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Category:   Application (Security)  >   Juniper NSM Vendors:   Juniper
(Juniper Issues Fix for Juniper NSM) OpenSSH X11 Authentication Credentials Input Validation Flaw Lets Remote Authenticated Users Inject xauth Commands on the Target System
SecurityTracker Alert ID:  1037618
SecurityTracker URL:  http://securitytracker.com/id/1037618
CVE Reference:   CVE-2016-3115   (Links to External Site)
Date:  Jan 18 2017
Impact:   Disclosure of user information, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): NSM3000, NSM4000, NSMExpress
Description:   A vulnerability was reported in OpenSSH. A remote authenticated user can inject xauth commands. Juniper NSM is affected.

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 (NSM Appliance Upgrade Package v3).

The Juniper advisory is available at:

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10774

Vendor URL:  kb.juniper.net/InfoCenter/index?page=content&id=JSA10774 (Links to External Site)
Cause:   Input validation error

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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