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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(HP Issues Fix for HP-UX Secure Shell) OpenSSH SSH v1 CRC Attack Detection Implementation Lets Remote Users Deny Service
SecurityTracker Alert ID:  1017335
SecurityTracker URL:  http://securitytracker.com/id/1017335
CVE Reference:   CVE-2006-4924   (Links to External Site)
Date:  Dec 5 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3 and prior versions
Description:   A vulnerability was reported in OpenSSH. A remote user can cause denial of service conditions.

A remote user can cause the target OpenSSH service to consume excessive CPU resources when SSH protocol version 1 is enabled.

The flaw resides in the CRC attack detection function in the processing of identical blocks.

Tavis Ormandy of the Google Security Team discovered this vulnerability.

Impact:   A remote user can cause the target service to consume excessive CPU resources.
Solution:   HP has issued fixes for HP Secure Shell (T1471AA), available at:

http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=T1471AA

HP-UX B.11.00 - HP-UX Secure Shell A.04.40.006
HP-UX B.11.11 - HP-UX Secure Shell A.04.40.006
HP-UX B.11.23 - HP-UX Secure Shell A.04.40.007

The HP advisory is available at:

http://www2.itrc.hp.com/service/cki/docDisplay.do?docId=c00815112

Vendor URL:  www.openssh.org/ (Links to External Site)
Cause:   State error
Underlying OS:  UNIX (HP/UX)
Underlying OS Comments:  11.00, 11.11, 11.23

Message History:   This archive entry is a follow-up to the message listed below.
Sep 26 2006 OpenSSH SSH v1 CRC Attack Detection Implementation Lets Remote Users Deny Service



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