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			SCO Security Advisory

Subject:		OpenLinux: Linux NFS utils package contains remotely exploitable off-by-one bug
Advisory number: 	CSSA-2003-037.0
Issue date: 		2003 November 17
Cross reference:	sr882699 fz528148 erg712382
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1. Problem Description

	Janusz Niewiadomski has discovered an off-by-one overflow in
	xlog() in the nfs-utils package. It is rumoured this bug is
	exploitable, however as it writes a single zero byte to memory,
	an exploit may be difficult to write. 

	CAN-2003-0252 Off-by-one error in the xlog function of mountd 
	in the Linux NFS utils package (nfs-utils) before 1.0.4 allows 
	remote attackers to cause a denial of service and possibly execute 
	arbitrary code via certain RPC requests to mountd that do not 
	contain newlines.


2. Vulnerable Supported Versions

	System				Package
	----------------------------------------------------------------------
	OpenLinux 3.1.1 Server		prior to nfs-0.2.1-12.i386.rpm
					prior to nfs-lockd-0.2.1-12.i386.rpm
					prior to nfs-server-0.2.1-12.i386.rpm

	OpenLinux 3.1.1 Workstation	prior to nfs-0.2.1-12.i386.rpm
					prior to nfs-lockd-0.2.1-12.i386.rpm
					prior to nfs-server-0.2.1-12.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-2003-037.0/RPMS

	4.2 Packages

	30ea43154970596e70e4fe28d975384e	nfs-0.2.1-12.i386.rpm
	680b5214c57a02e1265229458ae881d3	nfs-lockd-0.2.1-12.i386.rpm
	32ee130750f4502fc5bfb51ed46bbbd9	nfs-server-0.2.1-12.i386.rpm

	4.3 Installation

	rpm -Fvh nfs-0.2.1-12.i386.rpm
	rpm -Fvh nfs-lockd-0.2.1-12.i386.rpm
	rpm -Fvh nfs-server-0.2.1-12.i386.rpm

	4.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-037.0/SRPMS

	4.5 Source Packages

	da4e028d9ffe374c7be7e24ffad2b360	nfs-0.2.1-12.src.rpm


5. OpenLinux 3.1.1 Workstation

	5.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-037.0/RPMS

	5.2 Packages

	40c11bad18969b6587a9d94b79c2e41c	nfs-0.2.1-12.i386.rpm
	f98629ebc8412a30a1ab6fe16ea55f77	nfs-lockd-0.2.1-12.i386.rpm
	6407294bbb284c9e42f2769ef9941e8a	nfs-server-0.2.1-12.i386.rpm

	5.3 Installation

	rpm -Fvh nfs-0.2.1-12.i386.rpm
	rpm -Fvh nfs-lockd-0.2.1-12.i386.rpm
	rpm -Fvh nfs-server-0.2.1-12.i386.rpm

	5.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-037.0/SRPMS

	5.5 Source Packages

	f47fea29ce99c7979c50ffb3e91ddf99	nfs-0.2.1-12.src.rpm


6. References

	Specific references for this advisory:
		http://marc.theaimsgroup.com/?l=bugtraq&m=105839032403325&w=2
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0252

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

	This security fix closes SCO incidents sr882699 fz528148
	erg712382.


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. Acknowledgements

	SCO would like to thank Janusz Niewiadomski for reporting this issue.

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