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Category:   Application (Generic)  >   libXfont Vendors:   X.org
(Ubuntu Issues Fix) libXfont Font Processing Flaws Lets Local Users Deny Service or Gain Elevated Privileges
SecurityTracker Alert ID:  1031938
SecurityTracker URL:  http://securitytracker.com/id/1031938
CVE Reference:   CVE-2015-1802, CVE-2015-1803, CVE-2015-1804   (Links to External Site)
Date:  Mar 18 2015
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Several vulnerabilities were reported in libXfont. A local user can obtain elevated privileges on the target system.

A local user with access to the X server can cause the X server to read an arbitrary font file to trigger a memory corruption error and cause denial of service conditions or execute arbitrary code on the target system with the privileges of the X server (which may be root privileges on some systems).

An overflow may occur in bdfReadProperties() in the property count [CVE-2015-1802].

An invalid pointer error may cause a crash in bdfReadCharacters() [CVE-2015-1803].

An overflow may occur in bdfReadCharacters() [CVE-2015-1804].

Ilja van Sprundel of IOActive, Alan Coopersmith of Oracle, and William Robinet of Conostix reported these vulnerabilities.

Impact:   A local user can obtain elevated privileges on the target system.

A local user can cause the X server to crash.

Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-2536-1

Vendor URL:  www.x.org/ (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  10.04 LTS, 12.04 LTS, 14.04 LTS, 14.10

Message History:   This archive entry is a follow-up to the message listed below.
Mar 17 2015 libXfont Font Processing Flaws Lets Local Users Deny Service or Gain Elevated Privileges



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