hat Enterprise Linux security patch glibc

References

https://access.redhat.com/security/cve/CVE-2011-0536 https://access.redhat.com/security/cve/CVE-2011-1071 https://access.redhat.com/security/cve/CVE-2011-1095 https://access.redhat.com/security/updates/classification#important

Package List

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

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:0413-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0413.html
Issue date: 2011-04-04

Topic

Updated glibc packages that fix three security issues are now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. Common Vulnerability Scoring System (CVSS) basescores, which give detailed severity ratings, are available for eachvulnerability from the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory critical privilege escalation memory corruption Red Hat Enterprise Linux security patch glibc

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

Bugs Fixed

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

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