RHSA-2005:474 - Security Advisory

Topic

Updated bzip2 packages that fix multiple issues are now available.

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

[Updated 13 February 2006]
Replacement bzip2 packages for Red Hat Enterprise Linux 4 have been created
as the original erratum packages did not fix CVE-2005-0758.

Description

Bzip2 is a data compressor.

A bug was found in the way bzgrep processes file names. If a user can be
tricked into running bzgrep on a file with a carefully crafted file name,
arbitrary commands could be executed as the user running bzgrep. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CVE-2005-0758 to this issue.

A bug was found in the way bzip2 modifies file permissions during
decompression. If an attacker has write access to the directory into which
bzip2 is decompressing files, it is possible for them to modify permissions
on files owned by the user running bzip2 (CVE-2005-0953).

A bug was found in the way bzip2 decompresses files. It is possible for an
attacker to create a specially crafted bzip2 file which will cause bzip2 to
cause a denial of service (by filling disk space) if decompressed by a
victim (CVE-2005-1260).

Users of Bzip2 should upgrade to these updated packages, which contain
backported patches to correct these issues.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via Red Hat Network. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Server 3 x86_64
• Red Hat Enterprise Linux Server 3 ia64
• Red Hat Enterprise Linux Server 3 i386
• Red Hat Enterprise Linux Server 2 ia64
• Red Hat Enterprise Linux Server 2 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Workstation 3 x86_64
• Red Hat Enterprise Linux Workstation 3 ia64
• Red Hat Enterprise Linux Workstation 3 i386
• Red Hat Enterprise Linux Workstation 2 ia64
• Red Hat Enterprise Linux Workstation 2 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux Desktop 3 x86_64
• Red Hat Enterprise Linux Desktop 3 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for IBM z Systems 3 s390x
• Red Hat Enterprise Linux for IBM z Systems 3 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc
• Red Hat Enterprise Linux for Power, big endian 3 ppc

Fixes

• BZ - 155742 - CAN-2005-0953 bzip2 race condition
• BZ - 157548 - CAN-2005-1260 bzip2 decompression bomb (DoS)
• BZ - 159816 - CVE-2005-0758 bzgrep has security issue in sed usage

CVEs

• CVE-2005-1260
• CVE-2005-0953
• CVE-2005-0758

References

• http://scary.beasts.org/security/CESA-2005-002.txt