__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN OpenAFS Vulnerability [Debian Security Advisory DSA-1271-1] March 22, 2007 15:00 GMT Number R-183 ______________________________________________________________________________ PROBLEM: A vulnerability in OpenAFS allows files in the local cell to be set to SUID by an unauthenticated user. PLATFORM: Debian GNU/Linux 3.1 (stable) DAMAGE: An unauthenticated user of the AFS system can changed a file to SUID and get root on the system. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An unauthenticated user of the AFS system ASSESSMENT: can change a file to SUID and get root on the system. This should be considered high if the AFS system is accessible by the Internet. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-183.shtml ORIGINAL BULLETIN: http://www.debian.org/security/2007/dsa-1271 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-1507 ______________________________________________________________________________ [***** Start Debian Security Advisory DSA-1271-1 *****] Debian Security Advisory DSA-1271-1 openafs -- design error Date Reported: 20 Mar 2007 Affected Packages: openafs Vulnerable: Yes Security database references: In Mitre's CVE dictionary: CVE-2007-1507. More information: A design error has been identified in the OpenAFS, a cross-platform distributed filesystem included with Debian. OpenAFS historically has enabled setuid filesystem support for the local cell. However, with its existing protocol, OpenAFS can only use encryption, and therefore integrity protection, if the user is authenticated. Unauthenticated access doesn't do integrity protection. The practical result is that it's possible for an attacker with knowledge of AFS to forge an AFS FetchStatus call and make an arbitrary binary file appear to an AFS client host to be setuid. If they can then arrange for that binary to be executed, they will be able to achieve privilege escalation. OpenAFS 1.3.81-3sarge2 changes the default behavior to disable setuid files globally, including the local cell. It is important to note that this change will not take effect until the AFS kernel module, built from the openafs-modules- source package, is rebuilt and loaded into your kernel. As a temporary workaround until the kernel module can be reloaded, setuid support can be manually disabled for the local cell by running the following command as root fs setcell -cell -nosuid Following the application of this update, if you are certain there is no security risk of an attacker forging AFS fileserver responses, you can re-enable setuid status selectively with the following command, however this should not be done on sites that are visible to the Internet fs setcell -cell -suid For the stable distribution (sarge), this problem has been fixed in version 1.3.81-3sarge2. For the unstable distribution (sid) and the upcoming stable distribution (etch), this problem will be fixed in version 1.4.2-6. We recommend that you upgrade your openafs package. Fixed in: Debian GNU/Linux 3.1 (stable) Source: http://security.debian.org/pool/updates/main/o/openafs/openafs_1.3.81-3sarge2.dsc http://security.debian.org/pool/updates/main/o/openafs/openafs_1.3.81-3sarge2. diff.gz http://security.debian.org/pool/updates/main/o/openafs/openafs_1.3.81.orig.tar.gz Architecture-independent component: http://security.debian.org/pool/updates/main/o/openafs/openafs-modules-source_1.3. 81-3sarge2_all.deb Alpha: http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_alpha.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_alpha.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_alpha.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_alpha.deb http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_alpha.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_alpha.deb AMD64: http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_amd64.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_amd64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_amd64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_amd64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_amd64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_amd64.deb HP Precision: http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_hppa.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_hppa.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_hppa.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_hppa.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_hppa.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_hppa.deb Intel IA-32: http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_i386.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_i386.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_i386.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_i386.deb http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_i386.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_i386.deb Intel IA-64: http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81-3sarge2 _ia64.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81-3sarge2 _ia64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_ia64.deb http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_ia64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_ia64.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_ia64.deb PowerPC: http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_powerpc.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_powerpc.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_powerpc.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_powerpc.deb http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_powerpc.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_powerpc.deb IBM S/390: http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81-3 sarge2_s390.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_s390.deb http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_1 .3.81-3sarge2_s390.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_s390.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_s390.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_s390.deb Sun Sparc: http://security.debian.org/pool/updates/main/o/openafs/openafs-client_1.3.81- 3sarge2_sparc.deb http://security.debian.org/pool/updates/main/o/openafs/libpam-openafs-kaserver_ 1.3.81-3sarge2_sparc.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-fileserver_1.3.81- 3sarge2_sparc.deb http://security.debian.org/pool/updates/main/o/openafs/libopenafs-dev_1.3.81- 3sarge2_sparc.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-dbserver_1.3.81- 3sarge2_sparc.deb http://security.debian.org/pool/updates/main/o/openafs/openafs-kpasswd_1.3.81- 3sarge2_sparc.deb MD5 checksums of the listed files are available in the original advisory. [***** End Debian Security Advisory DSA-1271-1 *****] _______________________________________________________________________________ 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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