dcsimg
Linux Today: Linux News On Internet Time.





More on LinuxToday


Caldera Security Update: Remote vulnerability in OpenSSH

Dec 13, 2001, 20:10 (0 Talkback[s])
From:   Support Info 
Subject:        Security Update [CSSA-2001-042.0] Linux - Remote vulnerability in OpenSSH
Date:   13 Dec 2001 12:08:48 -0700      

____________________________________________________________________________
                   Caldera International, Inc.  Security Advisory

Subject:                Linux - Remote vulnerability in OpenSSH
Advisory number:        CSSA-2001-042.0
Issue date:             2001, December 11
Cross reference:
____________________________________________________________________________


1. Problem Description

   The OpenSSH team has reported a vulnerability in the OpenSSH server
   that allows remote attackers 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.

   Exploits of this vulnerability have apparently been circulated for
   some time.


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 -Fvhopenssh-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.