X.Org X server: Multiple vulnerabilities

X.Org X server: Multiple vulnerabilities Multiple vulnerabilities have been discovered in the X.Org X server, possibly allowing for the remote execution of arbitrary code with root privileges. xorg-server June 19, 2008 June 19, 2008: 01 225419 remote, local 1.3.0.0-r6 1.3.0.0-r6

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

Regenrecht reported multiple vulnerabilities in various X server extensions via iDefense:

The SProcSecurityGenerateAuthorization() and SProcRecordCreateContext() functions of the RECORD and Security extensions are lacking proper parameter validation (CVE-2008-1377).
An integer overflow is possible in the function ShmPutImage() of the MIT-SHM extension (CVE-2008-1379).
The RENDER extension contains several possible integer overflows in the AllocateGlyph() function (CVE-2008-2360) which could possibly lead to a heap-based buffer overflow. Further possible integer overflows have been found in the ProcRenderCreateCursor() function (CVE-2008-2361) as well as in the SProcRenderCreateLinearGradient(), SProcRenderCreateRadialGradient() and SProcRenderCreateConicalGradient() functions (CVE-2008-2362).

Exploitation of these vulnerabilities could possibly lead to the remote execution of arbitrary code with root privileges, if the server is running as root, which is the default. It is also possible to crash the server by making use of these vulnerabilities.

It is possible to avoid these vulnerabilities by disabling the affected server extensions. Therefore edit the configuration file (/etc/X11/xorg.conf) to contain the following in the appropriate places:


      Section "Extensions"   
    	Option "MIT-SHM" "disable"
    	Option "RENDER" "disable" 
    	Option "SECURITY" "disable"
      EndSection
    
      Section "Module"
       Disable "record"
      EndSection

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


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r6"

CVE-2008-1377 CVE-2008-1379 CVE-2008-2360 CVE-2008-2361 CVE-2008-2362 vorlon vorlon