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Red Hat Enterprise Linux 6: Advisory RHSA-2010:0872-02 on glibc Risks

Calendar Nov 10, 2010 • User Avatar LinuxSecurity Advisories
5 - 10 min read
Redhat Large Esm H500
Topics%20covered

Topics Covered

security advisory bug fix Red Hat Enterprise Linux important glibc local attack escalation risks
Updated glibc packages that fix two security issues and two bugs 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 
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Hash: SHA1

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

Synopsis:          Important: glibc security and bug fix update
Advisory ID:       RHSA-2010:0872-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2010:0872.html
Issue date:        2010-11-10
CVE Names:         CVE-2010-3847 CVE-2010-3856 
====================================================================
1. Summary:

Updated glibc packages that fix two security issues and two bugs 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.

It was discovered that the glibc dynamic linker/loader did not handle the
$ORIGIN dynamic string token set in the LD_AUDIT environment variable
securely. A local attacker with write access to a file system containing
setuid or setgid binaries could use this flaw to escalate their privileges.
(CVE-2010-3847)

It was discovered that the glibc dynamic linker/loader did not perform
sufficient safety checks when loading dynamic shared objects (DSOs) to
provide callbacks for its auditing API during the execution of privileged
programs. A local attacker could use this flaw to escalate their privileges
via a carefully-chosen system DSO library containing unsafe constructors.
(CVE-2010-3856)

Red Hat would like to thank Tavis Ormandy for reporting the CVE-2010-3847
issue, and Ben Hawkes and Tavis Ormandy for reporting the CVE-2010-3856
issue.

This update also fixes the following bugs:

* Previously, the generic implementation of the strstr() and memmem()
functions did not handle certain periodic patterns correctly and could find
a false positive match. This error has been fixed, and both functions now
work as expected. (BZ#643341)

* The "TCB_ALIGNMENT" value has been increased to 32 bytes to prevent
applications from crashing during symbol resolution on 64-bit systems with
support for Intel AVX vector registers. (BZ#643343)

All users 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/kb/docs/DOC-11259

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

643306 - CVE-2010-3847 glibc: ld.so insecure handling of $ORIGIN in LD_AUDIT for setuid/setgid programs
643341 - memmem, strstr, and strcasestr are broken
643343 - [Intel 6.0 Bug] Dynamic linker failed to align TCB for AVX
645672 - CVE-2010-3856 glibc: ld.so arbitrary DSO loading via LD_AUDIT in setuid/setgid programs

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:

i386:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-common-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-headers-2.12-1.7.el6_0.3.i686.rpm
glibc-utils-2.12-1.7.el6_0.3.i686.rpm
nscd-2.12-1.7.el6_0.3.i686.rpm

x86_64:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-2.12-1.7.el6_0.3.x86_64.rpm
glibc-common-2.12-1.7.el6_0.3.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.3.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.3.x86_64.rpm
nscd-2.12-1.7.el6_0.3.x86_64.rpm

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

Source:

i386:
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-static-2.12-1.7.el6_0.3.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-static-2.12-1.7.el6_0.3.x86_64.rpm

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

Source:

x86_64:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-2.12-1.7.el6_0.3.x86_64.rpm
glibc-common-2.12-1.7.el6_0.3.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.3.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.3.x86_64.rpm

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

Source:

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-static-2.12-1.7.el6_0.3.x86_64.rpm
nscd-2.12-1.7.el6_0.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:

i386:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-common-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-headers-2.12-1.7.el6_0.3.i686.rpm
glibc-utils-2.12-1.7.el6_0.3.i686.rpm
nscd-2.12-1.7.el6_0.3.i686.rpm

ppc64:
glibc-2.12-1.7.el6_0.3.ppc.rpm
glibc-2.12-1.7.el6_0.3.ppc64.rpm
glibc-common-2.12-1.7.el6_0.3.ppc64.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.ppc.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.ppc64.rpm
glibc-devel-2.12-1.7.el6_0.3.ppc.rpm
glibc-devel-2.12-1.7.el6_0.3.ppc64.rpm
glibc-headers-2.12-1.7.el6_0.3.ppc64.rpm
glibc-utils-2.12-1.7.el6_0.3.ppc64.rpm
nscd-2.12-1.7.el6_0.3.ppc64.rpm

s390x:
glibc-2.12-1.7.el6_0.3.s390.rpm
glibc-2.12-1.7.el6_0.3.s390x.rpm
glibc-common-2.12-1.7.el6_0.3.s390x.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.s390.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.s390x.rpm
glibc-devel-2.12-1.7.el6_0.3.s390.rpm
glibc-devel-2.12-1.7.el6_0.3.s390x.rpm
glibc-headers-2.12-1.7.el6_0.3.s390x.rpm
glibc-utils-2.12-1.7.el6_0.3.s390x.rpm
nscd-2.12-1.7.el6_0.3.s390x.rpm

x86_64:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-2.12-1.7.el6_0.3.x86_64.rpm
glibc-common-2.12-1.7.el6_0.3.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.3.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.3.x86_64.rpm
nscd-2.12-1.7.el6_0.3.x86_64.rpm

