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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
SecurityTracker Alert ID:  1035249
SecurityTracker URL:  http://securitytracker.com/id/1035249
CVE Reference:   CVE-2016-3115   (Links to External Site)
Updated:  Mar 11 2016
Original Entry Date:  Mar 10 2016
Impact:   Disclosure of user information, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 7.2p2
Description:   A vulnerability was reported in OpenSSH. A remote authenticated user can inject xauth commands.

The sshd server does not properly validate user-supplied X11 authentication credentials when establishing an X11 forwarding session before supplying the credentials to xauth. A remote authenticated user can send specially crafted X11 credential data to inject xauth commands. The commands will run with the user's own privileges but can be exploited to, for example, read or overwrite files, connect to local ports, or perform other attacks against xauth.

Systems with X11Forwarding enabled are affected.

github.com/tintinweb reported this vulnerability.

Impact:   A remote authenticated user can inject arbitrary xauth commands to, for example, read or overwrite files, connect to local ports, or perform other attacks against xauth.
Solution:   The vendor has issued a fix (7.2p2).

The vendor's advisory is available at:

http://www.openssh.com/txt/x11fwd.adv

Vendor URL:  www.openssh.com/txt/x11fwd.adv (Links to External Site)
Cause:   Input validation 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 10 2016 (OpenBSD Issues Fix) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
OpenBSD has issued a fix for OpenBSD 5.7, 5.8, and 5.9.
Mar 17 2016 (FreeBSD Issues Fix) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
FreeBSD has issued a fix for FreeBSD 9.3 and 10.2.
Mar 21 2016 (Red Hat Issues Fix) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Mar 21 2016 (Red Hat Issues Fix) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Mar 22 2016 (CentOS Issues Fix) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
CentOS has issued a fix for CentOS 6 and 7.
Mar 22 2016 (Oracle Issues Fix for Oracle Linux) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Oracle has issued a fix for Oracle Linux 7.
Mar 22 2016 (Oracle Issues Fix for Oracle Linux) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Oracle has issued a fix for Oracle Linux 6.
Apr 4 2016 (Oracle Issues Fix for Oracle Linux) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Oracle has issued a fix for Oracle Linux 5.
May 4 2016 (IBM Issues Fix for IBM AIX) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
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 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 15.10.
Jan 18 2017 (Juniper Issues Fix for Juniper NSM) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
Juniper has issued a fix for Juniper NSM3000, NSM4000, and NSMExpress.



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