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Category:   Application (Generic)  >   X Vendors:   X.org
(Ubuntu Issues Fix) X.org libX11 Bugs Let Remote Users Deny Service and Potentially Execute Arbitrary Code
SecurityTracker Alert ID:  1041589
SecurityTracker URL:  http://securitytracker.com/id/1041589
CVE Reference:   CVE-2018-14598, CVE-2018-14599, CVE-2018-14600   (Links to External Site)
Date:  Aug 30 2018
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Several vulnerabilities were reported in X.org libX11. A remote user can cause the target service to crash. A remote user can execute arbitrary code on the target system.

A remote X server can return a specially crafted response to trigger an off-by-one memory write error in the XGetFontPath(), XListExtensions(), and XListFonts() functions to potentially execute arbitrary code on the target X client [CVE-2018-14599].

A remote user can send specially crafted data to trigger an out-of-bounds memory write error and potentially execute arbitrary code on the target system [CVE-2018-14600].

A remote server can return a specially crafted reply to cause the target X client to crash [CVE-2018-14598].

Tobias Stoeckmann reported these vulnerabilities.

Impact:   A remote user can cause the target application to crash.

A remote user can execute arbitrary code on the target system.

Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://usn.ubuntu.com/usn/usn-3758-1

Vendor URL:  usn.ubuntu.com/usn/usn-3758-2 (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 ESM

Message History:   This archive entry is a follow-up to the message listed below.
Aug 21 2018 X.org libX11 Bugs Let Remote Users Deny Service and Potentially Execute Arbitrary Code



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