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Caldera Systems Security Advisory: kdelibs vulnerability for setuid KDE applications

Jun 07, 2000, 05:20 (0 Talkback[s])

Caldera Systems, Inc. Security Advisory

Subject:                kdelibs vulnerability for setuid KDE applications
Advisory number:        CSSA-2000-015.0
Issue date:             2000 June, 02
Cross reference:        

1. Problem Description

There is a very serious vulnerability in the way KDE starts applications that allows local users to take over any file in the system by exploiting setuid root KDE application.

The only vulnerable application shipped with OpenLinux is kISDN, but third party software might be vulnerable too.

There is currently no fix available.

2. Vulnerable Versions

   System                       Package

   OpenLinux Desktop 2.3        no vulnerable packages included

   OpenLinux eServer 2.3        no vulnerable packages included
   and OpenLinux eBuilder       

   OpenLinux eDesktop 2.4       kISDN
3. Solution

Workaround:

If you do not need kISDN, deinstall it by issuing as root:

rpm -e kisdn

If you need kISDN on a multiuser workstation:

Disable the suid-root sbit by doing as root:

chmod u-s /opt/kde/bin/kisdn

   You can still use kisdn by issuing in a terminal window:
      $ su -p
      Password: 
      # kisdn &
Also check your system for any other KDE application you have installed from third party sources and remove their suid bits as shown above.

4. OpenLinux Desktop 2.3

no vulnerable packages included, but third party KDE applications might be vulnerable.

5. OpenLinux eServer 2.3 and OpenLinux eBuilder for ECential 3.0

no vulnerable packages included, but third party KDE applications might be vulnerable.

6. OpenLinux eDesktop 2.4

See the workaround above.

7. References

This and other Caldera security resources are located at:

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

This security fix refers to Caldera's internal Problem Report 6806.

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 Sebastian "Stealth" Krahmer for discovering and reporting the bug.