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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(OpenBSD Issues Fix) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
SecurityTracker Alert ID:  1035250
SecurityTracker URL:  http://securitytracker.com/id/1035250
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:   OpenBSD has issued a fix:

http://ftp.openbsd.org/pub/OpenBSD/patches/5.7/common/023_sshd.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/5.8/common/011_sshd.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/5.9/common/001_sshd.patch.sig

The OpenBSD advisories are available at:

http://www.openbsd.org/errata57.html
http://www.openbsd.org/errata58.html
http://www.openbsd.org/errata59.html

Vendor URL:  www.openbsd.org/errata59.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  5.7, 5.8, 5.9

Message History:   This archive entry is a follow-up to the message listed below.
Mar 10 2016 OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System



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