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Category:   Application (Generic)  >   X Vendors:   X.org
X.Org Command Line Validation Flaw Lets Remote Authenticated Users Gain Elevated Privileges and Delete Arbitrary Files
SecurityTracker Alert ID:  1041948
SecurityTracker URL:  http://securitytracker.com/id/1041948
CVE Reference:   CVE-2018-14665   (Links to External Site)
Date:  Oct 25 2018
Impact:   Denial of service via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.19 and later
Description:   A vulnerability was reported in X.Org. A remote authenticated user can gain elevated privileges and delete arbitrary files.

A remote authenticated user can exploit a command line validation flaw to specify a '-modulepath' argument with an insecure path to cause arbitrary code to be executed on the target system.

A remote authenticated user can also exploit a command line validation flaw in the '-logfile' argument to cause arbitrary files to be deleted on the target system.

These can be exploited on systems that have the X.org X server running with elevated privileges and started by a non-root users.

Narendra Shinde reported this vulnerability.

Impact:   A remote authenticated user can gain elevated privileges and delete arbitrary files on the target system.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

https://gitlab.freedesktop.org/xorg/xserver/commit/50c0cf885a6e91c0ea71fb49fa8f1b7c86fe330e

Vendor URL:  gitlab.freedesktop.org/xorg/xserver/commit/50c0cf885a6e91c0ea71fb49fa8f1b7c86fe330e (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 26 2018 (Ubuntu Issues Fix) X.Org Command Line Validation Flaw Lets Remote Authenticated Users Gain Elevated Privileges and Delete Arbitrary Files
Ubuntu has issued a fix for Ubuntu Linux 16.04 LTS, 18.04 LTS, and 18.10.
Nov 9 2018 (Oracle Issues Fix for Oracle Linux) X.Org Command Line Validation Flaw Lets Remote Authenticated Users Gain Elevated Privileges and Delete Arbitrary Files
Oracle has issued a fix for Oracle Linux 7.



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