bugtraq - OpenServer 5.0.7 OpenServer 6.0.0 : UnZip File Permissions Change Vulnerability

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Date: Wed, 28 Sep 2005 11:17:01 -0700
From: please_reply_to_security@....com
To: security-announce@...t.sco.com, bugtraq@...urityfocus.com,
	full-disclosure@...ts.grok.org.uk
Subject: OpenServer 5.0.7 OpenServer 6.0.0 : UnZip File
	Permissions Change Vulnerability



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______________________________________________________________________________

			SCO Security Advisory

Subject:		OpenServer 5.0.7 OpenServer 6.0.0 : UnZip File Permissions Change Vulnerability
Advisory number: 	SCOSA-2005.39
Issue date: 		2005 September 28
Cross reference:	sr894724 fz532853 erg712904
			sr894723 fz532852 erg712905
			CAN-2005-2475
______________________________________________________________________________


1. Problem Description

	A vulnerability in unzip can be exploited by malicious,
	local users to perform certain actions on a vulnerable
	system with escalated privileges. The vulnerability is
	caused due a race condition that exists when the uncompressed
	file is closed and before its permissions are changed. This
	can be exploited via hardlink attacks to change the permissions
	of other files belonging to the user running unzip. Successful
	exploitation requires that the malicious user is able to
	delete the uncompressed file and replace it with a hardlink
	to another file owned by the unzip user, before permissions
	are set on the file.

	The Common Vulnerabilities and Exposures project (cve.mitre.org)
	has assigned the name CAN-2005-2475 to this issue.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.7		unzip distribution
	OpenServer 6.0.0 		unzip distribution

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-2005.39/507


	4.2 Verification

	MD5 (VOL.000.000) = d57b8a54b9547bef09ba1f25dbd2cbf1

	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 6.0.0

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.39/600


	5.2 Verification

	MD5 (VOL.000.000) = f31e45c91c87409f487613fdc5c2fb01

	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 a directory

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

6. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2475
		http://marc.theaimsgroup.com/?l=bugtraq&m=112300046224117&w=2
		http://www.securityfocus.com/bid/14450
		http://www.osvdb.org/18530
		http://secunia.com/advisories/16309

	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 sr894724 fz532853
	erg712904 sr894723 fz532852 erg712905.


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 Imran Ghory for discovering this
	weakness.

______________________________________________________________________________

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