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Category:   Application (VPN)  >   OpenSSH Vendors:
(Oracle Issues Fix for Oracle Linux) OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions
SecurityTracker Alert ID:  1035348
SecurityTracker URL:
CVE Reference:   CVE-2016-1908   (Links to External Site)
Date:  Mar 22 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:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Jan 19 2016 OpenSSH X11 Forwarding Flaw Lets Users Bypass Trust Restrictions

 Source Message Contents

Subject:  [El-errata] ELSA-2016-0465 Moderate: Oracle Linux 7 openssh security update

Oracle Linux Security Advisory ELSA-2016-0465

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:



Description of changes:

[6.6.1p1-25 + 0.9.3-9]
- CVE-2016-1908: possible fallback from untrusted to trusted X11 
forwarding (#1298741)

[6.6.1p1-24 + 0.9.3-9]
- CVE-2016-3115: missing sanitisation of input for X11 forwarding (#1317818)

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