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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH Race Condition in Signal Handler Lets Remote Users Deny Service and May Potentially Permit Code Execution
SecurityTracker Alert ID:  1016940
SecurityTracker URL:  http://securitytracker.com/id/1016940
CVE Reference:   CVE-2006-5051   (Links to External Site)
Date:  Sep 28 2006
Impact:   Denial of service via network, Execution of arbitrary code via network, User access 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 may be able to execute arbitrary code on the target system.

A remote user can exploit a race condition in an unsafe signal hander to cause denial of service conditions.

On portable OpenSSH, a remote user may theoretically be able to exploit this flaw to execute arbitrary code if GSSAPI authentication is enabled.

The vendor credits Mark Dowd with reporting this vulnerability.

Impact:   A remote user can cause denial of service conditions.

A remote user may be able to execute arbitrary code on the target system.

Solution:   The vendor has issued a fixed version (4.4).

The OpenSSH advisory is available at:

http://www.openssh.org/txt/release-4.4

Vendor URL:  www.openssh.org/txt/release-4.4 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 29 2006 (Red Hat Issues Fix) OpenSSH Race Condition in Signal Handler Lets Remote Users Deny Service and May Potentially Permit Code Execution
Red Hat has released a fix for Red Hat Enterprise Linux 3 and 4.
Sep 29 2006 (Red Hat Issues Fix) OpenSSH Race Condition in Signal Handler Lets Remote Users Deny Service and May Potentially Permit Code Execution
Red Hat has released a fix for Red Hat Enterprise Linux 2.1
Oct 12 2006 (OpenBSD Issues Fix) OpenSSH Race Condition in Signal Handler Lets Remote Users Deny Service and May Potentially Permit Code Execution
OpenBSD has issued a fix.



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