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			SCO Security Advisory

Subject:		OpenServer 5.0.6 OpenServer 5.0.7 : bind remote attacker can poison the nameserver cache
Advisory number: 	SCOSA-2005.4
Issue date: 		2005 January 20
Cross reference:	sr886767 fz528463 erg712478 CAN-2003-0914
______________________________________________________________________________


1. Problem Description

	ISC BIND 8.3.x before 8.3.7, and 8.4.x before 8.4.3, allows
	remote attackers to poison the cache via a malicious name
	server that returns negative responses with a large TTL
	(time-to-live) value. 

	CERT/CC Incident Note VU#734644 

	The Common Vulnerabilities and Exposures project (cve.mitre.org)
	has assigned the name CAN-2003-0914 to this issue.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.7		See the Maintenance Pack 3 Release Notes
					
	OpenServer 5.0.6 		/etc/named
					/etc/named-xfer
					/usr/bin/nslookup
					/etc/dig
					/etc/host
					/etc/nsupdate
					/etc/dnsquery
					/etc/addr
3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.6

	4.1 First install oss646c or later

        4.2 Location of oss646c

        ftp://ftp.sco.com/pub/openserver5/oss646c/

        4.3 Verification of oss646c

        MD5 (VOL.000.000) = f19b6c6949f615316bfb075d249989e8
        MD5 (VOL.000.001) = 341ff8553aecd2c7b0c2beaf83030d0f
        MD5 (VOL.000.002) = 6e46708ad8029e12280d4f9ac60ab814
        MD5 (VOL.000.003) = 2868b64a6a6db742adb3b485be645d7e
        MD5 (VOL.000.004) = 1696fe1db9bb063827ee5e76e58dff84
        MD5 (VOL.000.005) = f39da342f8af72fcaccdf478dca04109
        MD5 (VOL.000.006) = 2b31611c8af7d2e7910d6e8e3cf701a6
        MD5 (VOL.000.007) = d0175c0f4e3ed29435b1eab95609f8f4
        MD5 (VOL.000.008) = aa9e8a525c341fed077f981b1dacb486
        MD5 (VOL.000.009) = 8e023af67b57507824406bdda322079a
        MD5 (VOL.000.010) = 2b46e8adba8ae0b64109f2069da978a2

        4.4 Installation of oss646c

        See ftp://ftp.sco.com/pub/openserver5/oss646c/oss646c.txt

	4.5 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.4

	4.6 Verification

	MD5 (VOL.000.000) = f9487c1767b6454d7171b92f87d88bef

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


	4.7 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	1) Download the VOL* files to a directory

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


5. OpenServer 5.0.7

	5.1 Location of Fixed Binaries

	Maintenance Pack 3

        http://www.sco.com/support/update/download/osr507list.html

	5.2 Verification

	MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

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

	5.3 Installing Fixed Binaries
	
	See the Maintenance Pack 3 Release Notes

        ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.html
        or
        ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt


6. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0914 http://www.kb.cert.org/vuls/id/734644

	SCO security resources:
		http://www.sco.com/support/security/index.html

	SCO security advisories via email
		http://www.sco.com/support/forums/security.html

	This security fix closes SCO incidents sr886767 fz528463 erg712478.


7. Disclaimer

	SCO 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 SCO
	products.


8. Acknowledgments

	SCO would like to thank CERT and The Internet Software
	Consortium.

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