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TITLE:
SSH Tectia Products CBC Mode Plaintext Recovery Vulnerability

SECUNIA ADVISORY ID:
SA32740

VERIFY ADVISORY:
http://secunia.com/advisories/32740/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
>From local network

SOFTWARE:
SSH Tectia Server for IBM z/OS 5.x
http://secunia.com/advisories/product/12303/
SSH Tectia Server 5.x
http://secunia.com/advisories/product/6528/
SSH Tectia Server 4.x
http://secunia.com/advisories/product/3233/
SSH Tectia Client 5.x
http://secunia.com/advisories/product/12301/
SSH Tectia Client 4.x
http://secunia.com/advisories/product/3234/
SSH Tectia Client 6.x
http://secunia.com/advisories/product/20505/
SSH Tectia Connector 4.x
http://secunia.com/advisories/product/20508/
SSH Tectia Connector 5.x
http://secunia.com/advisories/product/20509/
SSH Tectia ConnectSecure 6.x
http://secunia.com/advisories/product/20507/
SSH Tectia Server 6.x
http://secunia.com/advisories/product/20506/
SSH Tectia Server for IBM z/OS 6.x
http://secunia.com/advisories/product/20510/

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

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

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