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______________________________________________________________________________

			SCO Security Advisory

Subject:		OpenServer 5.0.6 : REVISED: IPFilter may incorrectly pass packets
Advisory number: 	CSSA-2002-SCO.9.1
Issue date: 		2002 October 18
Cross reference:	CSSA-2002-SCO.9
______________________________________________________________________________


1. Problem Description

	When matching a packet fragment, insufficient checks were
	performed to ensure the fragment is valid. Malicious remote
	users may be able to bypass filtering rules, allowing them
	to potentially circumvent the firewall.

	The previous fix introduced a problem printing timestamps
	correctly, as well as a problem resetting statistic counters
	after they reached their maximum.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.6		/etc/ipfstat
					/etc/conf/pack.d/ipl/Driver.o
					/etc/ipf
					/etc/ipnat
					/etc/ipmon
					/etc/ipfnat


3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.6

	4.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.9.1


	4.2 Verification

	MD5 (VOL.000.000) = 9fbdd9c0732dce599d8cb1586b15eb17

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


	4.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	1) OpenServer 5.0.6a is required for this update. Or, the
	   CSSA-2002-SCO-39 security supplement can be added, to
	   provide the requisite libraries. 

	2) Download the VOL* files to the /tmp directory

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

	4) Rebuild the operating system by executing

		/etc/conf/cf.d/link_unix -y

	5) Reboot the system.


5. References

	Specific references for this advisory:
		none

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

	This security fix closes SCO incidents sr870538, fz521495,
	erg501625.


6. 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.


7. Acknowledgements

	SCO would like to admit borrowing the problem description
	text from FreeBSD security advisory FreeBSD-SA-01:32.

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