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			SCO Security Advisory

Subject:		Linux: Preboot eXecution Environment (PXE) server denial-of-service attacks 
Advisory number: 	CSSA-2002-044.0
Issue date: 		2002 November 11
Cross reference:
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1. Problem Description

	The PXE server can be crashed by using corrupt DHCP packets.
	This bug could be used to cause a denial-of-service attack.


2. Vulnerable Supported Versions

	System				Package
	----------------------------------------------------------------------

	OpenLinux 3.1.1 Server		prior to pxe-0.1-33.i386.rpm

	OpenLinux 3.1.1 Workstation	prior to pxe-0.1-33.i386.rpm

	OpenLinux 3.1 Server		prior to pxe-0.1-33.i386.rpm

	OpenLinux 3.1 Workstation	prior to pxe-0.1-33.i386.rpm


3. Solution

	The proper solution is to install the latest packages. Many
	customers find it easier to use the Caldera System Updater, called
	cupdate (or kcupdate under the KDE environment), to update these
	packages rather than downloading and installing them by hand.


4. OpenLinux 3.1.1 Server

	4.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2002-044.0/RPMS

	4.2 Packages

	75380c0629500bcb6ac3185fd7f68cf9	pxe-0.1-33.i386.rpm

	4.3 Installation

	rpm -Fvh pxe-0.1-33.i386.rpm

	4.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2002-044.0/SRPMS

	4.5 Source Packages

	dc85c1098a2835660007665df6140570	pxe-0.1-33.src.rpm


5. OpenLinux 3.1.1 Workstation

	5.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2002-044.0/RPMS

	5.2 Packages

	bfb9e544055e16500098a9fd1c058a7c	pxe-0.1-33.i386.rpm

	5.3 Installation

	rpm -Fvh pxe-0.1-33.i386.rpm

	5.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2002-044.0/SRPMS

	5.5 Source Packages

	1e6e6cdb4485ad55d7618ae59bb34f5a	pxe-0.1-33.src.rpm


6. OpenLinux 3.1 Server

	6.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2002-044.0/RPMS

	6.2 Packages

	84544318a2f9cf2f439aecf928ae3a64	pxe-0.1-33.i386.rpm

	6.3 Installation

	rpm -Fvh pxe-0.1-33.i386.rpm

	6.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2002-044.0/SRPMS

	6.5 Source Packages

	b740f40b65ec56bbfa8c59439487f7a3	pxe-0.1-33.src.rpm


7. OpenLinux 3.1 Workstation

	7.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2002-044.0/RPMS

	7.2 Packages

	0dffc10145ab632ed3190429d445cfdf	pxe-0.1-33.i386.rpm

	7.3 Installation

	rpm -Fvh pxe-0.1-33.i386.rpm

	7.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2002-044.0/SRPMS

	7.5 Source Packages

	e7f92ace6e801f23251fd00a1a76dd98	pxe-0.1-33.src.rpm


8. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0835
		http://www.redhat.com/support/errata/RHSA-2002-162.html

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

	This security fix closes SCO incidents sr867513, fz525783,
	erg501646.


9. 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.

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