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______________________________________________________________________________

      SCO Security Advisory

Subject:    UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 : telnet client multiple issues
Advisory number:   SCOSA-2005.21
Issue date:     2005 April 08
Cross reference:  sr893210 fz531446 erg712801 CAN-2005-0469 CAN-2005-0468
______________________________________________________________________________


1. Problem Description

  Buffer overflow in the slc_add_reply function in various
  BSD-based Telnet clients, when handling LINEMODE suboptions,
  allows remote attackers to execute arbitrary code via a
  reply with a large number of Set Local Character (SLC)
  commands. 

  The Common Vulnerabilities and Exposures project (cve.mitre.org) 
  has assigned the name CAN-2005-0469 to this issue. 

  Heap-based buffer overflow in the env_opt_add function
  in telnet.c for various BSD-based Telnet clients allows
  remote attackers to execute arbitrary code via responses
  that contain a large number of characters that require
  escaping, which consumers more memory than allocated. 
  
  The Common Vulnerabilities and Exposures project (cve.mitre.org)
  has assigned the name CAN-2005-0468 to this issue.


2. Vulnerable Supported Versions

  System        Binaries
  ----------------------------------------------------------------------
  UnixWare 7.1.4       /usr/bin/telnet
  UnixWare 7.1.3       /usr/bin/telnet
  UnixWare 7.1.1       /usr/bin/telnet


3. Solution

  The proper solution is to install the latest packages.


4. UnixWare 7.1.4

  4.1 Location of Fixed Binaries

  ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.21

  4.2 Verification

  MD5 (erg712801.714.pkg.Z) = bf53673ea12a1c25e3606a5b879adbc4

  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:

  Download erg712801.714.pkg.Z to the /var/spool/pkg directory

  # uncompress /var/spool/pkg/erg712801.714.pkg.Z
  # pkgadd -d /var/spool/pkg/erg712801.714.pkg


5. UnixWare 7.1.3

  5.1 Location of Fixed Binaries

  ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.21

  5.2 Verification

  MD5 (erg712801.713.pkg.Z) = e876b261afbecb41c18c26d6ec11e71d

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

  5.3 Installing Fixed Binaries

  Upgrade the affected binaries with the following sequence:

  Download erg712801.713.pkg.Z to the /var/spool/pkg directory

  # uncompress /var/spool/pkg/erg712801.713.pkg.Z
  # pkgadd -d /var/spool/pkg/erg712801.713.pkg


6. UnixWare 7.1.1

  6.1 Location of Fixed Binaries

  ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.21

  6.2 Verification

  MD5 (erg712801.711.pkg.Z) = f3099416a793c1f731bc7e377fe0e4a2

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

  6.3 Installing Fixed Binaries

  Upgrade the affected binaries with the following sequence:

  Download erg712801.711.pkg.Z to the /var/spool/pkg directory

  # uncompress /var/spool/pkg/erg712801.711.pkg.Z
  # pkgadd -d /var/spool/pkg/erg712801.711.pkg


7. References

  Specific references for this advisory:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468 
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469 
    http://www.idefense.com/application/poi/display?id=221&type=vulnerabilities 
    http://www.idefense.com/application/poi/display?id=220&type=vulnerabilities

  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 sr893210 fz531446
  erg712801.


8. 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.


9. Acknowledgments

  SCO would like to thank Gal Delalleau and iDEFENSE

______________________________________________________________________________

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