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		Caldera International, Inc.  Security Advisory

Subject:		OpenServer 5.0.5 OpenServer 5.0.6 : timed does not enforce nulls
Advisory number: 	CSSA-2002-SCO.33
Issue date: 		2002 July 15
Cross reference:
______________________________________________________________________________


1. Problem Description

	The timed program does not enforce null-termination of
	strings in certain situations. It is possible that this
	could be used by a malicious user to perform a remote
	denial-of-service attack.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.5		/etc/timed
	OpenServer 5.0.6		/etc/timed


3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.5

	4.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.33


	4.2 Verification

	MD5 (VOL.000.000) = 8f818406b55b806e10b05c3647517265

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


	4.3 Installing Fixed Binaries

		Upgrade the affected binaries with the following commands:

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

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


5. OpenServer 5.0.6

	5.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.33


	5.2 Verification

	MD5 (VOL.000.000) = 8f818406b55b806e10b05c3647517265

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


	5.3 Installing Fixed Binaries

		Upgrade the affected binaries with the following commands:

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

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


6. References

	Specific references for this advisory:
		http://xforce.iss.net/static/6228.php
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0388

	Caldera security resources:
		http://www.caldera.com/support/security/index.html

	This security fix closes Caldera incidents sr855195,
	SCO-559-1321, erg711889.


7. Disclaimer

	Caldera International, 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 products.


8. Acknowledgements

	This vulnerability was discovered and researched by David
	A. Holland <dholland@www.linux.org.uk>.

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