2.1 - RHSA-2005:261

Problem Description:

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