August 7, 2001

Caldera: Security advisory for squid

Author: JT Smith

There is a security problem with Squid, a proxy server shipped as part
of OpenLinux 3.1 Server. If Squid is configured for accelerator mode
(setting http_accel_with_proxy off), any request to Squid is allowed.
Malicious users may use your proxy to portscan remote systems, forge
email, and other activities.


____________________________________________________________________________
                   Caldera International, Inc.  Security Advisory

Subject:                Linux - Squid configuration problems
Advisory number:        CSSA-2001-029.0
Issue date:             2001, August 06
Cross reference:
____________________________________________________________________________


1. Problem Description

   There is a security problem with Squid, a proxy server shipped as part
   of OpenLinux 3.1 Server. If Squid is configured for accelerator mode
   (setting http_accel_with_proxy off), any request to Squid is allowed.
   Malicious users may use your proxy to portscan remote systems, forge
   email, and other activities.


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      
                                 squid-2.4.STABLE/1-7           
   
   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

       1779083edd38872f2ac15c219131d1ba  RPMS/squid-2.4.STABLE1-7.i386.rpm
       e5020ebf7aef60878139cdac81737212  SRPMS/squid-2.4.STABLE1-7.src.rpm
       

   7.3 Installing Fixed Packages

       Upgrade the affected packages with the following commands:

         rpm -Fvh squid-2.4.STABLE1-7.i386.rpm
         

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 10294.

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.

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