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SSH Sentinel and Secure Shell BER/DER Decoding Vulnerability
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Secunia Advisory:
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SA9904
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Release Date:
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2003-10-02
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Last Update:
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2005-07-01
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Popularity:
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7,645 views
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| 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
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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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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).
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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