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______________________________________________________________________________
                   Caldera International, Inc. Security Advisory

Subject: Linux - Local vulnerability in OpenSSH
Advisory number: CSSA-2001-042.1
Issue date: 2001, December 14
Cross reference: CSSA-2001-042.0
______________________________________________________________________________

1. Problem Description

   This is a revised advisory for the 'UseLogin' vulnerability.
   The original advisory declared the vulnerability as a remote
   vulnerability, which is not the case. The vulnerability requires the
   attacker to have a local account, making it a local vulnerability.

   The OpenSSH team has reported a vulnerability in the OpenSSH server
   that allows local users to obtain root privilege if the server
   has the UseLogin option enabled. This option is off by default on
   OpenLinux, so a default installation is not vulnerable.

   We nevertheless recommend to our customers to upgrade to the fixed
   package.

2. Vulnerable Versions

   System Package
   -----------------------------------------------------------
   OpenLinux 2.3 not vulnerable
   
   OpenLinux eServer 2.3.1 All packages previous to
   and OpenLinux eBuilder openssh-2.9p2-4
   
   OpenLinux eDesktop 2.4 All packages previous to
                                 openssh-2.9p2-4
   
   OpenLinux Server 3.1 All packages previous to
                                 openssh-2.9p2-4
   
   OpenLinux Workstation 3.1 All packages previous to
                                 openssh-2.9p2-4
   

3. Solution

   Workaround

     Make sure that you do not have the UseLogin option enabled.
     In /etc/ssh/sshd_config, the UseLogin option should either
     be commended out, or should be set to "no".

   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

    5.1 Location of Fixed Packages

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

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

       The corresponding source code package can be found at:

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

   5.2 Verification

       4750b4dc110bcdb9a06f275422486d22 RPMS/openssh-2.9p2-4.i386.rpm
       2ccef9bbd5c51ac9ee3ea7bdb0cad5e8 RPMS/openssh-askpass-2.9p2-4.i386.rpm
       db4931cfa21ef0312ca9f7baaea9d19d RPMS/openssh-server-2.9p2-4.i386.rpm
       50511f127c8215bce46d6082aa924aa9 SRPMS/openssh-2.9p2-4.src.rpm
       

   5.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

         rpm -Fvh openssh-2.9p2-4.i386.rpm \
              openssh-askpass-2.9p2-4.i386.rpm \
              openssh-server-2.9p2-4.i386.rpm
         

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.caldera.com/pub/updates/eDesktop/2.4/current/RPMS

       The corresponding source code package can be found at:

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

   6.2 Verification

       67227fa9552a81465786e23b82347b7b RPMS/openssh-2.9p2-4.i386.rpm
       80693bc40f533ed757a2cc3aa7ad2dbc RPMS/openssh-askpass-2.9p2-4.i386.rpm
       3cbd5f69eb010de1dad17c25b85bcc6f RPMS/openssh-server-2.9p2-4.i386.rpm
       50511f127c8215bce46d6082aa924aa9 SRPMS/openssh-2.9p2-4.src.rpm
       

   6.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

         rpm -Fvh openssh-2.9p2-4.i386.rpm \
              openssh-askpass-2.9p2-4.i386.rpm \
              openssh-server-2.9p2-4.i386.rpm
         

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

       2b214778e58a252b5fa6efda93564ec9 RPMS/openssh-2.9p2-4.i386.rpm
       a7cbe46794f3e2ccd9db54844d6500a2 RPMS/openssh-askpass-2.9p2-4.i386.rpm
       eb5f164e76adf62b19d8d7ce8bd4e121 RPMS/openssh-server-2.9p2-4.i386.rpm
       50511f127c8215bce46d6082aa924aa9 SRPMS/openssh-2.9p2-4.src.rpm
       

   7.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

         rpm -Fvh openssh-2.9p2-4.i386.rpm \
              openssh-askpass-2.9p2-4.i386.rpm \
              openssh-server-2.9p2-4.i386.rpm
         

8. OpenLinux 3.1 Workstation

    8.1 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/Workstation/current/RPMS

       The corresponding source code package can be found at:

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

   8.2 Verification

       2b214778e58a252b5fa6efda93564ec9 RPMS/openssh-2.9p2-4.i386.rpm
       a7cbe46794f3e2ccd9db54844d6500a2 RPMS/openssh-askpass-2.9p2-4.i386.rpm
       eb5f164e76adf62b19d8d7ce8bd4e121 RPMS/openssh-server-2.9p2-4.i386.rpm
       50511f127c8215bce46d6082aa924aa9 SRPMS/openssh-2.9p2-4.src.rpm
       

   8.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

         rpm -Fvh openssh-2.9p2-4.i386.rpm \
              openssh-askpass-2.9p2-4.i386.rpm \
              openssh-server-2.9p2-4.i386.rpm
         

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 11153.

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 wishes to thank Markus Friedl of the OpenSSH team for notifying
   vendor-sec.
______________________________________________________________________________
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