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SSH Tectia Products CBC Mode Plaintext Recovery Vulnerability
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Secunia Advisory:
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SA32740
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Release Date:
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2008-11-17
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Last Update:
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2008-11-25
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Popularity:
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1,623 views
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Critical:
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Less critical
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Impact:
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Exposure of sensitive information
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| Software: | SSH Tectia Client 4.x
SSH Tectia Client 5.x
SSH Tectia Client 6.x
SSH Tectia Connector 4.x
SSH Tectia Connector 5.x
SSH Tectia ConnectSecure 6.x
SSH Tectia Server 4.x
SSH Tectia Server 5.x
SSH Tectia Server 6.x
SSH Tectia Server for IBM z/OS 5.x
SSH Tectia Server for IBM z/OS 6.x
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Subscribe:
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| | CVE reference: | CVE-2008-5161
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Description:
A vulnerability has been reported in multiple SSH Tectia products, which potentially can be exploited by malicious people to disclose sensitive information.
The vulnerability is caused due to an error when handling errors within an SSH session encrypted with a block cipher algorithm in the CBC (Cipher-Block Chaining) mode. This can be exploited to potentially disclose up to 32 plaintext bits from an arbitrary block of ciphertext.
NOTE: An attack has a low probability of success, an attempt resulting in the termination of the current SSH session.
Successful exploitation requires that an attacker is able to read and alter network data.
The vulnerability affects the following products:
* SSH Tectia Client, Server, and ConnectSecure 6.0.4 and older in the 6.x series
* SSH Tectia Client, Server, and Connector 5.3.x versions 5.3.8 and prior
* SSH Tectia Client, Server, and Connector 5.x versions 5.2.4 and prior
* SSH Tectia Client, Server, and Connector 4.x versions 4.4.11 and prior
* SSH Tectia Server for Linux on IBM System z 6.0.4
* SSH Tectia Server for IBM z/OS 6.0.1 and 6.0.0
* SSH Tectia Server for IBM z/OS 5.5.1 and prior
* SSH Tectia Client 4.3.3-J (Japanese) and prior in the 4.x-J series
* SSH Tectia Client 4.3.10-K (Korean) and prior in the 4.x-K series
Solution:
Update to a fixed version.
https://downloads.ssh.com/
SSH Tectia Client, Server, and ConnectSecure:
Update to version 6.0.5.
SSH Tectia Client, Server, and Connector 5.3.x:
Update to version 5.3.9.
SSH Tectia Client, Server, and Connector 5.x:
Update to version 5.2.5.
SSH Tectia Client, Server, and Connector 4.x:
Update to version 4.4.12.
SSH Tectia Server for Linux on IBM System z:
Update to version 6.0.5.
SSH Tectia Server for IBM z/OS 6.x:
Update to version 6.0.2.
SSH Tectia Server for IBM z/OS 5.x:
Update to version 5.5.2.
SSH Tectia Client 4.x (Japanese):
Update to version 4.3.4-J.
Provided and/or discovered by:
Martin Albrecht, Kenny Paterson, and Gaven Watson from the Information Security Group at Royal Holloway, University of London, reported via CPNI
Changelog:
2008-11-21: Added CVE reference.
2008-11-25: Added link to US-CERT.
Original Advisory:
SSH Communications Security:
http://www.ssh.com/company/news/article/953/
Centre for the Protection of National Infrastructure (CPNI):
http://www.cpni.gov.uk/Docs/Vulnerability_Advisory_SSH.txt
Other References:
US-CERT VU#958563:
http://www.kb.cert.org/vuls/id/958563
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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8th Jan, 2009
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