Security Update: [CSSA-2001-SCO.24] OpenServer: shell here-documents allow various security breaches

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Date: Tue Oct 09 2001 - 10:55:26 PDT

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___________________________________________________________________________

	    Caldera International, Inc. Security Advisory

Subject:		OpenServer: shell here-documents allow various security breaches
Advisory number: 	CSSA-2001-SCO.24
Issue date: 		2001 October 9
Cross reference:
___________________________________________________________________________


1. Problem Description
	
	Shell here-document processing is vulnerable to a variety of
	security attacks.


2. Vulnerable Versions

	Operating System	Version		Affected Files
	------------------------------------------------------------------
	OpenServer		<= 5.0.6a	/bin/sh
						/sbin/sh
						/bin/csh
						/bin/ksh
						/usr/bin/euc/ksh
						/usr/lib/scosh/utilbin/oash


3. Workaround

	None.


4. OpenServer

  4.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/openserver/CSSA-2001-SCO.24/


  4.2 Verification

	md5 checksums:
	
	76a2c883b71361ebb1180169e849734b	shells.tar.Z

	md5 is available for download from

		ftp://stage.caldera.com/pub/security/tools/


  4.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following commands:

	# uncompress /tmp/shells.tar.Z
	# for i in /bin/csh /bin/ksh /bin/sh /sbin/sh /usr/bin/euc/ksh /usr/lib/scosh/utilbin/oash
	> do
	> mv $i ${i}-
	> done
	# cd /
	# tar xvf /tmp/shells.tar

5. References

	http://www.kb.cert.org/vuls/id/10277

	This and other advisories are located at
		http://stage.caldera.com/support/security

	This advisory addresses Caldera Security internal incident
	sr847825.

6. Disclaimer

	Caldera International, Inc. is not responsible for the misuse
	of any of the information we provide on our website and/or
	through our security advisories. Our advisories are a service
	to our customers intended to promote secure installation and
	use of Caldera International products.


7. Acknowledgements

	The original discoverer of this vulnerability was Gordon Irlam
	of the Univeristy of Adelaide, Australia.

	 
___________________________________________________________________________

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