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______________________________________________________________________________

			SCO Security Advisory

Subject:		UnixWare 7.1.1 Open UNIX 8.0.0 : in.talkd format string vulnerabilities
Advisory number: 	CSSA-2002-SCO.42
Issue date: 		2002 November 12
Cross reference:
______________________________________________________________________________


1. Problem Description

	 The in.talkd program is vulnerable to a format string bug
	 which can be exploited remotely. An attacker can request
	 a talk session with a crafted luser field and be able to
	 write memory and gain control of the flow of the in.talkd.
	 This vulnerability can also be exploited with the clt_addr
	 field and its resolved name (in conjuction with a DNS).


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	UnixWare 7.1.1			/usr/sbin/in.otalkd
					/usr/sbin/in.talkd
	Open UNIX 8.0.0			/usr/sbin/in.otalkd
					/usr/sbin/in.talkd

3. Solution

	The proper solution is to install the latest packages.


4. UnixWare 7.1.1

	4.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42


	4.2 Verification

	MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804

	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 erg712055.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712055.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712055.pkg


5. Open UNIX 8.0.0

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42


	5.2 Verification

	MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804

	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 erg712055.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712055.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712055.pkg


6. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1010
		http://www.ngsec.com/docs/advisories/NGSEC-2002-3.txt

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

	This security fix closes SCO incidents sr864879, fz521053,
	erg712055.


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

	It is difficult to say who actually discovered this
	vulnerability. There are many candidates.

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