__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ 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 member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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