X.Org X Server: Multiple vulnerabilities

X.Org X Server: Multiple vulnerabilities Multiple vulnerabilities in the X.Org X server might allow local attackers to disclose information. xorg-server October 22, 2011 October 22, 2011: 2 387069 local 1.9.5-r1 1.10.4-r1 1.10.4-r1

The X Window System is a graphical windowing system based on a client/server model.

vladz reported the following vulnerabilities in the X.Org X server:

The X.Org X server follows symbolic links when trying to access the lock file for a X display, showing a predictable behavior depending on the file type of the link target (CVE-2011-4028).
The X.Org X server lock file mechanism allows for a race condition to cause the X server to modify the file permissions of an arbitrary file to 0444 (CVE-2011-4029).

A local attacker could exploit these vulnerabilities to disclose information by making arbitrary files on a system world-readable or gain information whether a specified file exists on the system and whether it is a file, directory, or a named pipe.

There is no known workaround at this time.

All X.Org X Server 1.9 users should upgrade to the latest 1.9 version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.9.5-r1"

All X.Org X Server 1.10 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.4-r1"

CVE-2011-4028 CVE-2011-4029 a3li a3li