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[SCO] Schwachstelle in tcp_sec - CSSA-2003-019.0



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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgende Warnung von Caldera International
Inc. ueber Sicherheitsprobleme bei "tcp_sec". Wir geben diese
Informationen unveraendert an Sie weiter.

Durch einen Fehler im Paket tcp_sec werden eingehende TCP-Pakete mit
gleichzeitig gesetztem SYN- und FIN-Flag nicht verworfen. Somit
koennte es einem Angreifer gelingen, mit solchen Paketen die Regeln
einer Firewall zu umgehen.

Betroffen ist

tcp_sec		bis ausschliesslich tcp_sec-1.0-1.i386.rpm

in

OpenLinux 3.1 Server und Workstation
OpenLinux 3.1.1 Server und Workstation

(c) der deutschen Zusammenfassung bei DFN-CERT GmbH; die Verbreitung,
auch auszugsweise, ist nur unter Hinweis auf den Urheber, DFN-CERT
GmbH, und nur zu nicht kommerziellen Zwecken gestattet.

Mit freundlichen Gruessen,

	Marco Thorbruegge, DFN-CERT

- -- 
Marco Thorbruegge        |              mailto:thorbruegge@xxxxxxxxxxx
DFN-CERT GmbH            |          http://www.cert.dfn.de/team/matho/
Heidenkampsweg 41        |                    Phone: +49(40)808077-555
D-20097 Hamburg/Germany  |                      FAX: +49(40)808077-556
PGP-Key: 0xAE662425 Fingerpr.: 7E5C A77A F91D 63D1 02AB 9526 53FF F1A0 

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______________________________________________________________________________

			SCO Security Advisory

Subject:		OpenLinux: tcp SYN with FIN packets are not discarded
Advisory number: 	CSSA-2003-019.0
Issue date: 		2003 April 28
Cross reference:
______________________________________________________________________________


1. Problem Description

	Allowing TCP packets with both the SYN and FIN bits set
	significantly improve an attacker's chances of circumventing
	a firewall.


2. Vulnerable Supported Versions

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

	OpenLinux 3.1.1 Server		prior to tcp_sec-1.0-1.i386.rpm

	OpenLinux 3.1.1 Workstation	prior to tcp_sec-1.0-1.i386.rpm

	OpenLinux 3.1 Server		prior to tcp_sec-1.0-1.i386.rpm

	OpenLinux 3.1 Workstation	prior to tcp_sec-1.0-1.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-2003-019.0/RPMS

	4.2 Packages

	57270040e72d49ac888b9967cc86cac8	tcp_sec-1.0-1.i386.rpm

	4.3 Installation

	rpm -Fvh tcp_sec-1.0-1.i386.rpm

	4.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-019.0/SRPMS

	4.5 Source Packages

	acee43450be1a90b11bfc6049e9b788e	tcp_sec-1.0-1.src.rpm


5. OpenLinux 3.1.1 Workstation

	5.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-019.0/RPMS

	5.2 Packages

	24b4643542d6c0fbd6b8dc18462fb99e	tcp_sec-1.0-1.i386.rpm

	5.3 Installation

	rpm -Fvh tcp_sec-1.0-1.i386.rpm

	5.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-019.0/SRPMS

	5.5 Source Packages

	a20384e0690e90a6d0528dd3bb4b9843	tcp_sec-1.0-1.src.rpm


6. OpenLinux 3.1 Server

	6.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2003-019.0/RPMS

	6.2 Packages

	bcd89ad8d189087628d0d00141a768ef	tcp_sec-1.0-1.i386.rpm

	6.3 Installation

	rpm -Fvh tcp_sec-1.0-1.i386.rpm

	6.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2003-019.0/SRPMS

	6.5 Source Packages

	99a233d89194694c0504bdcd87a98561	tcp_sec-1.0-1.src.rpm


7. OpenLinux 3.1 Workstation

	7.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2003-019.0/RPMS

	7.2 Packages

	afa62e4d5dedf317f7200fcaa8e24eda	tcp_sec-1.0-1.i386.rpm

	7.3 Installation

	rpm -Fvh tcp_sec-1.0-1.i386.rpm

	7.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2003-019.0/SRPMS

	7.5 Source Packages

	55168baaa23dae4c3344dd0af1dbde96	tcp_sec-1.0-1.src.rpm


8. References

	Specific references for this advisory:

		http://www.securityfocus.com/archive/1/296122/2002-10-19/2002-10-25/2
		http://www.kb.cert.org/vuls/id/464113

	SCO security resources:

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

	This security fix closes SCO incidents sr876423, fz527624,
	erg712275.


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.


10. Acknowledgements

	Paul Starzetz discovered and researched this vulnerability.

______________________________________________________________________________
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