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		Caldera International, Inc.  Security Advisory

Subject:		OpenServer 5.0.5 OpenServer 5.0.6 : REVISED: crontab format string vulnerability
Advisory number: 	CSSA-2002-SCO.35.1
Issue date: 		2002 July 30
Cross reference:
______________________________________________________________________________


1. Problem Description

	The crontab program contains a format string vulnerability
	that can be used by a malicious user to execute code to
	gain privilege.

	This revision of the fix addresses some installation problems
	with the original fix.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.5		/etc/cron
					/usr/bin/at
					/usr/bin/crontab

	OpenServer 5.0.6		/etc/cron
					/usr/bin/at
					/usr/bin/crontab


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.35.1


	4.2 Verification

	MD5 (VOL.000.000) = ee2e95b0bbde2c5121ba93d4c2735800

	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.35.1


	5.2 Verification

	MD5 (VOL.000.000) = ee2e95b0bbde2c5121ba93d4c2735800

	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:
		Strategic Reconnaissance Team Security Advisory
		(SRT2002-06-04-1611) http://www.snosoft.com

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

	This security fix closes Caldera incidents sr864228, fz520964,
	erg712045.


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

	KF (dotslash@snosoft.com) discovered and researched this
	vulnerability.

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