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______________________________________________________________________________

      SCO Security Advisory

Subject:    OpenServer 5.0.7 OpenServer 5.0.6 OpenServer 5.0.5 : Multiple security vulnerabilities in Xsco
Advisory number:   CSSA-2003-SCO.26
Issue date:     2003 October 10
Cross reference:   sr862609 fz520528 erg712006 sr860995 fz520242 erg711972 CAN-2002-0158 CAN-2002-0164 
______________________________________________________________________________


1. Problem Description

  This supplement corrects two unrelated security problems in the
        SCO OpenServer "Xsco" X11 server.

        First,

  NSFOCUS Security Team has found a buffer overflow vulnerability
  in Xsun shipped with Solaris system when processing a
  command line parameter "-co", which could enable a local
  attacker to run arbitrary code with root user/root group
  privilege. 
   
  Kevin Finisterre of Snosoft.com discovered that Xsco was also
  vulnerable. 
   
  The Common Vulnerabilities and Exposures (CVE) project has assigned 
  the name CAN-2002-0158 to this issue. This is a candidate for 
  inclusion in the CVE list (http://cve.mitre.org), which standardizes 
  names for security problems. Candidates may change significantly
  before they become official CVE entries.

  Second,

  Roberto Zunino discovered a vulnerability in the MIT-SHM extension in
  all X servers that are running as root.

  Any user with local X access can exploit the MIT-SHM extension and gain
  read/write access to any shared memory segment on the system. 

  The Common Vulnerabilities and Exposures (CVE) project has assigned
        the name CAN-2002-0164 to this issue. This is a candidate for
        inclusion in the CVE list (http://cve.mitre.org), which standardizes
        names for security problems. Candidates may change significantly
        before they become official CVE entries.


2. Vulnerable Supported Versions

  System        Binaries
  ----------------------------------------------------------------------
  OpenServer 5.0.7     /usr/bin/X11/Xsco
  OpenServer 5.0.6     /usr/bin/X11/Xsco
  OpenServer 5.0.5     /usr/bin/X11/Xsco


3. Solution

  The proper solution is to install the latest packages.


4. OpenServer 5.0.7, OpenServer 5.0.6, OpenServer 5.0.5

  4.1 Location of Fixed Binaries

  ftp://ftp.sco.com/pub/updates/OpenServer/CSSA-2003-SCO.26


  4.2 Verification

  MD5 (VOL.000.000) = e7cbf7a8094ba43d44a6657a95673aeb
  MD5 (VOL.001.000) = 2eca28ac86436cec5fa7f059ab2fe850

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


  4.3 Installing Fixed Binaries

  Upgrade the affected binaries with the following sequence:

  1) Download the VOL* files to the /tmp directory

  2) Run the custom command, specify an install from media
  images, and specify the /tmp directory as the location of
  the images.


5. References

  Specific references for this advisory:
    http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0158 
    http://marc.theaimsgroup.com/?l=bugtraq&m=101776858410652&w=2 
    http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0000.html
    http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0164
    http://marc.theaimsgroup.com/?l=bugtraq&m=103547625009363&w=2
    http://xforce.iss.net/xforce/xfdb/8706
    http://www.securityfocus.com/bid/4396
    http://www.linuxsecurity.com/advisories/caldera_advisory-2006.html
    ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14/CSSA-2002-SCO.14.txt
  SCO security resources:

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

  This security fix closes SCO incidents sr862609 fz520528
  erg712006 sr860995 fz520242 erg711972


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

  SCO would like to thank the NSFOCUS Security Team for finding
        the "-co" vulnerability, and Kevin Finisterre of Snosoft.com for
        confirming its applicability to Xsco.  SCO would also like to
        thank Roberto Zunino for discovering the MIT-SHM vulnerability.

______________________________________________________________________________

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