__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN RealPlayer Playlist Vulnerability [US-CERT Vulnerability Note VU#871673] October 23, 2007 12:00 GMT Number S-023 ______________________________________________________________________________ PROBLEM: RealPlayer contains a stack buffer overflow in the handling of playlist names, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. NOTE--Please see US-CERT SAR-07-0292-01-RealPlayer Zero-day on the CIAC AWARE Portal. PLATFORM: RealOne Player RealOne Player v2 RealPlayer 10 DAMAGE: Can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. SOLUTION: Upgrade to the appropriate version and apply the security patch. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. Can allow a remote, unauthenticated ASSESSMENT: attacker to execute arbitrary code on a vulnerable system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-023.shtml ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/871673 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-5601 ______________________________________________________________________________ [***** Start US-CERT Vulnerability Note VU#871673 *****] Vulnerability Note VU#871673 RealPlayer playlist name stack buffer overflow Overview RealPlayer contains a stack buffer overflow in the handling of playlist names, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. I. Description RealNetworks RealPlayer is a multimedia application that allows users to view local and remote audio/video content. The RealPlayer Database Component, which is provided by MPAMedia.dll, contains a stack buffer overflow in the handling of playlist names. The RealPlayer IERPCtl ActiveX control, which is provided by ierpplug.dll, can be used to import a local file into a specified playlist in RealPlayer. This can be used to trigger the buffer overflow vulnerability. The ActiveX control is present in RealPlayer version 9 (RealOne Player) and later. II. Impact By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), a remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user on a vulnerable system. III. Solution Apply an update Please see the Security Update from RealNetworks. The update will provide newer versions of the RealPlayer Database Component for RealPlayer 10.5 and RealPlayer 11 beta. Users with RealOne Player, RealOne Player v2 or RealPlayer 10 should first update to RealPlayer 10.5 or later and then apply the security update. Disable the IERPCtl ActiveX control in Internet Explorer The ActiveX control that can be used as an attack vector can be disabled in Internet Explorer by setting the kill bit for the following CLSID: {FDC7A535-4070-4B92-A0EA-D9994BCC0DC5} More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\ {FDC7A535-4070-4B92-A0EA-D9994BCC0DC5}] "Compatibility Flags"=dword:00000400 Disable ActiveX Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document. Systems Affected Vendor Status Date Updated RealNetworks, Inc. Vulnerable 20-Oct-2007 References http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer http://service.real.com/realplayer/security/191007_player/en/ http://www.securityfocus.com/bid/26130 http://www.symantec.com/enterprise/security_response/weblog/2007/10/realplayer_ exploit_on_the_loos.html http://support.microsoft.com/kb/240797 Credit This vulnerability was analyzed and confirmed by US-CERT on October 13, 2007. This document was written by Will Dormann. Other Information Date Public 10/18/2007 Date First Published 10/20/2007 10:25:17 AM Date Last Updated 10/21/2007 CERT Advisory CVE Name CVE-2007-5601 Metric 34.02 Document Revision 19 [***** End US-CERT Vulnerability Note VU#871673 *****] _______________________________________________________________________________ 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. 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