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______________________________________________________________________________
                   Caldera Systems, Inc.  Security Advisory
 
Subject:                format bug in LPRng
Advisory number:        CSSA-2000-033.0
Issue date:             2000 September, 25
Cross reference:
______________________________________________________________________________
 
 
1. Problem Description
 
   There is a format bug in the LPRng printer daemon that could
   possibly be exploited to obtain root privilege. This problem
   is particulary severe because it can be exercised remotely.
 
   We are not aware of any exploits for this bug yet.
 
2. Vulnerable Versions
 
   System                       Package
   -----------------------------------------------------------
   OpenLinux Desktop 2.3        All packages previous to
                                LPRng-3.5.3-3

   OpenLinux eServer 2.3        All packages previous to
   and OpenLinux eBuilder       LPRng-3.5.3-3

   OpenLinux eDesktop 2.4       All packages previous to
                                LPRng-3.5.3-3

3. Solution

   Workaround:

   None known. 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/updates/OpenLinux/2.3/current/RPMS/

       The corresponding source code package can be found at:

       ftp://ftp.calderasystems.com/pub/updates/OpenLinux/2.3/current/SRPMS

   4.2 Verification

       3ad5e8e8ab42d2ed1cce0627ca2a0f45  RPMS/LPRng-3.5.3-3.i386.rpm
       61f4d3aef6757c68ba73cc1cc8bbcf27  RPMS/LPRng-doc-3.5.3-3.i386.rpm
       ebd7e8ec09ef4d92397f608b1125ff82  RPMS/LPRng-doc-ps-3.5.3-3.i386.rpm
       c53c9a83c0791030297b6079d7b9fcd9  RPMS/LPRng-lpd-3.5.3-3.i386.rpm
       d266aed344873c9ff6aab2a409d760b4  SRPMS/LPRng-3.5.3-3.src.rpm

   4.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

          rpm -Fhv LPRng-*.i386.rpm

       Stop and restart the lpd service using

          /etc/rc.d/init.d/lpd stop
          /etc/rc.d/init.d/lpd start

5. OpenLinux eServer 2.3 and OpenLinux eBuilder for ECential 3.0

   5.1 Location of Fixed Packages

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

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

       The corresponding source code package can be found at:

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

   5.2 Verification

       9cb7089adcadcf29ee2cb8268acc46c1  RPMS/LPRng-3.5.3-3.i386.rpm
       77e9edbf336837a9957c3fc62167aee4  RPMS/LPRng-doc-3.5.3-3.i386.rpm
       558a98c48558538bc15f86ca9a555e68  RPMS/LPRng-doc-ps-3.5.3-3.i386.rpm
       62c39c60197447be1b4de85f81bcd5a0  RPMS/LPRng-lpd-3.5.3-3.i386.rpm
       d266aed344873c9ff6aab2a409d760b4  SRPMS/LPRng-3.5.3-3.src.rpm

   5.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

          rpm -Fhv LPRng-*.i386.rpm

       Stop and restart the lpd service using

          /etc/rc.d/init.d/lpd stop
          /etc/rc.d/init.d/lpd start

6. OpenLinux eDesktop 2.4

   6.1 Location of Fixed Packages

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

       ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/RPMS/

       The corresponding source code package can be found at:

       ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/SRPMS

   6.2 Verification

       7ec1973e306bbcaa3e27b770b463e6fe  RPMS/LPRng-3.5.3-3.i386.rpm
       f373e0a2389c64e207b84293d2afc177  RPMS/LPRng-doc-3.5.3-3.i386.rpm
       4560b0415dc7dbf7bde284173a49c6f6  RPMS/LPRng-doc-ps-3.5.3-3.i386.rpm
       994f2204ba1e743725fe69cecb47dac5  RPMS/LPRng-lpd-3.5.3-3.i386.rpm
       d266aed344873c9ff6aab2a409d760b4  SRPMS/LPRng-3.5.3-3.src.rpm

   6.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

          rpm -Fhv LPRng-*.i386.rpm

       Stop and restart the lpd service using

          /etc/rc.d/init.d/lpd stop
          /etc/rc.d/init.d/lpd start

7. References

   This and other Caldera security resources are located at:

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

   This security fix closes Caldera's internal Problem Report 7877.

8. 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.

9. Acknowledgements

   Caldera Systems wishes to thank Chris Evans for finding and
   reporting this bug.