SSH Sentinel and Secure Shell BER/DER Decoding Vulnerability - Secunia Advisories - Vulnerability Intelligence

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SSH Sentinel and Secure Shell BER/DER Decoding Vulnerability
Secunia Advisory:	SA9904	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2003-10-02
Last Update:	2005-07-01
Popularity:	6,620 views

Critical:	Moderately critical
Impact:	DoS
Where:	From remote
Solution Status:	Vendor Patch

Software:	SSH Secure Shell for Servers 3.x SSH Secure Shell for Windows Servers 3.x SSH Secure Shell for Workstations 3.x SSH Sentinel 1.x

Subscribe:	Instant alerts on relevant vulnerabilities

Description: A vulnerability has been reported in SSH Secure Shell and SSH Sentinel, which can be exploited by malicious people to cause a DoS (Denial of Service) on a vulnerable system. The vulnerability is caused due to an error in the BER/DER decoding. This can be exploited by sending malformed BER/DER packets to a vulnerable system, which may cause it to crash. Servers are vulnerable if: * Certificate based authentication is used with the "Pki" definition in the configuration file. * Hostbased authentication for the server and the client is used. * The commercial or non-commercial version of the SSH Secure Shell Client for Windows is used. Server are not vulnerable if: * Only password authentication is used. * The non-commercial Unix distribution that does not contain the PKI functionality is used. * Public key authentication is allowed without specifying the "Pki" keyword in the server configuration file (sshd2_config). Solution: Update to SSH Secure Shell version 3.2.9 or SSH Sentinel version 1.4.1 build 98. SSH Secure Shell for Workstations 3.2: http://www.ssh.com/support/downloads/...hellwks/updates-and-packages-3-2.html SSH Secure Shell for Servers 3.2: http://www.ssh.com/support/downloads/...lserver/updates-and-packages-3-2.html SSH Secure Shell for Windows Servers 3.2: http://www.ssh.com/support/downloads/...nserver/updates-and-packages-3-2.html SSH Sentinel 1.4: http://www.ssh.com/support/downloads/sentinel/updates-and-packages-1-4.html Provided and/or discovered by: Reported by vendor. Changelog: 2005-07-01: Updated advisory. Original Advisory: SSH Communications Security: http://www.ssh.com/company/newsroom/article/476/ http://www.ssh.com/company/newsroom/article/477/

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