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Category:   Application (Generic)  >   X Vendors:   X.org
(Ubuntu Issues Fix) X Client Library Bugs Let Remote and Local Users Deny Service or Gain Elevated Privileges
SecurityTracker Alert ID:  1041588
SecurityTracker URL:  http://securitytracker.com/id/1041588
CVE Reference:   CVE-2016-7942, CVE-2016-7943   (Links to External Site)
Date:  Aug 30 2018
Impact:   Denial of service via local system, Denial of service via network, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Multiple vulnerabilities were reported in X client libraries. A remote or local user can cause denial of service conditions on the target system. A remote or local user can gain elevated privileges.

Several X client libraries do not properly validate data received from the X server. A remote or local X server can supply specially crafted data to trigger an out-of-bounds memory read or write error, integer overflow, buffer underflow, endless loop, or other error.

An out-of-bounds memory read or write error may occur in libX11 [CVE-2016-7942, CVE-2016-7943].

An integer overflow may occur in libXfixes on 32-bit systems [CVE-2016-7944].

An out-of-bounds memory access error or endless loop may occur in libXi [CVE-2016-7945, CVE-2016-7946].

A integer overflow may occur in libXrandr [CVE-2016-7947]. Other errors may occur [CVE-2016-7948].

An out-of-bounds memory write error may occur in libXrender [CVE-2016-7949, CVE-2016-7950].

An integer overflow may occur in XRecord [CVE-2016-7951]. Other errors may occur in XRecord [CVE-2016-7952].

A memory corruption error may occur in libXv [CVE-2016-5407].

A buffer read underflow may occur in libXvMC [CVE-2016-7953].

The impact depends on the applications that use the affected libraries.

Tobias Stoeckmann from the OpenBSD project reported these vulnerabilities.

Impact:   A remote or local user can cause denial of service conditions.

A remote or local user can gain elevated privileges on the target system.

The impact depends on the applications that use the affected libraries.

Solution:   Ubuntu has issued a fix for CVE-2016-7942 and CVE-2016-7943.

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, Input validation 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.
Oct 5 2016 X Client Library Bugs Let Remote and Local Users Deny Service or Gain Elevated Privileges



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