__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SILC Vulnerabilities [Gentoo Linux Security Advisory GLSA 200804-27] April 28, 2008 18:00 GMT Number S-281 ______________________________________________________________________________ PROBLEM: Multiple vulnerabilities were found in SILC Client, Server, and Toolkit, allowing for Denial of Service and remote execution of arbitrary code. PLATFORM: SILC Toolkit 1.1.7 SILC Client 1.1.4 SILC Server 1.1.2 DAMAGE: Execute arbitrary code. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. A remote attacker could exploit these ASSESSMENT: vulnerabilities to cause a Denial of Service or execute arbitrary code with the privileges of the user running the application. ______________________________________________________________________________ CVSS 2 BASE SCORE: 7.5 TEMPORAL SCORE: 6.2 VECTOR: (AV:N/AC:L/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:C) ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-281.shtml ORIGINAL BULLETIN: http://www.securityfocus.com/archive/1/491279/30/0/threaded CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2008-1227 CVE-2008-1429 CVE-2008-1552 ______________________________________________________________________________ [***** Start Gentoo Linux Security Advisory GLSA 200804-27 *****] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200804-27 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: SILC: Multiple vulnerabilities Date: April 24, 2008 Bugs: #212362, #214116, #214812 ID: 200804-27 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities were found in SILC Client, Server, and Toolkit, allowing for Denial of Service and execution of arbitrary code. Background ========== SILC (Secure Internet Live Conferencing protocol) Toolkit is a software development kit for use in clients, SILC Server is a communication server, and SILC Client is an IRSSI-based text client. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-im/silc-toolkit < 1.1.7 >= 1.1.7 2 net-im/silc-client < 1.1.4 >= 1.1.4 3 net-im/silc-server < 1.1.2 >= 1.1.2 ------------------------------------------------------------------- 3 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description =========== * Nathan G. Grennan reported a boundary error in SILC Toolkit within the silc_fingerprint() function in the file lib/silcutil/silcutil.c when passing overly long data, resulting in a stack-based buffer overflow (CVE-2008-1227). * A vulnerability has been reported in SILC Server which is caused due to an error in the handling of "NEW_CLIENT" packets that do not contain a nickname (CVE-2008-1429). * Ariel Waissbein, Pedro Varangot, Martin Mizrahi, Oren Isacson, Carlos Garcia, and Ivan Arce of Core Security Technologies reported that SILC Client, Server, and Toolkit contain a vulnerability in the silc_pkcs1_decode() function in the silccrypt library (silcpkcs1.c), resulting in an integer underflow, signedness error, and a buffer overflow (CVE-2008-1552). Impact ====== A remote attacker could exploit these vulnerabilities to cause a Denial of Service or execute arbitrary code with the privileges of the user running the application. Workaround ========== There is no known workaround at this time. Resolution ========== All SILC Toolkit users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-im/silc-toolkit-1.1.7" All SILC Client users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-im/silc-client-1.1.4" All SILC Server users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-im/silc-server-1.1.2" References ========== [ 1 ] CVE-2008-1227 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1227 [ 2 ] CVE-2008-1429 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1429 [ 3 ] CVE-2008-1552 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1552 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200804-27.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security (at) gentoo (dot) org [email concealed] or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2008 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5 [***** End Gentoo Linux Security Advisory GLSA 200804-27 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Gentoo 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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