__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SSH Tectia Client and Server Vulnerability [US-CERT Vulnerability Note VU#921339] January 11, 2008 19:00 GMT Number S-112 ______________________________________________________________________________ PROBLEM: The SSH Communications Security Tectia Client and Server products are vulnerable to privilege escalation, which may allow a local user to gain root access. PLATFORM: SSH Tectia Client SSH Tectia Server 5.0, 5.1, 5.2, and 5.3 up to 5.2.3 and 5.3.5 (all Linux and Unix) DAMAGE: May allow a local user to gain root access. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. May allow a local user to gain root access. ASSESSMENT: ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-112.shtml ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/921339 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-5616 ______________________________________________________________________________ [***** Start US-CERT Vulnerability Note VU#921339 *****] Vulnerability Note VU#921339 SSH Tectia Client and Server ssh-signer local privilege escalation Overview The SSH Communications Security Tectia Client and Server products are vulnerable to privilege escalation, which may allow a local user to gain root access. I. Description The SSH Tectia Client and Server products contain an unspecified privilege escalation vulnerability in ssh-signer. A local user may be able to obtain root access. According to SSH Communications Security: AFFECTED PRODUCTS * SSH Tectia client and SSH Tectia Server 5.0, 5.1, 5.2 and 5.3 up to 5.2.3 and 5.3.5 (all Linux and Unix) NOT AFFECTED PRODUCTS * 4.x or older SSH Tectia client/server solution versions are NOT affected. * Any version of SSH Tectia client/server solution for IBM mainframes is NOT affected. * Any version of SSH Tectia client/server solution for Windows is NOT affected. II. Impact A local user may be able to obtain root access. III. Solution Apply an update This issue is addressed in SSH Tectia Client/Server solution 5.2.4 and 5.3.6. Remove ssh-signer This vulnerability can be mitigated by removing the ssh-signer binary, which is located in /opt/tectia/libexec/. Note that this will disable host-based authentication of the SSH Tectia Client. This will have no adverse effect on SSH Tectia Server. Systems Affected Vendor Status Date Updated SSH Communications Security Corp Vulnerable 8-Jan-2008 References http://www.ssh.com/products/client-server/ Credit Thanks to Tuomas Siren for reporting this vulnerability. This document was written by Will Dormann. Other Information Date Public 01/08/2008 Date First Published 01/08/2008 09:57:36 AM Date Last Updated 01/08/2008 CERT Advisory CVE Name CVE-2007-5616 Metric 2.25 Document Revision 4 [***** End US-CERT Vulnerability Note VU#921339 *****] _______________________________________________________________________________ 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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