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Category:   Application (Generic)  >   X Vendors:   Caldera/SCO
(Caldera Issues Fix for Open UNIX/UnixWare) Re: Caldera Distribution of XFree86 for OpenLinux Lets Local Users Access Shared Memory to Gain Elevated Privileges
SecurityTracker Alert ID:  1003998
SecurityTracker URL:  http://securitytracker.com/id/1003998
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 9 2002
Impact:   Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Caldera reported a vulnerability in the Xserver package. A local user may be able to gain elevated privileges on the system.

It is reported that any user with local X access can exploit the MIT-SHM extension and gain read/write access to any shared memory segment on the system. No details were provided.

Impact:   A local user may be able to read from or write to shared memory on the server to obtain elevated privileges on the system.
Solution:   The vendor has issued a fix.

For Open UNIX 8.0.0:

ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14

The verification checksum is:

MD5 (xserver.800a.pkg) = 471bd0d4c43b32d4b04003d78a218c97

Upgrade the affected binaries with the following commands:

Download xserver.800a.pkg to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/xserver.800a.pkg


For UnixWare 7.1.1:

ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14

The verification checksum is:

MD5 (xserver.711b.pkg) = 545aafcdcfff532ed25dbffea0d06336

Upgrade the affected binaries with the following commands:

Download xserver.711b.pkg to the /var/spool/pkg directory

# pkgadd -d /var/spool/pkg/xserver.711b.pkg

Vendor URL:  www.calderasystems.com/support/security/ (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (Open UNIX-SCO)
Underlying OS Comments:  UnixWare 7.1.1, Open UNIX 8.0.0

Message History:   This archive entry is a follow-up to the message listed below.
Apr 1 2002 Caldera Distribution of XFree86 for OpenLinux Lets Local Users Access Shared Memory to Gain Elevated Privileges



 Source Message Contents

Subject:  CSSA-2002-SCO.14.txt


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______________________________________________________________________________

		Caldera International, Inc.  Security Advisory

Subject:		Open UNIX 8.0.0 UnixWare 7.1.1 : X server allows access to any shared memory on the system
Advisory number: 	CSSA-2002-SCO.14
Issue date: 		2002 April 08
Cross reference:
______________________________________________________________________________


1. Problem Description

	Any user with local X access can exploit the MIT-SHM extension
	and gain read/write access to any shared memory segment on
	the system.


2. Vulnerable Supported Versions

	System				Package
	----------------------------------------------------------------------
	Open UNIX 8.0.0 		xserver
	UnixWare 7.1.1 			xserver


3. Solution

	The proper solution is to install the latest packages.


4. Open UNIX 8.0.0

	4.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14


	4.2 Verification

	MD5 (xserver.800a.pkg) = 471bd0d4c43b32d4b04003d78a218c97

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


	4.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following commands:

	Download xserver.800a.pkg to the /var/spool/pkg directory

	# pkgadd -d /var/spool/pkg/xserver.800a.pkg


5. UnixWare 7.1.1

	5.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.14


	5.2 Verification

	MD5 (xserver.711b.pkg) = 545aafcdcfff532ed25dbffea0d06336

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


	5.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following commands:

	Download xserver.711b.pkg to the /var/spool/pkg directory

	# pkgadd -d /var/spool/pkg/xserver.711b.pkg


6. References

	Specific references for this advisory:
		none

	Caldera UNIX security resources:
		http://stage.caldera.com/support/security/

	Caldera OpenLinux security resources:
		http://www.caldera.com/support/security/index.html

	This security fix closes Caldera incidents sr860994, fz520243
	and erg711973.


7. Disclaimer

	Caldera International, Inc. 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 Caldera products.


8. Acknowledgements

	Roberto Zunino discovered and researched this vulnerability.

______________________________________________________________________________

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