-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

______________________________________________________________________________

      SCO Security Advisory

Subject:    OpenServer 5.0.7 : authsh and backupsh buffer overflow
Advisory number:   SCOSA-2005.40
Issue date:     2005 October 20
Cross reference:  sr894990 fz532992 erg712939 sr894993 fz532995 erg712941 CAN-2005-2926
______________________________________________________________________________


1. Problem Description

  iDEFENSE has identified a Buffer Overflow vulnerability in
  SCO Openserver backupsh. The backupsh utility is a standard
  binary distributed with Openserver 5.0.7 and earlier. 

  Local attackers could supply a specially crafted string to 
  overflow a stack buffer and execute arbitrary code with group 
  backup privileges. Successful exploitation of this vulnerability
  will result in execution of arbitrary code with permissions
  of the running process. The binary is setgid backup by
  default and can be used by attackers with a local account
  to gain backup privileges. 

  The Common Vulnerabilities and Exposures project (cve.mitre.org) 
  has assigned the name CAN-2005-2926 to this issue.


2. Vulnerable Supported Versions

  System        Binaries
  ----------------------------------------------------------------------
  OpenServer 5.0.7     /usr/lib/sysadm/authsh
          /usr/lib/sysadm/backupsh

3. Solution

  The proper solution is to install the latest packages.

4. OpenServer 5.0.7

  4.1 Location of Fixed Binaries

  ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.40

  4.2 Verification

  MD5 (VOL.000.000) = ebcf85edb0e7c8c0a3af4cec65a27ed7

  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 a directory

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


5. References

  Specific references for this advisory:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2926

  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 sr894990 fz532992
  erg712939 sr894993 fz532995 erg712941.


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 iDefense for discovering and reporting
  this weakness.

______________________________________________________________________________

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (SCO_SV)
Comment: For info see http://www.gnupg.org

iEYEARECAAYFAkNX5bQACgkQaqoBO7ipriHu4wCgo+xDebe8Xjzx8xa46L1wgRCf
UTsAoJQjHfZNCfgLUXhnZK1N7PkDEpGG
=j+3D
-----END PGP SIGNATURE-----