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			SCO Security Advisory

Subject:		OpenServer 5.0.6 OpenServer 5.0.7 : Xsco contains a buffer overflow that could be exploited to gain root privileges.
Advisory number: 	SCOSA-2004.3
Issue date: 		2004 July 29
Cross reference:	sr889371 fz528866 erg712547 CAN-2004-0083 CAN-2004-0084 CAN-2004-0106
______________________________________________________________________________


1. Problem Description

	A buffer overflow in ReadFontAlias from dirfile.c of Xsco
	may allow local users and remote attackers to execute 
	arbitrary code via a font alias file with a long token. 

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2004-0083 to this issue. 

	Buffer overflow in the ReadFontAlias function in Xsco,
	when using the CopyISOLatin1Lowered function, may allow
	local or remote authenticated users to execute arbitrary 
	code via a malformed entry in the font alias file. 

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2004-0084 to this issue.

	Multiple flaws in reading font files.

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2004-0106 to these issues.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.6 		/usr/bin/X11/Xsco
	OpenServer 5.0.7		/usr/bin/X11/Xsco 

3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.6 

	4.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.3

	4.2 Verification

	MD5 (VOL.000.000) = 7341b2e45bfc55b838009d8a1c49d000

	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:

	1) Download the VOL* files to a directory

	2) Run the custom command, specify an install from media
	images, and specify the directory as the location of
	the images.


5. OpenServer 5.0.7

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.3

	The fixes are also available in SCO OpenServer Release 5.0.7
        Maintenance Pack 3 or later.  See
        http://www.sco.com/support/update/download/osr507list.html.

	5.2 Verification

	MD5 (VOL.000.000) = 7341b2e45bfc55b838009d8a1c49d000

	MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

	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:

	1) Download the VOL* files to the /tmp directory

	2) Run the custom command, specify an install from media
	images, and specify the /tmp directory as the location of
	the images.

	Or see the Maintenance Pack 3 Release and Installation Notes at

        ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt


6. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0083 
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0084
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0106

	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 sr889371 fz528866
	erg712547.


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

	Greg MacManus (iDEFENSE Labs) is credited with the discovery
	of this vulnerability.  Additionally David Dawes discovered
	further flaws in reading font files.

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