__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Potential Buffer Overflows in WinZip [WinZip 9.0 Service Release 1 (SR-1)] September 7, 2004 20:00 GMT Number O-211 ______________________________________________________________________________ PROBLEM: WinZip contains potential buffer overflows. PLATFORM: WinZip 9.0 and earlier DAMAGE: Unspecified potential buffer overflows, including one that could be triggered by specially-crafted invalid input on the WinZip command line. SOLUTION: Upgrade to WinZip 9.0 Service Release 1 ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. A local user may be misled into executing ASSESSMENT: arbitrary code. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/o-211.shtml ORIGINAL BULLETIN: http://www.winzip.com/wz90sr1.htm ADDITIONAL LINK: Security Tracker Alert ID: 1011132 http://securitytracker.com/id?1011132 PATCHES: http://www.winzip.com/downauto.cgi?winzip90.exe ______________________________________________________________________________ [Start of WinZip 9.0 Service Release 1 (SR-1) FAQs] WinZip 9.0 Service Release 1 (SR-1) Q: What is WinZip 9.0 SR-1? A: WinZip 9.0 Service Release 1 (SR-1) is a maintenance release of WinZip 9.0 containing important security-related fixes and improvements to WinZip. It was posted on the WinZip web site on August 26, 2004. WinZip Computing, Inc. recommends that users of all earlier versions of WinZip, including users of the initial release of WinZip 9.0, upgrade to WinZip 9.0 SR-1. Q: What has changed in WinZip 9.0 SR-1? A: The main changes in WinZip 9.0 SR-1 include: A number of general internal improvements have been made to the WinZip program to enhance security and reliability. In the course of its internal review and testing, WinZip Computing also identified and addressed some specific cases where security vulnerabilities, including potential buffer overflows, existed in previous versions of WinZip. As of the release of WinZip 9.0 SR-1, WinZip Computing was not aware that any of these vulnerabilities had been publicly described or exploited. However, WinZip Computing recommends that all WinZip users upgrade to WinZip 9.0 SR-1 to avoid the possibility of future exploitation of these vulnerabilities. WinZip 9.0 SR-1 also addresses a buffer overflow issue privately reported by a WinZip user that could be triggered by specially-crafted invalid input on the WinZip command line. As of the release of WinZip 9.0 SR-1, WinZip Computing was not aware of this vulnerability being exploited, and believes that exploitation would only be likely on a system whose security had already been compromised in some other way. The main visible change in WinZip 9.0 SR-1 is that WinZip now displays caution messages in some situations, such as when a user double-clicks on a .EXE file compressed within a Zip file, to warn that the compressed file has a file type that could potentially contain a virus. WinZip users who frequently need to work with the file types involved can easily turn the caution messages off. WinZip Computing has also released WinZip Command-Line Support Add-On 1.1 SR-1. Users of the WinZip Command-Line Support Add-On should also upgrade to this maintenance release, because it contains important security-related fixes and improvements similar to those in WinZip 9.0 SR-1. Q: How do I know whether I already have WinZip 9.0 SR-1? A: You can check to see what release of WinZip is currently installed by displaying WinZip's About box as follows: In WinZip Classic mode, click About WinZip from the Help menu In WinZip Wizard mode, click on the About button If WinZip 9.0 SR-1 is installed, the line with version information will start out with the following text: WinZip 9.0 SR-1 If you do not have WinZip 9.0 SR-1, please see the WinZip Upgrade Information Page. Q: How can I download a copy of WinZip 9.0 SR-1? A: For instructions on downloading WinZip 9.0 SR-1, please refer to the WinZip Upgrade Information Page. Acknowledgements: We thank WinZip user NoRpiUs for alerting us to the issue involving invalid input to the WinZip command line. [End of WinZip 9.0 Service Release 1 (SR-1) FAQs] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of WinZip 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. 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