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			SCO Security Advisory

Subject:		OpenServer 5.0.7 OpenServer 6.0.0 : REVISED Lynx Multiple Vulnerabilities
Advisory number:	SCOSA-2006.7.1
Issue date:		2006 January 13
Cross reference:	SCOSA-2006.7
			fz533159 fz533314
			CVE-2005-2929 CVE-2005-3120
______________________________________________________________________________


1. Revision Note

	This is a revision of the SCOSA-2006.7 security advisory.
	The -justify option was mistakenly dropped.  This option is now
	reinstated.  Additionally lynx has been updated to version
	2.8.5dev.8.


2. Problem Description

	Lynx NNTP Buffer Overflow Vulnerability:
	
	Ulf Harnhammar has reported a vulnerability in Lynx, which can
	be exploited by malicious people to compromise a user's system.
	
	The vulnerability is caused due to a boundary error in the
	"HTrjis()" function in the handling of article headers sent from
	NNTP (Network News Transfer Protocol) servers. This can be
	exploited to cause a stack-based buffer overflow by e.g.
	tricking a user into visiting a malicious web site which
	redirects to a malicious NNTP server via the "nntp:" URI
	handler.
	
	Successful exploitation allows execution of arbitrary code.
	
	The Common Vulnerabilities and Exposures project (cve.mitre.org)
	has assigned the name CVE-2005-3120 to this issue.
	
	Lynx Command Injection Vulnerability:
	
	Remote exploitation of a command injection vulnerability  could
	allow attackers to execute arbitrary commands with the
	privileges of the underlying user.
	
	The problem specifically exists within the feature to execute
	local cgi-bin programs via the "lynxcgi:" URI handler. The
	handler is generally intended to be restricted to a specific
	directory or program(s). However, due to a configuration error
	on multiple platforms, the default settings allow for arbitrary
	websites to specify commands to run as the user running Lynx.
	
	The Common Vulnerabilities and Exposures project (cve.mitre.org)
	has assigned the name CVE-2005-2929 to this issue.


3. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.7 		/usr/bin/lynx
	OpenServer 6.0.0 		/usr/bin/lynx


4. Solution

	The proper solution is to install the latest packages.


5. OpenServer 5.0.7

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.7.1


	5.2 Verification

	MD5 (p533159.507_vol.tar) = 6be99937d460b7efc822a7c3d59b7ecb

	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 p533159.507_vol.tar file to a directory.

	2) Extract VOL* files.

	   # tar xvf p533159.507_vol.tar

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


6. OpenServer 6.0.0

	6.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.7.1


	6.2 Verification

	MD5 (p533159.600_vol.tar) = 8a93a2fd7458aa8ad23e6695845a9441

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


	6.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	1) Download p533159.600_vol.tar file to a directory.

	2) Extract VOL* files.

	   # tar xvf p533159.600_vol.tar

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


7. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2929
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3120
		http://lists.grok.org.uk/pipermail/full-disclosure/2005-October/038019.html
		http://secunia.com/advisories/17216
		http://securitytracker.com/id?1015065
		http://securitytracker.com/id?1015195
		http://www.idefense.com/application/poi/display?id=338&type=vulnerabilities
		http://www.securityfocus.com/bid/15395

	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 fz533159 fz533314.


8. 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.


9. Acknowledgments

	SCO would like to thank Ulf Harnhammar for reporting the NNTP
	buffer overflow vulnerability.

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