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			SCO Security Advisory

Subject:		UnixWare 7.1.3 Open UNIX 8.0.0 : Sendmail: buffer overflow in versions 8.12.8 and prior.
Advisory number: 	CSSA-2003-SCO.23
Issue date: 		2003 September 22
Cross reference:	sr876458 fz527629 erg712276
______________________________________________________________________________


1. Problem Description

	There is a remotely exploitable vulnerability in sendmail
	that could allow an attacker to gain control of a vulnerable
	sendmail server. 
	
	Due to a variable type conversion problem (char to signed int), 
	sendmail may not adequately check the length of address tokens. 
	A specially crafted email message could trigger a stack overflow. 

	This vulnerability was discovered by Michal Zalewski. 

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2003-0161 to this issue.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	UnixWare 7.1.3 		
	Open UNIX 8.0.0 	

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/CSSA-2003-SCO.23


	4.2 Verification

	MD5 (erg712433.Z) = 67be4523e9286555bc3fbf1a51a6d72c

	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:

	Unknown installation method


5. Open UNIX 8.0.0

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2003-SCO.23


	5.2 Verification

	MD5 (erg712433.Z) = 67be4523e9286555bc3fbf1a51a6d72c

	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:

	Unknown installation method


6. References

	Specific references for this advisory:
		http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0161

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

	This security fix closes SCO incidents sr876458 fz527629
	erg712276.


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 Michal Zalewski for notifying
	Sendmail, Inc., and the Sendmail Consortium.

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