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______________________________________________________________________________

			SCO Security Advisory

Subject:		UnixWare 7.1.3 UnixWare 7.1.1 : Vulnerabilities in long-lived TCP connections / Rose attack
Advisory number: 	SCOSA-2005.14
Issue date: 		2005 February 07
Cross reference:	sr890247 fz529384 erg712598 sr890286 fz529414 erg712605
______________________________________________________________________________


1. Problem Description

	TCP, when using a large Window Size, makes it easier for
	remote attackers to guess sequence numbers and cause a
	denial of service (connection loss) to persistent TCP
	connections by repeatedly injecting a TCP RST packet,
	especially in protocols that use long-lived connections,
	such as BGP. 

	Reference : NISCC Vulnerability Advisory 236929
	Reference : CERT Technical Cyber Security Alert TA04-111A

	The Common Vulnerabilities and Exposures project (cve.mitre.org)
	has assigned the name CAN-2004-0230 to this issue.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	UnixWare 7.1.3 			/etc/conf/pack.d/inet/Driver_atup.o
					/etc/conf/pack.d/inet/Driver_mp.o
					/etc/conf/pack.d/inet/space.c
					/usr/include/netinet/ip_var.h

	UnixWare 7.1.1 			/etc/conf/pack.d/inet/Driver_atup.o
					/etc/conf/pack.d/inet/Driver_mp.o
					/etc/conf/pack.d/inet/space.c
					/usr/include/netinet/ip_var.h

3. Solution

	The proper solution is to install the latest packages.


4. UnixWare 7.1.3

	4.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.14

	4.2 Verification

	MD5 (erg712598.pkg.Z) = c037e34427caf7f752eac2680f7dd29a

	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:

	Download erg712598.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712598.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712598.pkg


5. UnixWare 7.1.1

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.14


	5.2 Verification

	MD5 (erg712598.711.pkg.Z) = 010281cae30aec75daa9b03b1ebbb522

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


	5.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	Download erg712598.711.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712598.711.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712598.711.pkg


6. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0230 
		http://www.uniras.gov.uk/niscc/docs/al-20040420-00199.html?lang=en 
		http://www.us-cert.gov/cas/techalerts/TA04-111A.html

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

	SCO security advisories via email
		http://www.sco.com/support/forums/security.html

	This security fix closes SCO incidents sr890247 fz529384
	erg712598 sr890286 fz529414 erg712605.


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. Acknowledgments

	SCO would like to thank NISCC, Steve Bellovin, Rob Thomas
	and Paul Watson, Cisco Systems Inc. and Juniper Networks
	Inc.

______________________________________________________________________________

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