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	    Caldera International, Inc. Security Advisory

Subject:		OpenServer: vi /tmp vulnerability
Advisory number: 	CSSA-2001-SCO.17
Issue date: 		2001 September 19
Cross reference:
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1. Problem Description
	
	The vi editor uses temporary names that are predictable. A
	user could use this vulnerability to write arbitrary files.


2. Vulnerable Versions

	Operating System	Version		Affected Files
	------------------------------------------------------------------
	OpenServer		<= 5.0.6a	/usr/bin/{ex,vi,edit,vedit,view} 
						/usr/lib/expreserve
						/usr/lib/exrecover

3. Workaround

	None.


4. OpenServer

  4.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/openserver/CSSA-2001-SCO.17/


  4.2 Verification

	md5 checksums:

	e82e73b8fa21426c19d82fb9cd2988e1	usr.bin.vi.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:

	# cp /usr/bin/ex /usr/bin/ex-
	# cp /usr/lib/expreserve /usr/lib/expreserve-
	# cp /usr/lib/exrecover /usr/lib/exrecover-
	# uncompress /tmp/usr.bin.vi.tar.Z
	# cd /
	# tar xvf /tmp/usr.bin.vi.tar


5. References

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

	This advisory addresses Caldera Security internal incident
	sr847935.

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

	Caldera International wishes to thank KF <dotslash@snosoft.com>
        for discovering and reporting this problem.

	 
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