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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
bzip2
[Debian Security Advisory DSA-730-1]
May 31, 2005 15:00 GMT Number P-210
[REVISED 17 Jun 2005]
[REVISED 13 Jul 2005]
[REVISED 14 Feb 2006]
______________________________________________________________________________
PROBLEM: A race condition can be exploited during decompression to
change the permissions of an existing user file.
PLATFORM: Debian GNU/Linux 3.0 alias woody
Red Hat Desktop (v. 2.1), (v. 3) & (v. 4)
Red Hat Enterprise Linux AS, ES, WS (v. 2.1), (v. 3), & (v. 4)
Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor
SGI ProPack 3 Service Pack 5 for SGI Altix family of systems
DAMAGE: A local attacker can get access to another user's file.
However, the attacker must already have access to the directory
that is receiving the decompressed file.
SOLUTION: Upgrade to the appropriate version.
______________________________________________________________________________
VULNERABILITY The risk is LOW. The attacker must be a local user with access
ASSESSMENT: to the directory receiving the decompressed file in order to
get access to the victim's file.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/p-210.shtml
ORIGINAL BULLETIN: http://www.debian.org/security/2005/dsa-730
ADDITIONAL LINKS: Red Hat RHSA-2005:474-15
https://rhn.redhat.com/errata/RHSA-2005-474.html
SGI Security Advisory Number 20050605-01-U
ftp://patches.sgi.com/support/free/security/advisories/20050605-01-U.asc
Red Hat RHSA-2005:474-21
https://rhn.redhat.com/errata/RHSA-2005-474.html
CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=
CAN-2005-0953
______________________________________________________________________________
REVISION HISTORY:
06/17/2005 - revised to add a link to Red Hat RHSA-2005:474-15 for Red Hat
Desktop (v. 3) & (v. 4), Red Hat Enterprise Linux AS, ES, WS
(v. 2.1), (v. 3), (v. 4), and Red Hat Linux Advanced Workstation
2.1 for the Itanium Processor.
07/13/2005 - added link to SGI Security Update #41, Number 20050605-01-U,
that provides SGI ProPack 3 Service Pack 5 for SGI Altix family
of systems.
02/14/2006 - revised to add a link to Red Hat RHSA-2005:474-21 for Red Hat
Desktop (v. 3) & (v. 4); Red Hat Enterprise Linux AS, ES, WS
(v.2.1), (v. 3), & (v. 4); Red Hat Linux Advanced Workstation 2.1
for the Itanium Processor.
[***** Start Debian Security Advisory DSA-730-1 *****]
Debian Security Advisory
DSA-730-1 bzip2 -- race condition
Date Reported:
27 May 2005
Affected Packages:
bzip2
Vulnerable:
Yes
Security database references:
In the Debian bugtracking system: Bug 303300.
In Mitre's CVE dictionary: CAN-2005-0953.
More information:
Imran Ghory discovered a race condition in bzip2, a high-quality block-sorting file
compressor and decompressor. When decompressing a file in a directory an attacker has access
to, bunzip2 could be tricked to set the file permissions to a different file the user has
permissions to.
For the stable distribution (woody) this problem has been fixed in version 1.0.2-1.woody2.
For the testing distribution (sarge) this problem has been fixed in version 1.0.2-6.
For the unstable distribution (sid) this problem has been fixed in version 1.0.2-6.
We recommend that you upgrade your bzip2 packages.
Fixed in:
Debian GNU/Linux 3.0 (woody)
Source:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2.dsc
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2.diff.gz
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2.orig.tar.gz
Alpha:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_alpha.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_alpha.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_alpha.deb
ARM:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_arm.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_arm.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_arm.deb
Intel IA-32:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_i386.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_i386.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_i386.deb
Intel IA-64:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_ia64.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_ia64.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_ia64.deb
HPPA:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_hppa.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_hppa.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_hppa.deb
Motorola 680x0:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_m68k.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_m68k.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_m68k.deb
Big endian MIPS:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_mips.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_mips.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_mips.deb
Little endian MIPS:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_mipsel.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_mipsel.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_mipsel.deb
PowerPC:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_powerpc.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_powerpc.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_powerpc.deb
IBM S/390:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_s390.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_s390.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_s390.deb
Sun Sparc:
http://security.debian.org/pool/updates/main/b/bzip2/bzip2_1.0.2-1.woody2_sparc.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-1.0_1.0.2-1.woody2_sparc.deb
http://security.debian.org/pool/updates/main/b/bzip2/libbz2-dev_1.0.2-1.woody2_sparc.deb
MD5 checksums of the listed files are available in the original advisory.
[***** End Debian Security Advisory DSA-730-1 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Debian for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
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