__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN vixie-cron Security Update [RHSA-2006:0539-9] July 13, 2006 23:00 GMT Number Q-247 ______________________________________________________________________________ PROBLEM: A privilege escalation flaw was found in the way Vixie Cron runs programs; vixie-cron does not properly verify an attempt to set the current process user id succeeded. PLATFORM: Red Hat Desktop (v. 4) Red Hat Enterprise Linux AS (v. 4) Red Hat Enterprise Linux ES (v. 4) Red Hat Enterprise Linux WS (v. 4) DAMAGE: It was possible for a malicious local users who exhausted certain limits to execute arbitrary commands as root via cron. SOLUTION: Apply current patches. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. A local user can run commands as root. ASSESSMENT: ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-247.shtml ORIGINAL BULLETIN: https://rhn.redhat.com/errata/RHSA-2006-0539.html CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2607 ______________________________________________________________________________ [***** Start RHSA-2006:0539-9 *****] Important: vixie-cron security update Advisory: RHSA-2006:0539-9 Type: Security Advisory Issued on: 2006-07-12 Last updated on: 2006-07-12 Affected Products: Red Hat Desktop (v. 4) Red Hat Enterprise Linux AS (v. 4) Red Hat Enterprise Linux ES (v. 4) Red Hat Enterprise Linux WS (v. 4) CVEs (cve.mitre.org): CVE-2006-2607 Details Updated vixie-cron packages that fix a privilege escalation issue are now available. This update has been rated as having important security impact by the Red Hat Security Response Team. The vixie-cron package contains the Vixie version of cron. Cron is a standard UNIX daemon that runs specified programs at scheduled times. A privilege escalation flaw was found in the way Vixie Cron runs programs; vixie-cron does not properly verify an attempt to set the current process user id succeeded. It was possible for a malicious local users who exhausted certain limits to execute arbitrary commands as root via cron. (CVE-2006-2607) All users of vixie-cron should upgrade to these updated packages, which contain a backported patch to correct this issue. Solution Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Updated packages Red Hat Desktop (v. 4) SRPMS: vixie-cron-4.1-44.EL4.src.rpm 84ffd65a8877af47400a731ecd1b9ee3 IA-32: vixie-cron-4.1-44.EL4.i386.rpm 96f8e56c7683001feb3f3af160e5d3bc x86_64: vixie-cron-4.1-44.EL4.x86_64.rpm 3d045241d3453e8bc5a6bc260320fbc9 Red Hat Enterprise Linux AS (v. 4) SRPMS: vixie-cron-4.1-44.EL4.src.rpm 84ffd65a8877af47400a731ecd1b9ee3 IA-32: vixie-cron-4.1-44.EL4.i386.rpm 96f8e56c7683001feb3f3af160e5d3bc IA-64: vixie-cron-4.1-44.EL4.ia64.rpm a8d8d2c094a1d9aa1e8b565633f63491 PPC: vixie-cron-4.1-44.EL4.ppc.rpm abbfe3611ef001871714d508cb12ee78 s390: vixie-cron-4.1-44.EL4.s390.rpm 13a5b37c0c9c360055a75c3b779603c9 s390x: vixie-cron-4.1-44.EL4.s390x.rpm 869131c337de109964f8acb2e720ee33 x86_64: vixie-cron-4.1-44.EL4.x86_64.rpm 3d045241d3453e8bc5a6bc260320fbc9 Red Hat Enterprise Linux ES (v. 4) SRPMS: vixie-cron-4.1-44.EL4.src.rpm 84ffd65a8877af47400a731ecd1b9ee3 IA-32: vixie-cron-4.1-44.EL4.i386.rpm 96f8e56c7683001feb3f3af160e5d3bc IA-64: vixie-cron-4.1-44.EL4.ia64.rpm a8d8d2c094a1d9aa1e8b565633f63491 x86_64: vixie-cron-4.1-44.EL4.x86_64.rpm 3d045241d3453e8bc5a6bc260320fbc9 Red Hat Enterprise Linux WS (v. 4) SRPMS: vixie-cron-4.1-44.EL4.src.rpm 84ffd65a8877af47400a731ecd1b9ee3 IA-32: vixie-cron-4.1-44.EL4.i386.rpm 96f8e56c7683001feb3f3af160e5d3bc IA-64: vixie-cron-4.1-44.EL4.ia64.rpm a8d8d2c094a1d9aa1e8b565633f63491 x86_64: vixie-cron-4.1-44.EL4.x86_64.rpm 3d045241d3453e8bc5a6bc260320fbc9 (The unlinked packages above are only available from the Red Hat Network) Bugs fixed (see bugzilla for more information) 193146 - CVE-2006-2607 Jobs start from root when pam_limits enabled References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2607 http://www.redhat.com/security/updates/classification/#important [***** End RHSA-2006:0539-9 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Red Hat 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. 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