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Category:   Application (Security)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH Interaction With OpenPAM Lets Remote Users Deny Service
SecurityTracker Alert ID:  1015706
SecurityTracker URL:  http://securitytracker.com/id/1015706
CVE Reference:   CVE-2006-0883   (Links to External Site)
Date:  Mar 1 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.8.1p1
Description:   A vulnerability was reported in OpenSSH. A remote user can cause denial of service conditions.

When OpenSSH is used with OpenPAM and the OpenSSH-forked child process that handles PAM authentication terminates during PAM authentication, the PAM child process may be left running. If a certain number of these processes are left running, the master OpenSSH server may stop accepting client connections.

This can be triggered by a remote user repeatedly connecting to the target server, waiting for a password prompt, and then closing the connection.

Impact:   A remote user can cause the target OpenSSH server to stop accepting client connections.
Solution:   The vendor issued a fixed version (3.8.1p1) in April 2004, available at:

http://www.openssh.org/portable.html

Vendor URL:  www.openssh.org/ (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.
Mar 1 2006 (FreeBSD Issues Fix) OpenSSH Interaction With OpenPAM Lets Remote Users Deny Service
FreeBSD has released a fix for FreeBSD 5.3 and 5.4.



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