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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(NetBSD Issues Fix) OpenSSH CBC Mode Error Handling May Let Certain Remote Users Obtain Plain Text in Certain Cases
SecurityTracker Alert ID:  1022488
SecurityTracker URL:  http://securitytracker.com/id/1022488
CVE Reference:   CVE-2008-5161   (Links to External Site)
Date:  Jul 1 2009
Impact:   Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.7p1, possibly other versions
Description:   A vulnerability was reported in OpenSSH. A remote user with control of the network can obtain portions of plain text in certain cases.

A remote user with control of the network between the client and the server can inject connection errors and monitor the SSH error handling response to recover up to 32 bits of plain text from an SSH-protected connection.

The attack process will terminate the SSH connection.

CBC mode connections are affected.

CTR mode connections are not affected.

Martin Albrecht, Kenny Paterson and Gaven Watson from the Information Security Group at Royal Holloway, University of London reported this vulnerability via the Centre for the Protection of National Infrastructure (CPNI).

The original advisory is available at:

http://www.cpni.gov.uk/Docs/Vulnerability_Advisory_SSH.txt

Impact:   A remote user with control of the network can obtain portions of plain text in certain cases.
Solution:   NetBSD has issued a fix.

The NetBSD advisory is available at:

http://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2009-005.txt.asc

Vendor URL:  www.openssh.org/txt/cbc.adv (Links to External Site)
Cause:   Randomization error
Underlying OS:  UNIX (NetBSD)
Underlying OS Comments:  4.0, 4.0.1, 5.0

Message History:   This archive entry is a follow-up to the message listed below.
Nov 17 2008 OpenSSH CBC Mode Error Handling May Let Certain Remote Users Obtain Plain Text in Certain Cases



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