__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Avast! Antivirus Vulnerability [US-CERT Vulnerability Note VU#125868] May 29, 2007 18:00 GMT Number R-249 ______________________________________________________________________________ PROBLEM: Avast! antivirus contains a buffer overflow vulnerability. This vulnerability may allow an attacker to execute arbitrary code on a vulnerable system. PLATFORM: Avast! 4.7.6 DAMAGE: May allow an attacker to execute arbitrary code on a vulnerable system. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. May allow an attacker to execute arbitrary ASSESSMENT: code on a vulnerable system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-249.shtml ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/125868 ______________________________________________________________________________ [***** Start US-CERT Vulnerability Note VU#125868 *****] Vulnerability Note VU#125868 Avast! antivirus buffer overflow vulnerability Overview Avast! antivirus contains a buffer overflow vulnerability. This vulnerability may allow an attacker to execute code a vulnerable system. I. Description Avast! antivirus is an antivirus application that can scan different types of files. The Symbian Installer Format (SIS) file format is used by the Symbian OS to package files for distribution to mobile devices. Avast! antivirus contains a buffer overflow vulnerability. By convincing a user to scan a specially crafted SIS file with a vulnerable version of Avast! antivirus, an attacker may be able to trigger the overflow. II. Impact A remote unauthenticated attacker may be able to execute arbitrary code, or create a denial-of-service condition. III. Solution Update Version 4.7.700 has been released to address this issue. Users are encouraged to update as soon as possible. Systems Affected Vendor Status Date Updated Avast! Antivirus Software Vulnerable 29-May-2007 References http://www.avast.com/eng/adnm-management-client-revision-history.html http://www.avast.com/eng/search.php?searchFor=sergio+alvarez http://www.nruns.com/security_advisory.php http://www.symbian.com/Developer/techlib/v70sdocs/doc_source/ToolsAndUtilities /Installing-ref/PackageFileFormatReference.guide.html Credit Thanks to Sergio Alvarez of n.runs AG and Avast! for information that was used in this report. This document was written by Ryan Giobbi. Other Information Date Public 05/25/2007 Date First Published 05/29/2007 08:28:54 AM Date Last Updated 05/29/2007 CERT Advisory CVE Name Metric 1.15 Document Revision 5 [***** End US-CERT Vulnerability Note VU#125868 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of US-CERT 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. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) R-240: Samba Security Update R-241: CA Anti-Virus for the Enterprise Securitiy Notice R-242: Security Vulnerability in Sun Remote Services (SRS) Net Connect Software R-243: Tomcat Security Update R-244: OPeNDAP Vulnerability CIACTech07-001: MOICE - Microsoft Office Isolated Conversion Environment R-245: Vulnerability in Crypto Library R-246: Multiple Vulnerabilities in Cisco IOS while Processing SSL Packets R-247: Apple Security Update 2007-005 R-248: Security Vulnerabilities in the SOCKS Module of Sun Java System Web Proxy