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      SCO Security Advisory

Subject:    OpenServer 6.0.0 : X.Org X Server Arbitrary Code Execution Vulnerability
Advisory number:   SCOSA-2006.14
Issue date:     2006 March 16
Cross reference:  fz532984
      CVE-2005-2495 
      VU#102441 
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1. Problem Description

  Multiple X Window System server applications share code
  that may contain a flaw in the memory allocation for large
  pixmaps. The affected products include the X.Org X server 
  applications.
  
  An integer overflow condition may result in a memory allocation
  request returning an allocated region that is incorrectly
  sized. The client may then be able to use the XDrawPoint()
  and XGetImage() functions to read and write to arbitrary
  locations in the X server's address space.
  
  A malicious local authenticated attacker may be able to
  execute arbitrary code with the privileges of the X server.
  
  The Common Vulnerabilities and Exposures project
  (cve.mitre.org) has assigned the name CVE-2005-2495 to
  this issue.


2. Vulnerable Supported Versions

  System        Binaries
  ----------------------------------------------------------------------
  OpenServer 6.0.0     XORGServer package


3. Solution

  The proper solution is to install the latest packages.


4. OpenServer 6.0.0

  4.1 Location of Fixed Binaries

  ftp://ftp.sco.com/pub/openserver6/600/mp/osr600mp2/osr600mp2.iso


  4.2 Verification

  MD5 (osr600mp2.iso) = 7e560dcde374eb60df2b4a599ac20d8a

  md5 is available for download from
    ftp://ftp.sco.com/pub/security/tools


  4.3 Installing Fixed Binaries

  See the SCO OpenServer Release 6.0.0 Maintenance Pack 2 Release
  and Installation Notes:

  ftp://ftp.sco.com/pub/openserver6/600/mp/osr600mp2/osr600mp2.html


5. References

  Specific references for this advisory:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2495
    http://www.kb.cert.org/vuls/id/102441 
    https://bugs.freedesktop.org/show_bug.cgi?id=594 
    http://secunia.com/advisories/16790/ 
    http://secunia.com/advisories/16777/

  SCO security resources:
    http://www.sco.com/support/security/index.html

  SCO security advisories via email
    http://www.sco.com/support/forums/security.html

  This security fix closes SCO incidents fz532984.


6. Disclaimer

  SCO is not responsible for the misuse of any of the information
  we provide on this website and/or through our security
  advisories. Our advisories are a service to our customers intended
  to promote secure installation and use of SCO products.


7. Acknowledgments

  Thanks to Luke Hutchison and Søren Sandmann Pedersen for reporting
  this vulnerability.

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