RedHat: Low: glibc security update
Posted by Benjamin D. Thomas   
RedHat Linux Updated glibc packages that address several bugs are now available. This update has been rated as having low security impact by the Red Hat Security Response Team.
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                   Red Hat Security Advisory

Synopsis:          Low: glibc security update
Advisory ID:       RHSA-2005:261-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2005-261.html
Issue date:        2005-04-28
Updated on:        2005-04-28
Product:           Red Hat Enterprise Linux
Keywords:          glibc LD_DEBUG catchsegv glibcbug
CVE Names:         CAN-2004-0968 CAN-2004-1382 CAN-2004-1453
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1. Summary:

Updated glibc packages that address several bugs are now available.

This update has been rated as having low security impact by the Red Hat
Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

The GNU libc packages (known as glibc) contain the standard C libraries
used by applications.

Flaws in the catchsegv and glibcbug scripts were discovered. A local user
could utilize these flaws to overwrite files via a symlink attack on
temporary files.  The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2004-0968 and CAN-2004-1382 to
these issues.

It was discovered that the use of LD_DEBUG and LD_SHOW_AUXV were not
restricted for a setuid program.  A local user could utilize this flaw to
gain information, such as the list of symbols used by the program.  The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name  CAN-2004-1453 to this issue.

This erratum also addresses the following bugs in the GNU C Library:
- - Now avoids calling sigaction (SIGPIPE, ...) in syslog implementation
- - Fixed poll on Itanium
- - Now allows setenv/putenv in shared library constructors

Users of glibc are advised to upgrade to these erratum packages that remove
the unecessary glibcbug script and contain backported patches to correct
these other issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  Use Red Hat
Network to download and update your packages.  To launch the Red Hat
Update Agent, use the following command:

    up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

    http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

140068 - [RHAS2.1] CAN-2004-0968 temporary file vulnerabilities in catchsegv script
140487 - [RHAS2.1] Bad declaration of __syscall_poll can cause bogus values for timeout to be passed to the kernel
148814 - CAN-2004-1453 Information leak with LD_DEBUG
148800 - CAN-2004-1382 insecure temporary file usage

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/glibc-2.2.4-32.20.src.rpm
86c397f7614278f57b9b814d6adedace  glibc-2.2.4-32.20.src.rpm

i386:
5b601e85eba293c52d9fe15d8e766a12  glibc-2.2.4-32.20.i386.rpm
e1c21533e3d86da39390e93d4b93060e  glibc-2.2.4-32.20.i686.rpm
b7eda3e6a3b7f24813415c692bde5cff  glibc-common-2.2.4-32.20.i386.rpm
0b39ef1f661609a0346675b1877a6288  glibc-devel-2.2.4-32.20.i386.rpm
88ed7d4adfcf4627478367a253a65989  glibc-profile-2.2.4-32.20.i386.rpm
b3d6d4389676fc0652277f490d47dfec  nscd-2.2.4-32.20.i386.rpm

ia64:
158103afa78aec998e3db120d245cd37  glibc-2.2.4-32.20.ia64.rpm
321c25cf3605db040fef49a79c443618  glibc-common-2.2.4-32.20.ia64.rpm
a5eb76dc9b8dbcf8cfd6938d1a957977  glibc-devel-2.2.4-32.20.ia64.rpm
b24148c15938f32f7a5f7df0773eb092  glibc-profile-2.2.4-32.20.ia64.rpm
925478d53517e5cd62762f608b4e26f8  nscd-2.2.4-32.20.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/glibc-2.2.4-32.20.src.rpm
86c397f7614278f57b9b814d6adedace  glibc-2.2.4-32.20.src.rpm

ia64:
158103afa78aec998e3db120d245cd37  glibc-2.2.4-32.20.ia64.rpm
321c25cf3605db040fef49a79c443618  glibc-common-2.2.4-32.20.ia64.rpm
a5eb76dc9b8dbcf8cfd6938d1a957977  glibc-devel-2.2.4-32.20.ia64.rpm
b24148c15938f32f7a5f7df0773eb092  glibc-profile-2.2.4-32.20.ia64.rpm
925478d53517e5cd62762f608b4e26f8  nscd-2.2.4-32.20.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/glibc-2.2.4-32.20.src.rpm
86c397f7614278f57b9b814d6adedace  glibc-2.2.4-32.20.src.rpm

i386:
5b601e85eba293c52d9fe15d8e766a12  glibc-2.2.4-32.20.i386.rpm
e1c21533e3d86da39390e93d4b93060e  glibc-2.2.4-32.20.i686.rpm
b7eda3e6a3b7f24813415c692bde5cff  glibc-common-2.2.4-32.20.i386.rpm
0b39ef1f661609a0346675b1877a6288  glibc-devel-2.2.4-32.20.i386.rpm
88ed7d4adfcf4627478367a253a65989  glibc-profile-2.2.4-32.20.i386.rpm
b3d6d4389676fc0652277f490d47dfec  nscd-2.2.4-32.20.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/glibc-2.2.4-32.20.src.rpm
86c397f7614278f57b9b814d6adedace  glibc-2.2.4-32.20.src.rpm

i386:
5b601e85eba293c52d9fe15d8e766a12  glibc-2.2.4-32.20.i386.rpm
e1c21533e3d86da39390e93d4b93060e  glibc-2.2.4-32.20.i686.rpm
b7eda3e6a3b7f24813415c692bde5cff  glibc-common-2.2.4-32.20.i386.rpm
0b39ef1f661609a0346675b1877a6288  glibc-devel-2.2.4-32.20.i386.rpm
88ed7d4adfcf4627478367a253a65989  glibc-profile-2.2.4-32.20.i386.rpm
b3d6d4389676fc0652277f490d47dfec  nscd-2.2.4-32.20.i386.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0968
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1382
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1453

8. Contact:

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

Copyright 2005 Red Hat, Inc.