__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN 'arc' Insecure Temporary File Creation [Debian Security Advisory DSA-843] October 5, 2005 17:00 GMT Number Q-004 ______________________________________________________________________________ PROBLEM: Two vulnerabilities have been discovered in the ARC archive program under Unix. PLATFORM: Debian GNU/Linux 3.1 (sarge) DAMAGE: One of the vulnerabilities in 'arc' allows a temporary file to be created in an insecure fashion and may lead to a classic symlink attack. SOLUTION: Apply the available security updates. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. Exploiting the vulnerabilities may lead to ASSESSMENT: privilege escalation and/or information disclosure. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-004.shtml ORIGINAL BULLETIN: http://www.debian.org/security/2005/dsa-843 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2005-2945, CVE-2005-2992 ______________________________________________________________________________ [***** Start Debian Security Advisory DSA-843 *****] DSA-843-1 arc -- insecure temporary file Date Reported: 05 Oct 2005 Affected Packages: arc Vulnerable: Yes Security database references: In Mitre's CVE dictionary: CAN-2005-2945, CAN-2005-2992. More information: Two vulnerabilities have been discovered in the ARC archive program under Unix. The Common Vulnerabilities and Exposures project identifies the following problems: * CAN-2005-2945 Eric Romang discovered that the ARC archive program under Unix creates a temporary file with insecure permissions which may lead to an attacker stealing sensitive information. * CAN-2005-2992 Joey Schulze discovered that the temporary file was created in an insecure fashion as well, leaving it open to a classic symlink attack. The old stable distribution (woody) does not contain arc packages. For the stable distribution (sarge) these problems have been fixed in version 5.21l-1sarge1. For the unstable distribution (sid) these problems have been fixed in version 5.21m-1. We recommend that you upgrade your arc package. Fixed in: Debian GNU/Linux 3.1 (sarge) Source: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1.dsc http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1.diff.gz http://security.debian.org/pool/updates/main/a/arc/arc_5.21l.orig.tar.gz Alpha: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_alpha.deb AMD64: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_amd64.deb ARM: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_arm.deb Intel IA-32: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_i386.deb Intel IA-64: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_ia64.deb HPPA: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_hppa.deb Motorola 680x0: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_m68k.deb Big endian MIPS: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_mips.deb Little endian MIPS: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_mipsel.deb PowerPC: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_powerpc.deb IBM S/390: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_s390.deb Sun Sparc: http://security.debian.org/pool/updates/main/a/arc/arc_5.21l- 1sarge1_sparc.deb MD5 checksums of the listed files are available in the original advisory. [***** End Debian Security Advisory DSA-843 *****] _______________________________________________________________________________ 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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