__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Red Hat Updated kernel-utils Packages Fix setuid Vulnerability [RHSA-2003: 056-10] February 11, 2003 20:00 GMT Number N-044 ______________________________________________________________________________ PROBLEM: A vulnerability exists in the uml_net utility in the kernel-utils package that incorrectly sets its uid to the root user. PLATFORM: Red Hat Linux 8.0 DAMAGE: The vulnerability could allow local users to control certain network interfaces, add and remove arp entries and routes, and put interfaces in and out of promiscuous mode. SOLUTION: Apply updated packages as stated in Red Hat's bulletin. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. Local users must have a legitimate account ASSESSMENT: to escalate their privileges. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-044.shtml ORIGINAL BULLETIN: https://rhn.redhat.com/errata/RHSA-2003-056.html ______________________________________________________________________________ [***** Start RHSA-2003: 056-10 *****] Updated kernel-utils packages fix setuid vulnerability Advisory: RHSA-2003:056-10 Last updated on: 2003-02-07 Affected Products: Red Hat Linux 8.0 CVEs (cve.mitre.org): CAN-2003-0019 Security Advisory Details: An updated kernel-utils package is available that removes the setuid bits incorrectly assigned to the uml_net binary. The kernel-utils package contains several utilities that can be used to control the kernel or machine hardware. The uml_net utility, a user mode linux (UML) utility, in the kernel-utils packages that shipped with Red Hat Linux 8.0 incorrectly sets its uid to the root user. This could allow local users to control certain network interfaces, add and remove arp entries and routes, and put interfaces in and out of promiscuous mode. All users of the kernel-utils package should update to these errata packages which contain a version of uml_net which does not setuid root. Alternatively, as a work-around to this vulnerability, an administrator can issue the following command as root: chmod -s /usr/bin/uml_net Red Hat would like to thank Johnny Robertson for alerting us to this issue. Updated packages: Red Hat Linux 8.0 -------------------------------------------------------------------------------- SRPMS: kernel-utils-2.4-8.28.src.rpm [ via FTP ] [ via HTTP ] 6eac85b6523b2931db7d039b37b6a2e8 i386: kernel-utils-2.4-8.28.i386.rpm [ via FTP ] [ via HTTP ] 40a718a6037b55941a289fa6adc5f0f5 Solution Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] Note that this update is also available via Red Hat Network. Many people find this to be an easier way to apply updates. 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. Note that you must select kernel-utils explicitly on default configurations of up2date. Bugs fixed: (see bugzilla for more information) 83685 - uml_net executable allows users to do bad things References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0019 Keywords: linux, mode, uml, user -------------------------------------------------------------------------------- The listed packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/solutions/security/news/publickey.html#key You can verify each package and see who signed it with the following command: rpm --checksig -v filename If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: md5sum filename Note that you need RPM >= 3.0 to check GnuPG keys. The Red Hat security contact is security@redhat.com. More contact details at http://www.redhat.com/solutions/security/news/contact.html [***** End RHSA-2003: 056-10 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Red Hat, Inc. 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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