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             AUSCERT External Security Bulletin Redistribution

                         ESB-2008.0355 -- [Linux]
                 Webwasher Denial of Service Vulnerability
                               16 April 2008


        AusCERT Security Bulletin Summary

Product:              Secure Computing WebWasher 6.6.3 build 3102 and older
Publisher:            Secure Computing
Operating System:     Linux variants
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-1797

Original Bulletin:    https://extranet.webwasher.com/download/csm/index.html

Revision History:     April 16 2008: Added CVE reference
                      April  7 2008: Initial Release

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Credit:	The disclosure of this issue has been credited to National Australia
Bank Security Assurance. 

Secure Computing Webwasher  6.6.3 build 3102 and older versions running on
CGLinux 4/5, RHEL 4, Debian 4, SLES10

Not vulnerable: 
Secure Computing Webwasher Builds 3150 and newer (all platforms)

Webwasher (all versions) for Windows
Webwasher (all versions) for Solaris
Webwasher (all versions) for some Linux (RHEL 3, SLES8, SLES9, Debian 3)
Webwasher 5.3 appliances (running CGLinux 3.x)


Due to a change in the behavior of newer Linux systems, we have become aware
that a Denial of Service attack can be launched against Webwasher running on
Linux based operating systems which will freeze the Webwasher service.  If
this happens, Webwasher becomes unable to handle any request until the
Webwasher service is restarted.

The attack can be initiated by an internal user sending a specially crafted
URL to Webwasher. It could also be exploited by an external attacker by
redirecting proxy users to the exploit URL. 

Who is affected?
Users of all Webwasher appliances version 6.x (CGLinux 4 or 5):
  - If not running current version of Webwasher software but build numbers
    prior to 3150
Users of Webwasher software versions
  - If running on RedHat Enterprise Linux 4, Debian Linux 4 or Linux Suse
    Linue 10
  - And if not running current version of Webwasher software but build
    numbers prior to 3150

Who is not affected?
  - All Webwasher installations on current versions - build numbers
    3150 or newer 
  - Webwasher Software customers on Windows, Solaris, Linux RedHat
    Enterprise 3, Linux Suse 8 and 9, Debian 3.1 and Webwasher appliances
    running with CGLinux 3.x are not affected.   

A special handcrafted URL has to be sent to Webwasher on the affected Linux
systems which will then freeze the application.
National Australia Bank Security Assurance has provided an undisclosed
proof of concept.


The vendor has released Webwasher versions to address this:
  - Webwasher 6.6.3 build 3150
  - Webwasher 5.3.0 build 3159
Both are available at: https://extranet.webwasher.com/download/csm/index.html
Webwasher appliances can be upgraded automatically via the GUI

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If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

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