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Category:   OS (UNIX)  >   libc.so.1 Vendors:   Caldera/SCO
Caldera UniwWare 'libc.so.1' Library Function Lets Local Users Execute Arbitrary Code with Elevated Privileges
SecurityTracker Alert ID:  1003459
SecurityTracker URL:  http://securitytracker.com/id/1003459
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Feb 7 2002
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Caldera reported a vulnerability in the library function that processes message catalogs. A local user could execute arbitrary code with elevated privileges.

It is reported that a local user can modify certain environment variables to cause the library functions that manipulate message catalogs to use the user's own message catalogs. This could reportedly cause a memory fault in a set{uid,gid} program, resulting in the execution of arbitrary code with elevated privileges.

The affected file is /usr/lib/libc.so.1

Caldera credits jggm JeGalGhongMyeung with reporting the bug.

Impact:   A local user could cause arbitrary code to be executed with elevated privileges.
Solution:   The vendor has released a fix, available at:

ftp://stage.caldera.com/pub/security/unixware/CSSA-2002-SCO.3/

The verification checksum is:

MD5 (erg711179.Z) = 89b893bc581c8b9601a95a9271268c47

Vendor URL:  www.caldera.com/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (Open UNIX-SCO)
Underlying OS Comments:  7.1.1

Message History:   None.


 Source Message Contents

Subject:  UnixWare 7: message catalog environment variable vulnerabilities


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ftp://stage.caldera.com/pub/security/unixware/CSSA-2002-SCO.3/CSSA-2002-SCO-3.txt
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___________________________________________________________________________

	    Caldera International, Inc. Security Advisory

Subject:		UnixWare 7: message catalog environment variable vulnerabilities
Advisory number: 	CSSA-2002-SCO.3
Issue date: 		2002 February 7
Cross reference:
___________________________________________________________________________


1. Problem Description
	
	The library functions that manipulated message catalogs could
	be subverted via environment variables to use a user's own
	message catalogs, possibly causing a set{uid,gid} program to
	memory fault, allowing the possibility of a privilege
	escalation vulnerability.


2. Vulnerable Supported Versions

	Operating System	Version		Affected Files
	------------------------------------------------------------------
	UnixWare 7		7.1.1		/usr/lib/libc.so.1


3. Workaround

	None.


4. UnixWare 7

  4.1 Location of Fixed Binaries

	ftp://stage.caldera.com/pub/security/unixware/CSSA-2002-SCO.3/


  4.2 Verification

	MD5 (erg711179.Z) = 89b893bc581c8b9601a95a9271268c47

	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 erg711179.Z to the /tmp directory

	# uncompress /tmp/erg711179.Z
	# pkgadd -d /tmp/erg711179


5. References

	This and other advisories are located at
		http://stage.caldera.com/support/security

	This advisory addresses Caldera Security internal incidents
	sr859904, fz512992, erg711179.

6. Disclaimer

	Caldera International, Inc. is not responsible for the misuse
	of any of the information we provide on our website and/or
	through our security advisories. Our advisories are a service
	to our customers intended to promote secure installation and
	use of Caldera International products.


7. Acknowledgements

	Caldera would like to thank jggm JeGalGhongMyeung
	<jggm@mail.com> for the discovery and research of this
	vulnerability.


___________________________________________________________________________

--------------38BE94C93EBCD5285BA0C6CE--



 
 


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