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

Source:

i386:
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-static-2.12-1.7.el6_0.3.i686.rpm

ppc64:
glibc-debuginfo-2.12-1.7.el6_0.3.ppc64.rpm
glibc-static-2.12-1.7.el6_0.3.ppc64.rpm

s390x:
glibc-debuginfo-2.12-1.7.el6_0.3.s390x.rpm
glibc-static-2.12-1.7.el6_0.3.s390x.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-static-2.12-1.7.el6_0.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:

i386:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-common-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-headers-2.12-1.7.el6_0.3.i686.rpm
glibc-utils-2.12-1.7.el6_0.3.i686.rpm
nscd-2.12-1.7.el6_0.3.i686.rpm

x86_64:
glibc-2.12-1.7.el6_0.3.i686.rpm
glibc-2.12-1.7.el6_0.3.x86_64.rpm
glibc-common-2.12-1.7.el6_0.3.x86_64.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-devel-2.12-1.7.el6_0.3.i686.rpm
glibc-devel-2.12-1.7.el6_0.3.x86_64.rpm
glibc-headers-2.12-1.7.el6_0.3.x86_64.rpm
glibc-utils-2.12-1.7.el6_0.3.x86_64.rpm
nscd-2.12-1.7.el6_0.3.x86_64.rpm

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

Source:

i386:
glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm
glibc-static-2.12-1.7.el6_0.3.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm
glibc-static-2.12-1.7.el6_0.3.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-2010-3847
https://access.redhat.com/security/cve/CVE-2010-3856
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 2010 Red Hat, Inc.
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Red Hat Enterprise Linux 6: Advisory RHSA-2010:0872-02 on glibc Risks

red hat
Calendar Grey November 10, 2010
Dist Redhat Esm H88
Significant announcement regarding glibc addresses vulnerabilities and issues in Red Hat Enterprise Linux 6, addressing potential risks of privilege elevation.
Updated glibc packages that fix two security issues and two bugs 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.
It was discovered that the glibc dynamic linker/loader did not handle the $ORIGIN dynamic string token set in the LD_AUDIT environment variable securely. A local attacker with write access to a file system containing setuid or setgid binaries could use this flaw to escalate their privileges. (CVE-2010-3847)
It was discovered that the glibc dynamic linker/loader did not perform sufficient safety checks when loading dynamic shared objects (DSOs) to provide callbacks for its auditing API during the execution of privileged programs. A local attacker could use this flaw to escalate their privileges via a carefully-chosen system DSO library containing unsafe constructors. (CVE-2010-3856)
Red Hat would like to thank Tavis Ormandy for reporting the CVE-2010-3847 issue, and Ben Hawkes and Tavis Ormandy for reporting the CVE-2010-3856 issue.
This update also fixes the following bugs:
* Previously, the generic implementation of the strstr() and memmem() functions did not handle certain periodic patterns correctly and could find a false positive match. This error has been fixed, and both functions now work as expected. (BZ#643341)
* The "TCB_ALIGNMENT" value has been increased to 32 bytes to prevent applications from crashing during symbol resolution on 64-bit systems with support for Intel AVX vector registers. (BZ#643343)
All users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Topics%20covered

Topics Covered

security advisory bug fix Red Hat Enterprise Linux important glibc local attack escalation risks

References

https://access.redhat.com/security/cve/CVE-2010-3847 https://access.redhat.com/security/cve/CVE-2010-3856 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_0.3.i686.rpm glibc-common-2.12-1.7.el6_0.3.i686.rpm glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm glibc-devel-2.12-1.7.el6_0.3.i686.rpm glibc-headers-2.12-1.7.el6_0.3.i686.rpm glibc-utils-2.12-1.7.el6_0.3.i686.rpm nscd-2.12-1.7.el6_0.3.i686.rpm
x86_64: glibc-2.12-1.7.el6_0.3.i686.rpm glibc-2.12-1.7.el6_0.3.x86_64.rpm glibc-common-2.12-1.7.el6_0.3.x86_64.rpm glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm glibc-devel-2.12-1.7.el6_0.3.i686.rpm glibc-devel-2.12-1.7.el6_0.3.x86_64.rpm glibc-headers-2.12-1.7.el6_0.3.x86_64.rpm glibc-utils-2.12-1.7.el6_0.3.x86_64.rpm nscd-2.12-1.7.el6_0.3.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
i386: glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm glibc-static-2.12-1.7.el6_0.3.i686.rpm
x86_64: glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm glibc-static-2.12-1.7.el6_0.3.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
x86_64: glibc-2.12-1.7.el6_0.3.i686.rpm glibc-2.12-1.7.el6_0.3.x86_64.rpm glibc-common-2.12-1.7.el6_0.3.x86_64.rpm glibc-debuginfo-2.12-1.7.el6_0.3.i686.rpm glibc-debuginfo-2.12-1.7.el6_0.3.x86_64.rpm glibc-devel-2.12-1.7.el6_0.3.i686.rpm glibc-devel-2.12-1.7.el6_0.3.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2010:0872-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2010:0872.html
Issue date: 2010-11-10

Topic

Updated glibc packages that fix two security issues and two bugs are nowavailable for Red 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 bug fix Red Hat Enterprise Linux important glibc local attack escalation risks

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

643306 - CVE-2010-3847 glibc: ld.so insecure handling of $ORIGIN in LD_AUDIT for setuid/setgid programs

643341 - memmem, strstr, and strcasestr are broken

643343 - [Intel 6.0 Bug] Dynamic linker failed to align TCB for AVX

645672 - CVE-2010-3856 glibc: ld.so arbitrary DSO loading via LD_AUDIT in setuid/setgid programs

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