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______________________________________________________________________________

		Caldera International, Inc.  Security Advisory

Subject:		Linux: dhcpd dynamic DNS format string vulnerability
Advisory number: 	CSSA-2002-028.0
Issue date: 		2002 June 19
Cross reference:
______________________________________________________________________________


1. Problem Description

	A remote exploitable format string vulnerability was found in
	the logging routines of the dynamic DNS code of dhcpd. This
	vulnerability can allow an attacker to get root access to the
	host running dhcpd.


2. Vulnerable Supported Versions

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

	OpenLinux 3.1.1 Server		prior to dhcp-3.0b2pl9-11.i386.rpm
					prior to dhcp-server-3.0b2pl9-11.i386.rpm

	OpenLinux 3.1.1 Workstation	prior to dhcp-3.0b2pl9-11.i386.rpm

	OpenLinux 3.1 Server		prior to dhcp-3.0b2pl9-11.i386.rpm
					prior to dhcp-server-3.0b2pl9-11.i386.rpm

	OpenLinux 3.1 Workstation	prior to dhcp-3.0b2pl9-11.i386.rpm


3. Solution

	The proper solution is to install the latest packages.


4. OpenLinux 3.1.1 Server

	4.1 Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Server/current/RPMS

4.2 Packages

	09faf40bb1b20919080b3a3ed36d8081	dhcp-3.0b2pl9-11.i386.rpm
	55c93437d6573cb8132a16ccd2c6c69e	dhcp-server-3.0b2pl9-11.i386.rpm

	4.3 Installation

	rpm -Fvh dhcp-3.0b2pl9-11.i386.rpm
	rpm -Fvh dhcp-server-3.0b2pl9-11.i386.rpm

	4.4 Source Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Server/current/SRPMS

4.5 Source Packages

	d767e875975fcc76c912f9e41e4d83cf	dhcp-3.0b2pl9-11.src.rpm


5. OpenLinux 3.1.1 Workstation

	5.1 Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Workstation/current/RPMS

5.2 Packages

	b28af5a9d9aff4f79b683a3187d09545	dhcp-3.0b2pl9-11.i386.rpm

	5.3 Installation

	rpm -Fvh dhcp-3.0b2pl9-11.i386.rpm

	5.4 Source Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1.1/Workstation/current/SRPMS

5.5 Source Packages

	9a2f6bf27b28c5033353caceb1540979	dhcp-3.0b2pl9-11.src.rpm


6. OpenLinux 3.1 Server

	6.1 Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/RPMS

6.2 Packages

	732ba73b4108dd30d5bd3704ad8e47be	dhcp-3.0b2pl9-11.i386.rpm
	d2591a5b6021b2512603963e8f48c422	dhcp-server-3.0b2pl9-11.i386.rpm

	6.3 Installation

	rpm -Fvh dhcp-3.0b2pl9-11.i386.rpm
	rpm -Fvh dhcp-server-3.0b2pl9-11.i386.rpm

	6.4 Source Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/SRPMS

6.5 Source Packages

	d8fd6b2a37fc3315fef9c873cea1172e	dhcp-3.0b2pl9-11.src.rpm


7. OpenLinux 3.1 Workstation

	7.1 Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/RPMS

7.2 Packages

	d60a246831ce062e2b4228b2d6946c7b	dhcp-3.0b2pl9-11.i386.rpm

	7.3 Installation

	rpm -Fvh dhcp-3.0b2pl9-11.i386.rpm

	7.4 Source Package Location

	ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/SRPMS

7.5 Source Packages

	7c1642355347a47278dbd1afd6d3d44f	dhcp-3.0b2pl9-11.src.rpm


8. References

	Specific references for this advisory:
		http://www.cert.org/advisories/CA-2002-12.html Caldera security resources:
		http://www.caldera.com/support/security/index.html

This security fix closes Caldera incidents sr864837, fz521045,
	erg712050.


9. 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.


10. Acknowledgements

	This vulnerability was dicovered and researched by Next Generation
	Security Technologies.