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			SCO Security Advisory

Subject:		OpenServer 5.0.7 : authsh and backupsh buffer overflow
Advisory number: 	SCOSA-2005.40
Issue date: 		2005 October 20
Cross reference:	sr894990 fz532992 erg712939 sr894993 fz532995 erg712941 CAN-2005-2926
______________________________________________________________________________


1. Problem Description

	iDEFENSE has identified a Buffer Overflow vulnerability in
	SCO Openserver backupsh. The backupsh utility is a standard
	binary distributed with Openserver 5.0.7 and earlier. 

	Local attackers could supply a specially crafted string to 
	overflow a stack buffer and execute arbitrary code with group 
	backup privileges. Successful exploitation of this vulnerability
	will result in execution of arbitrary code with permissions
	of the running process. The binary is setgid backup by
	default and can be used by attackers with a local account
	to gain backup privileges. 

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2005-2926 to this issue.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.7 		/usr/lib/sysadm/authsh
					/usr/lib/sysadm/backupsh

3. Solution

	The proper solution is to install the latest packages.

4. OpenServer 5.0.7

	4.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.40

	4.2 Verification

	MD5 (VOL.000.000) = ebcf85edb0e7c8c0a3af4cec65a27ed7

	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. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2926

	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 sr894990 fz532992
	erg712939 sr894993 fz532995 erg712941.


6. 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.


7. Acknowledgments

	SCO would like to thank iDefense for discovering and reporting
	this weakness.

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