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

______________________________________________________________________________

       SCO Security Advisory

Subject:    OpenServer 5.0.6 OpenServer 5.0.7 : TCP Remote ICMP Denial Of Service Vulnerabilities
Advisory number:  SCOSA-2006.4
Issue date:    2006 January 04
Cross reference:  sr892503 fz530662 erg712759
       CVE-2004-0790 CVE-2004-0791 CVE-2004-1060
______________________________________________________________________________


1. Problem Description

   The Internet Control Message Protocol is used to alert hosts on
   a network about certain situations, and the hosts then take
   automatic action to prevent network failures or to improve
   transport efficiency. The RFC recommends no security checking
   for in-bound ICMP messages, so long as a related connection
   exists, and may potentially allow several different Denials of
   Service. The following individual attacks are reported:

   A blind connection-reset attack is reported, which takes
   advantage of the specification that describes that on receiving
   a 'hard' ICMP error, the corresponding connection should be
   aborted. A remote attacker may terminate target TCP connections
   and deny service for legitimate users.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)
   has assigned the name CVE-2004-0790 to this issue.

   An ICMP Source Quench attack is reported, which exploits the
   specification that a host must react to ICMP Source Quench
   messages by slowing transmission on the associated connection. A
   remote attacker may effectively degrade performance for a
   legitimate connection.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)
   has assigned the name CVE-2004-0791 to this issue.

   A suitable forged ICMP PMTUD message may be used to reduce the
   MTU for a given connection in a similar manner.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)
   has assigned the name CVE-2004-1060 to this issue.


2. Vulnerable Supported Versions

   System        Binaries
   ----------------------------------------------------------------------
   OpenServer 5.0.6     ip and tcp drivers
   OpenServer 5.0.7     ip and tcp drivers


3. Solution

   The proper solution is to install the latest packages.


4. OpenServer 5.0.6

   4.1 Location of Fixed Binaries

   ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4


   4.2 Verification

   MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd

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


   4.3 Installing Fixed Binaries

   The following packages should be installed on your system before
   you install this fix:

     RS506A
     OSS646
     ERG711746: ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3/SCOSA-2005.3.txt
     ERG712606: ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.9/SCOSA-2005.9.txt

   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. OpenServer 5.0.7

   5.1 Location of Fixed Binaries

   ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4


   5.2 Verification

   MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd

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


   5.3 Installing Fixed Binaries

   The following package should be installed on your system before
   you install this fix:

     OSR507MP4 - OpenServer 5, Release 5.0.7 Maintenance Pack 4

   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.


6. References

   Specific references for this advisory:
     http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0790
     http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0791
     http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1060

   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 sr892503 fz530662
   erg712759.


7. 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.


8. Acknowledgments

   The SCO Group would like to thank Fernando Gont for reporting
   these issues.

______________________________________________________________________________
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (UnixWare)

iD8DBQFDvABwaqoBO7ipriERAiOAAJ9CiZ8KDSJq61MlGeAHvZJOod8PzQCcDwq0
FGjQW8oNTpcQAiDgd40s/NI=
=ecCh
-----END PGP SIGNATURE-----