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		Caldera International, Inc.  Security Advisory

Subject:		OpenServer 5.0.5 OpenServer 5.0.6 : yppasswdd remotely exploitable buffer overflow
Advisory number: 	CSSA-2002-SCO.19
Issue date: 		2002 May 20
Cross reference:
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1. Problem Description

	A buffer overflow vulnerability has been discovered in
	/etc/yppasswdd which may be exploited by a local or a remote
	attacker to gain root access on the NIS master server system.


2. Vulnerable Supported Versions

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


3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.5

	4.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.19


	4.2 Verification

	MD5 (VOL.000.000) = d683b9007da3efc51a9f6f9db7270ec2

	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:

	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://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.19


	5.2 Verification

	MD5 (VOL.000.000) = d683b9007da3efc51a9f6f9db7270ec2

	md5 is available for download from
		ftp://stage.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://www.kb.cert.org/vuls/id/327281

	Caldera UNIX security resources:
		http://stage.caldera.com/support/security/

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

	This security fix closes Caldera incidents sr854485,
	SCO-559-1316, and erg711875 .


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.

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