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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(OpenBSD Issues Fix) OpenSSH SSH v1 CRC Attack Detection Implementation Lets Remote Users Deny Service
SecurityTracker Alert ID:  1017052
SecurityTracker URL:  http://securitytracker.com/id/1017052
CVE Reference:   CVE-2006-4924   (Links to External Site)
Date:  Oct 12 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:   OpenBSD has issued the following patches:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/020_ssh2.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/015_ssh.patch

Vendor URL:  www.openssh.org/ (Links to External Site)
Cause:   State error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.8, 3.9

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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