__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN GZIP Insecure Temporary Files [Debian Security Advisory DSA-588-1] November 8, 2004 17:00 GMT Number P-032 ______________________________________________________________________________ PROBLEM: Insecure temporary file creation in supplemental scripts in the gzip package. PLATFORM: Debian GNU/Linux 3.0 (woody) DAMAGE: May allow local users to overwrite files via a symlink attack. SOLUTION: Upgrade your gzip package. ______________________________________________________________________________ VULNERABILITY The risk is LOW. Could allow privilege escalation and local ASSESSMENT: users to overwrite files via a symlink attack. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/p-032.shtml ORIGINAL BULLETIN: http://www.debian.org/security/2004/dsa-588 CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CAN-2004-0970 ______________________________________________________________________________ [***** Start Debian Security Advisory DSA-588-1 *****] Debian Security Advisory DSA-588-1 gzip -- insecure temporary files Date Reported: 08 Nov 2004 Affected Packages: gzip Vulnerable: Yes Security database references: In the Bugtraq database (at SecurityFocus): BugTraq ID 11288. In Mitre's CVE dictionary: CAN-2004-0970. More information: Trustix developers discovered insecure temporary file creation in supplemental scripts in the gzip package which may allow local users to overwrite files via a symlink attack. For the stable distribution (woody) these problems have been fixed in version 1.3.2-3woody3. The unstable distribution (sid) is not affected by these problems. We recommend that you upgrade your gzip package. Fixed in: Debian GNU/Linux 3.0 (woody) Source: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3.dsc http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3.diff.gz http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2.orig.tar.gz Alpha: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_alpha.deb ARM: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_arm.deb Intel IA-32: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_i386.deb Intel IA-64: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_ia64.deb HPPA: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_hppa.deb Motorola 680x0: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_m68k.deb Big endian MIPS: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_mips.deb Little endian MIPS: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_mipsel.deb PowerPC: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_powerpc.deb IBM S/390: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_s390.deb Sun Sparc: http://security.debian.org/pool/updates/main/g/gzip/gzip_1.3.2-3woody3_sparc.deb MD5 checksums of the listed files are available in the original advisory. [***** End Debian Security Advisory DSA-588-1 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Debian Security 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. 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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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