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Category:   Application (Generic)  >   X Vendors:   X.org
X Multiple Flaws Let Local Users Conduct Timing and Key Guessing Attacks Obtain Elevated Privileges
SecurityTracker Alert ID:  1037919
SecurityTracker URL:  http://securitytracker.com/id/1037919
CVE Reference:   CVE-2017-2624, CVE-2017-2625, CVE-2017-2626   (Links to External Site)
Date:  Feb 28 2017
Impact:   Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.19.0 and prior
Description:   Several vulnerabilities were reported in X. A local user can gain elevated privileges on the target system.

A local user can conduct a timing attack against potential MIT cookie values to determine a valid cookie and run arbitrary code in the Xorg session of a target user [CVE-2017-2624].

On non-BSD based systems, the libxdm library uses weak entropy to generate session keys [CVE-2017-2625]. A local user may be able to determine key values and attach to the Xorg session of a target user.

The libICE library uses weak entropy to generate session cookies [CVE-2017-2626]. A local user may be able to determine key values and attach to the Xorg session of a target user.

A demonstration exploit for CVE-2017-2626 is available at:

https://www.x41-dsec.de/lab/sources/icetest.c

The original advisory is available at:

https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/

Eric Sesterhenn, X41 D-Sec GmbH, reported these vulnerabilities.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   A proposed patch is available for CVE-2017-2624.
Vendor URL:  x.org/ (Links to External Site)
Cause:   Randomization error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


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