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______________________________________________________________________________
                   Caldera International, Inc. Security Advisory

Subject: Linux - IMP/HORDE cross site scripting vulnerability
Advisory number: CSSA-2001-039.0
Issue date: 2001, November 22
Cross reference:
______________________________________________________________________________

1. Problem Description

   The webmail frontend IMP has a cross site scripting problem, allowing
   a remote attacker to send you an E-mail with a malformed URL that when
   clicked on will open your mail session to the attacker, allowing him
   to read and delete your E-mails.

2. Vulnerable Versions

   System Package
   -----------------------------------------------------------
   OpenLinux 2.3 not vulnerable

   OpenLinux eServer 2.3.1 not vulnerable
   and OpenLinux eBuilder

   OpenLinux eDesktop 2.4 not vulnerable

   OpenLinux Server 3.1 All packages previous to
                                 horde-1.2.7-1
                                   imp-2.2.7-1
                                
   OpenLinux Workstation 3.1 not vulnerable

3. Solution

   Workaround

     none

   The proper solution is to upgrade to the latest packages.

4. OpenLinux 2.3

    not vulnerable

5. OpenLinux eServer 2.3.1 and OpenLinux eBuilder for ECential 3.0

    not vulnerable

6. OpenLinux eDesktop 2.4

    not vulnerable

7. OpenLinux 3.1 Server

    7.1 Location of Fixed Packages

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

       ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/RPMS

       The corresponding source code package can be found at:

       ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/SRPMS

   7.2 Verification

       53a9d75c760851f79fa72cb451416f96 RPMS/horde-1.2.7-1.i386.rpm
       4bb1af4dcd98af6f168543476f691b95 RPMS/imp-2.2.7-1.i386.rpm
       d81a0095d83a4f9a7751c923f6afaf71 SRPMS/horde-1.2.7-1.src.rpm
       a1eeaf8781edc12f8c90386cd289e0a6 SRPMS/imp-2.2.7-1.src.rpm

   7.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

         rpm -Fvh horde-1.2.7-1.i386.rpm imp-2.2.7-1.i386.rpm

       Update notes:

       If horde was activated in the apache module
       "/etc/httpd/modules/mod_php4_horde.conf" you will have to
       reconfigure it by changing "deny from all" to "allow from all".

       Do not run "/usr/lib(exec)/horde/horde.setup" if you already have
       started the script before the update. If you run the script again,
       all passwords will be changed back to the default value and you
       will have to change them manually in
       "/home/httpd/html/horde/imp/config/defaults.php3" and
       "/home/httpd/phplib/local.inc"

8. OpenLinux 3.1 Workstation

    not vulnerable

9. References

   This and other Caldera security resources are located at:

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

   This security fix closes Caldera's internal Problem Report 10931.

10. 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 OpenLinux.

11. Acknowledgements

   Caldera International wishes to thank Joao Pedro Goncalves for reporting
   this problem, and the Horde Project for promptly fixing it.
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