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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(OpenBSD Issues Fix) OpenSSH Race Condition in Signal Handler Lets Remote Users Deny Service and May Potentially Permit Code Execution
SecurityTracker Alert ID:  1017053
SecurityTracker URL:  http://securitytracker.com/id/1017053
CVE Reference:   CVE-2006-5051   (Links to External Site)
Date:  Oct 12 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:   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/txt/release-4.4 (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 28 2006 OpenSSH Race Condition in Signal Handler Lets Remote Users Deny Service and May Potentially Permit Code Execution



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