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[ GLSA 200806-07 ] X.Org X server: Multiple vulnerabilities
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GLSA
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PostPosted: Thu Jun 19, 2008 6:26 pm    Post subject: [ GLSA 200806-07 ] X.Org X server: Multiple vulnerabilities Reply with quote

Gentoo Linux Security Advisory

Title: X.Org X server: Multiple vulnerabilities (GLSA 200806-07)
Severity: high
Exploitable: remote, local
Date: June 19, 2008
Bug(s): #225419
ID: 200806-07

Synopsis


Multiple vulnerabilities have been discovered in the X.Org X server,
possibly allowing for the remote execution of arbitrary code with root
privileges.


Background


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


Affected Packages

Package: x11-base/xorg-server
Vulnerable: < 1.3.0.0-r6
Unaffected: >= 1.3.0.0-r6
Architectures: All supported architectures


Description


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).


Impact


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.


Workaround


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:
Code:

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


Resolution


All X.org X Server users should upgrade to the latest version:
Code:
# emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r6"


References

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


Last edited by GLSA on Sun Jul 25, 2010 4:26 am; edited 2 times in total
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