__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN GnuTLS Security Update [Red Hat RHSA-2008:0489-5] May 22, 2008 13:00 GMT Number S-296 ______________________________________________________________________________ PROBLEM: Flaws were found in the way GnuTLS handles malicious client connections and it is possible to leverage this flaw to execute arbitrary code. PLATFORM: RHEL Desktop Workstation (v. 5 client) Red Hat Enterprise Linux (v. 5 server) Red Hat Enterprise Linux Desktop (v. 5 client) DAMAGE: DoS and possible execute arbitrary code. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. A malicious remote client could sent a ASSESSMENT: specially crafted request to a service using GnuTLS that could cause the service to crash and it may be possible to execute arbitrary code but they have been unable to prove this at the time of releasing this advisory. ______________________________________________________________________________ CVSS 2 BASE SCORE: 7.5 TEMPORAL SCORE: 5.5 VECTOR: (AV:N/AC:L/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:C) ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-296.shtml ORIGINAL BULLETIN: https://rhn.redhat.com/errata/RHSA-2008-0489.html ADDITIONAL LINK: http://www.debian.org/security/2008/dsa-1581 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2008-1948 CVE-2008-1949 CVE-2008-1950 ______________________________________________________________________________ [***** Start Red Hat RHSA-2008:0489-5 *****] Critical: gnutls security update Advisory: RHSA-2008:0489-5 Type: Security Advisory Severity: Critical Issued on: 2008-05-20 Last updated on: 2008-05-20 Affected Products: RHEL Desktop Workstation (v. 5 client) Red Hat Enterprise Linux (v. 5 server) Red Hat Enterprise Linux Desktop (v. 5 client) OVAL: com.redhat.rhsa-20080489.xml CVEs (cve.mitre.org): CVE-2008-1948 CVE-2008-1949 CVE-2008-1950 Details Updated gnutls packages that fix several security issues are now available for Red Hat Enterprise Linux 5. This update has been rated as having critical security impact by the Red Hat Security Response Team. The GnuTLS Library provides support for cryptographic algorithms and protocols such as TLS. GnuTLS includes libtasn1, a library developed for ASN.1 structures management that includes DER encoding and decoding. Flaws were found in the way GnuTLS handles malicious client connections. A malicious remote client could send a specially crafted request to a service using GnuTLS that could cause the service to crash. (CVE-2008-1948, CVE-2008-1949, CVE-2008-1950) We believe it is possible to leverage the flaw CVE-2008-1948 to execute arbitrary code but have been unable to prove this at the time of releasing this advisory. Red Hat Enterprise Linux 5 includes applications, such as CUPS, that would be directly vulnerable to any such an exploit, however. Consequently, we have assigned it critical severity. Users of GnuTLS are advised to upgrade to these updated packages, which contain a backported patch that corrects these issues. Solution Before applying this update, make sure that all previously-released errata relevant to your system have been applied. This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/FAQ_58_10188 Updated packages RHEL Desktop Workstation (v. 5 client) -------------------------------------------------------------------------------- IA-32: gnutls-devel-1.4.1-3.el5_1.i386.rpm ff85af9e0a921178b695b64153083d12 