__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN F-Secure AV for MS Exchange and Internet Gatekeeper Vulnerability [F-Secure Security Bulletin FSC-2005-2] November 4, 2005 18:00 GMT Number Q-042 ______________________________________________________________________________ PROBLEM: Limited vulnerabilities were discovered in F-Secures Anti-Virus for Microsoft Exchange and F-Secure's Internet Gatekeeper. PLATFORM: F-Secure Anti-Virus for Microsoft Exchange 6.40 F-Secure Internet Gatekeeper 6.42, 6.41, 6.40 DAMAGE: A limited directory traversal vulnerability can be exploited by bypassing the Web Console authentication. It is possible to gain a read access to a file on the local disk from allowed hosts. By default the connections are only allowed from the local host. SOLUTION: Apply the available security updates. ______________________________________________________________________________ VULNERABILITY The risk is LOW. An attacker may gain read access to a file on ASSESSMENT: the local disk. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-042.shtml ORIGINAL BULLETIN: http://www.f-secure.com/security/fsc-2005-2.shtml ______________________________________________________________________________ [***** Start F-Secure Security Bulletin FSC-2005-2 *****] F-Secure Security Bulletin FSC-2005-2 Limited Directory Traversal Vulnerability in F-Secure Anti-Virus for Microsoft Exchange and F-Secure Internet Gatekeeper Date issued 2005-11-02 Risk factor Low/Medium (Low/Medium/High/Critical) Brief description A limited directory traversal vulnerability can be exploited by bypassing the Web Console authentication. It is possible to gain a read access to a file on the local disk from allowed hosts. By default the connections are only allowed from the local host. To solve the problem apply the appropriate hotfix. Software F-Secure Anti-Virus for Microsoft Exchange and F-Secure Internet Gatekeeper Affected versions F-Secure Anti-Virus for Microsoft Exchange 6.40 F-Secure Internet Gatekeeper 6.42, 6.41, 6.40 Affected platforms All platforms supported by the affected products Bulletin location http://www.f-secure.com/security/fsc-2005-2.shtml Issue: A limited directory traversal vulnerability can be exploited by bypassing the Web Console authentication. It is possible to gain a read access to a file on the local disk from allowed hosts. By default the connections are only allowed from the local host. To solve the problem apply the appropriate hotfix. ------------------------------------------------------------------------------- - Products: F-Secure Anti-Virus for Microsoft Exchange 6.40 F-Secure Internet Gatekeeper 6.42 Scenario 1: Default configuration. Web Console is configured by default to accept connections only from the local host. Risk Factor: Low There is a possibility to exploit the limited directory traversal vulnerability from the local host. To solve the problem apply the appropriate hotfix. ------------------------------------------------------------------------------- - Scenario 2: If Web Console is configured to allow connections from specific/trusted hosts. Risk Factor: Low There is a possibility to exploit the limited directory traversal vulnerability from those hosts that the connections are allowed from. To solve the problem apply the appropriate hotfix. ------------------------------------------------------------------------------- - Scenario 3: If the Web Console is configured to allow connections from all hosts. Risk Factor: Medium There is a possibility to exploit the limited directory traversal vulnerability from all hosts. To solve the problem apply the appropriate hotfix. ------------------------------------------------------------------------------- - Products: F-Secure Internet Gatekeeper 6.41, 6.40 Risk Factor: Low These versions contain the vulnerability but upgrading to the latest released versions and applying the hotfix will solve the issue. F-Secure recommends upgrading to the latest released versions of the products: F-Secure Anti-Virus for Microsoft Exchange 6.40 and F-Secure Internet Gatekeeper 6.42. ------------------------------------------------------------------------------- - Mitigating Factors: This is not considered to be a major issue because Web Console for F-Secure Anti-Virus for Microsoft Exchange and F-Secure Internet Gatekeeper are configured by default to accept local host connections only meaning that it is possible to access the Web Console only from the local machine. It is not possible to browse the file system. The attacker must be aware of the path and the file name to be able to access a file. The access rights gained are very limited. It is possible to gain only a read access to a file on the local disk. Patch Availability: Product Versions Hotfix ID Download F-Secure Anti-Virus for Microsoft Exchange 6.40 Hotfix for F-Secure Anti-Virus for Microsoft Exchange 6.40: ftp://ftp.f-secure.com/support/hotfix/fsav-mse/fsavmse640-01.zip F-Secure Internet Gatekeeper 6.42 Hotfix for the F-Secure Internet Gatekeeper 6.42: ftp://ftp.f-secure.com/support/hotfix/fsig/fsigk642-01.zip F-Secure Internet Gatekeeper 6.41, 6.40 Upgrade: F-Secure Internet Gatekeeper 6.42: http://www.f-secure.com/anti-virus/webclub/fsigk.shtml AND Hotfix: see above. Credits: We thank Mikko Korppi for bringing this issue to our attention. Revision History: FSC-2005-2 - 2005-11-02 Contact Information: Support: http://support.f-secure.com/enu/home/contactus/ Security: http://www.f-secure.com/security/ URL: http://www.f-secure.com/ [***** End F-Secure Security Bulletin FSC-2005-2 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of F-Secure 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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