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Category:   OS (UNIX)  >   Sar Vendors:   Caldera/SCO
Caldera OpenServer System Activity Reporter (sar) Command Line Buffer Overflow May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1004203
SecurityTracker URL:  http://securitytracker.com/id/1004203
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 1 2002
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A buffer overflow was reported in the system activity reporter (sar) utility on Caldera's OpenServer. A local user could gain elevated privileges.

Caldera reports that a local user can supply a long argument to the -o command line option of the /usr/bin/sar command to cause a memory fault. This could allow a local user to execute arbitrary code to obtain elevated privileges.

The sar binary may be configured with set user id (suid) 'mem' privileges.

The following binaries are affected:

/usr/bin/sar
/usr/lib/sa/sadc
/usr/bin/cpusar
/usr/bin/mpsar

Caldera credits KF with reporting the flaw.

Impact:   A local user may be able to execute arbitrary code with 'mem' user privileges.
Solution:   The vendor has issued updated packages for OpenServer 5.0.5, available at:

ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.17

The verification checksum is:

MD5 (VOL.000.000) = f912fe801263863956c257c4ef395570

To install, upgrade the affected binaries with the following commands:

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

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

Vendor URL:  stage.caldera.com/support/security/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (Open UNIX-SCO)
Underlying OS Comments:  OpenServer 5.0.5

Message History:   None.


 Source Message Contents

Subject:  Caldera OpenServer sar -o buffer overflow


This is a multi-part message in MIME format.
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Content-Transfer-Encoding: 7bit

ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.17/CSSA-2002-SCO.17.txt
--------------0BC32DF571D93A6017486787
Content-Type: text/plain; charset=us-ascii;
 name="CSSA-2002-SCO.17.txt"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="CSSA-2002-SCO.17.txt"


______________________________________________________________________________

		Caldera International, Inc.  Security Advisory

Subject:		OpenServer 5.0.5 : sar -o buffer overflow
Advisory number: 	CSSA-2002-SCO.17
Issue date: 		2002 May 01
Cross reference:
______________________________________________________________________________


1. Problem Description

	If the /usr/bin/sar command is given an exceedingly long
	argument to the o option, it will memory fault. This could
	allow a malicious user to elevate their permissions.


2. Vulnerable Supported Versions

	System				Binary
	----------------------------------------------------------------------
	OpenServer 5.0.5		/usr/bin/sar
					/usr/lib/sa/sadc
					/usr/bin/cpusar
					/usr/bin/mpsar

3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.5

	4.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.17


	4.2 Verification

	MD5 (VOL.000.000) = f912fe801263863956c257c4ef395570

	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:

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

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


5. 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 sr862424, fz520480,
	erg712003.


6. 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.


7. Acknowledgements

	Caldera would like to thank KF <dotslash@snosoft.com> for
	discovering this problem, researching it, and alerting us.
	And being patient, too.

______________________________________________________________________________

--------------0BC32DF571D93A6017486787--



 
 


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