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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
SecurityTracker Alert ID:  1034705
SecurityTracker URL:  http://securitytracker.com/id/1034705
CVE Reference:   CVE-2016-1908   (Links to External Site)
Date:  Jan 19 2016
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7.1p2
Description:   A vulnerability was reported in OpenSSH. A remote authenticated user can bypass security restrictions in certain cases.

A remote authenticated X application can trigger a flaw in the handling of errors when generating authentication cookies for untrusted X11 forwarding to establish a trusted connection to the target local X server when only untrusted X11 forwarding was requested. As a result, the remote X client may gain privileged access to the target local X server.

Thomas Hoger reported this vulnerability.

Impact:   A remote authenticated X client can cause X11 forwarding trust to fallback from untrusted to trusted to gain privileged access to the target local X server.
Solution:   The vendor has issued a source code fix, available at:

https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c

https://anongit.mindrot.org/openssh.git/commit/?id=f98a09cacff7baad8748c9aa217afd155a4d493f

https://anongit.mindrot.org/openssh.git/commit/?id=2fecfd486bdba9f51b3a789277bb0733ca36e1c0

Vendor URL:  www.openssh.com/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Mar 21 2016 (Red Hat Issues Fix) OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Mar 22 2016 (Oracle Issues Fix for Oracle Linux) OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
Oracle has issued a fix for Oracle Linux 7.
May 4 2016 (IBM Issues Fix for IBM AIX) OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
IBM has issued a fix for IBM AIX 5.3, 6.1, 7.1, and 7.2.
May 9 2016 (Ubuntu Issues Fix) OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 15.10.
May 10 2016 (Red Hat Issues Fix) OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
Red Hat has issued a fix for Red Hat Enterprise Linux 6.



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