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______________________________________________________________________________
		   Caldera Systems, Inc.  Security Advisory

Subject: 		DoS attack on sendmail
Advisory number: 	CSSA-1999:002.0
Issue date: 		1999 Jan 29
Cross reference: 	
______________________________________________________________________________


1. Problem Description

   Sendmail servers that pause for five second after accept() returns an error
   can be stopped if a peer resets the connection.


2. Vulnerable Versions

   Systems: 	OpenLinux 1.0, 1.1, 1.2, 1.3.
   Packages: 	<= sendmail-8.8.7-4.i386.rpm


3. Solutions

   The proper solution is to upgrade to the senmail-8.8.7-6 packages. 


4. Location of Fixed Packages

   The upgrade packages can be found on Caldera's FTP site at:

   ftp://ftp.caldera.com/pub/OpenLinux/updates/1.3/019/RPMS/

   The corresponding source code package can be found at:

   ftp://ftp.caldera.com/pub/OpenLinux/updates/1.3/019/SRPMS


5. Installing Fixed Packages

   Upgrade the affected packages with the following commands:

   rpm -q sendmail-doc && rpm -U sendmail-doc-8.8.7-6.i386.rpm
   rpm -q sendmail-cf && rpm -U sendmail-cf-8.8.7-6.i386.rpm
   rpm -q sendmail && rpm -U sendmail-8.8.7-6.i386.rpm


6. Verification

   The MD5 checksums (from the "md5sum" command) for these packages are:

   87d4fa72995de73e866c37eba998a378  RPMS/sendmail-8.8.7-6.i386.rpm
   45b0ad87a639d20cee0c637ebaa2ee88  RPMS/sendmail-doc-8.8.7-6.i386.rpm
   ea2242e8dc1a5c8f0c0f219ce269a356  SRPMS/sendmail-8.8.7-6.src.rpm

7. References

   This and other Caldera security resources are located at:

   http://www.calderasystems.com/news/security/index.html
  
   Additional documentation on this problem can be found in:
  

   This security fix closes Caldera's internal Problem Report 4187.


8. Disclaimer

   Caldera Systems, Inc. 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 Caldera OpenLinux.

______________________________________________________________________________


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