__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN RealNetworks Players SMIL "Wallclock" Vulnerability [US-CERT Vulnerability Note VU#770904] June 28, 2007 18:00 GMT Number R-288 ______________________________________________________________________________ PROBLEM: A buffer overflow in RealNetworks media players could allow a remote attacker to execute arbitrary code on an affected system. PLATFORM: RealNetworks RealPlayer and HelixPlayer 10.5-GOLD DAMAGE: Could allow a remote attacker to execute arbitrary code on an affected system. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An intruder who could induce a user to open ASSESSMENT: a crafted media file could run arbitrary code as the user. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-288.shtml ORIGINAL BULLETIN: http://docs.info.apple.com/article.html?artnum=305102 ADDITIONAL LINK: https://rhn.redhat.com/errata/RHSA-2007-0605.html CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-3410 ______________________________________________________________________________ [***** Start US-CERT Vulnerability Note VU#770904 *****] Vulnerability Note VU#770904 RealNetworks players SMIL "wallclock" buffer overflow Overview A buffer overflow in RealNetworks media players could allow a remote attacker to execute arbitrary code on an affected system. I. Description The RealNetworks RealPlayer and Helix Player applications allow users to view local and remote audio and video content. These players support multiple media formats including the synchronized multimedia integration language (SMIL). A stack-based buffer overflow exists in the way that these players handle the "wallclock-sync" values encoded in the SMIL data. A remote attacker with the ability to supply a specially crafted media file or stream could exploit this vulnerability to execute arbitrary code on an affected system. Note that we are aware of publicly-available exploit code for this vulnerability. II. Impact A remote unauthenticated attacker could execute arbitrary code with the privileges of the user running a vulnerable application or cause the vulnerable application to crash, resulting in a denial of service. III. Solution Apply an update from the vendor The latest versions of the affected software available at the time of this writing are reported to contain a patch for this issue. Users of RealPlayer are encouraged to take the following steps to update: Windows users are encouraged to follow the steps outlined in RealNetworks support document Answer ID 6929 RealPlayer for Mac OS X users should take the following steps: 1. Go the RealPlayer menu. 2. Choose Check for Update. 3. Select the box next to the "RealPlayer 10 Latest Release" component. 4. Click Install to download and install the update Systems Affected Vendor Status Date Updated RealNetworks, Inc. Vulnerable 28-Jun-2007 Red Hat, Inc. Vulnerable 27-Jun-2007 References http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=547 Credit This vulnerability was reported by iDefense Labs in iDefense Labs Public Advisory: 06.26.07. iDefense credits an anonymous researcher with reporting this vulnerability to them. This document was written by Chad R Dougherty. Other Information Date Public 06/26/2007 Date First Published 06/28/2007 10:22:06 AM Date Last Updated 06/28/2007 CERT Advisory CVE Name CVE-2007-3410 Metric 22.27 Document Revision 5 [***** End US-CERT Vulnerability Note VU#770904 *****] _______________________________________________________________________________ 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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