x86_64: gnutls-devel-1.4.1-3.el5_1.i386.rpm ff85af9e0a921178b695b64153083d12 gnutls-devel-1.4.1-3.el5_1.x86_64.rpm 3fcc5ceec14e94c259e2eaa5492e2318 Red Hat Enterprise Linux (v. 5 server) -------------------------------------------------------------------------------- SRPMS: gnutls-1.4.1-3.el5_1.src.rpm c7dbb04e62bcfd67c877b4fd9f91be82 IA-32: gnutls-1.4.1-3.el5_1.i386.rpm d737d8916b444881dd6907dcbd2d20bd gnutls-devel-1.4.1-3.el5_1.i386.rpm ff85af9e0a921178b695b64153083d12 gnutls-utils-1.4.1-3.el5_1.i386.rpm 8f99afe7eb5f06b0fb4670ede2d4c4f5 IA-64: gnutls-1.4.1-3.el5_1.i386.rpm d737d8916b444881dd6907dcbd2d20bd gnutls-1.4.1-3.el5_1.ia64.rpm 03f46b391136c0cef9b79712ff0bf95b gnutls-devel-1.4.1-3.el5_1.ia64.rpm 337f7512e7e832dd88af0b76461368a6 gnutls-utils-1.4.1-3.el5_1.ia64.rpm 105c019612f102bf879be0e53206d51a PPC: gnutls-1.4.1-3.el5_1.ppc.rpm 9c158fa98dbd772c53a2db14de63695c gnutls-1.4.1-3.el5_1.ppc64.rpm 35e32620c694072dc75ebcf83a702cf0 gnutls-devel-1.4.1-3.el5_1.ppc.rpm fbaba59726e29eb39a58e3b5bec39cde gnutls-devel-1.4.1-3.el5_1.ppc64.rpm 9224f8ffc26c1aebad1a464d380c846f gnutls-utils-1.4.1-3.el5_1.ppc.rpm 7d3508555a4505ac2e8b93b159cc588f s390x: gnutls-1.4.1-3.el5_1.s390.rpm 3a3a097ac6895e04733bf5ba2a77a238 gnutls-1.4.1-3.el5_1.s390x.rpm 0c4accd1300e9778f64ea65f06d94b37 gnutls-devel-1.4.1-3.el5_1.s390.rpm 0b3ee4d9213ba4eb85ce857cc56e22be gnutls-devel-1.4.1-3.el5_1.s390x.rpm cdf5e42f1f7b0e6e187cf01f4637c2f8 gnutls-utils-1.4.1-3.el5_1.s390x.rpm ecd0b113e21771c0b470d01cb580650a x86_64: gnutls-1.4.1-3.el5_1.i386.rpm d737d8916b444881dd6907dcbd2d20bd gnutls-1.4.1-3.el5_1.x86_64.rpm 5a284211f10479f2b78a8197119a37a1 gnutls-devel-1.4.1-3.el5_1.i386.rpm ff85af9e0a921178b695b64153083d12 gnutls-devel-1.4.1-3.el5_1.x86_64.rpm 3fcc5ceec14e94c259e2eaa5492e2318 gnutls-utils-1.4.1-3.el5_1.x86_64.rpm f4d83a41709bcf86f4dd888eb49bfe83 Red Hat Enterprise Linux Desktop (v. 5 client) -------------------------------------------------------------------------------- SRPMS: gnutls-1.4.1-3.el5_1.src.rpm c7dbb04e62bcfd67c877b4fd9f91be82 IA-32: gnutls-1.4.1-3.el5_1.i386.rpm d737d8916b444881dd6907dcbd2d20bd gnutls-utils-1.4.1-3.el5_1.i386.rpm 8f99afe7eb5f06b0fb4670ede2d4c4f5 x86_64: gnutls-1.4.1-3.el5_1.i386.rpm d737d8916b444881dd6907dcbd2d20bd gnutls-1.4.1-3.el5_1.x86_64.rpm 5a284211f10479f2b78a8197119a37a1 gnutls-utils-1.4.1-3.el5_1.x86_64.rpm f4d83a41709bcf86f4dd888eb49bfe83 (The unlinked packages above are only available from the Red Hat Network) Bugs fixed (see bugzilla for more information) 447461 - CVE-2008-1948 GNUTLS-SA-2008-1-1 GnuTLS buffer overflow 447462 - CVE-2008-1949 GNUTLS-SA-2008-1-2 GnuTLS null-pointer dereference 447463 - CVE-2008-1950 GNUTLS-SA-2008-1-3 GnuTLS memory overread flaw References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1948 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1949 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1950 http://www.redhat.com/security/updates/classification/#critical -------------------------------------------------------------------------------- These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from: https://www.redhat.com/security/team/key/#package The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/ [***** End Red Hat RHSA-2008:0489-5 *****] _______________________________________________________________________________ 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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