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______________________________________________________________________________
		   Caldera Systems, Inc.  Security Advisory

Subject:		Buffer overflow in mount/umount
Advisory number: 	CSSA-2000-002.0
Issue date: 		2000 February, 3
Cross reference:
______________________________________________________________________________


1. Problem Description

   A buffer overflow has been found in the mount and umount commands,
   which are setuid root on Caldera OpenLinux. The overflow does not
   appear to be exploitable easily (if at all), but we advise you to
   upgrade to the fixed package nevertheless.

 
2. Vulnerable Versions

   System                       Package
   -----------------------------------------------------------
   OpenLinux Desktop 2.3        All packages previous to
                                util-linux-2.9s-5

   OpenLinux eServer 2.3        All packages previous to
                                util-linux-2.9s-5S


3. Solution

   Workaround:

   If you do not need the user mount feature supported by
   mount and umount (which lets any user mount and unmount
   file systems marked with the "user" keyword in /etc/fstab),
   you can simply remove the setuid bit from both commands:

	chmod u-s /bin/mount /bin/umount


   The proper solution is to upgrade to the fixed packages.

4. OpenLinux Desktop 2.3

   4.1 Location of Fixed Packages

       The upgrade packages can be found on Caldera's FTP site at:

       ftp://ftp.calderasystems.com/pub/openlinux/updates/2.3/current/RPMS/

       The corresponding source code package can be found at:

       ftp://ftp.calderaystems.com/pub/openlinux/updates/2.3/current/SRPMS

   4.2 Verification

       a205c83972e14b748401341387c6bfbc  RPMS/util-linux-2.9s-5.i386.rpm
       4d84c71dcb533bd8d97000138199da71  SRPMS/util-linux-2.9s-5.src.rpm


   4.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

	 rpm -F util-linux-2.9s-5.i386.rpm    	

5. OpenLinux eServer 2.3

   4.1 Location of Fixed Packages

       The upgrade packages can be found on Caldera's FTP site at:

       ftp://ftp.calderasystems.com/pub/eServer/updates/2.3/current/RPMS/

       The corresponding source code package can be found at:

       ftp://ftp.calderaystems.com/pub/eServer/updates/2.3/current/SRPMS

   4.2 Verification

       4a8f8941df47c90e77f1b5d232bfffa0  RPMS/util-linux-2.9s-5S.i386.rpm
       292a86f1ad9e5aca120abfdda101c319  SRPMS/util-linux-2.9s-5S.src.rpm


   4.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

 	 rpm -F util-linux-2.9s-5S.i386.rpm 
   
6. References

   This and other Caldera security resources are located at:

   http://www.calderasystems.com/support/security/index.html

7. Disclaimer

   Caldera Systems, 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 OpenLinux.

______________________________________________________________________________

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