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AUSCERT External Security Bulletin Redistribution
ESB-2008.0355 -- [Linux]
Webwasher Denial of Service Vulnerability
16 April 2008
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AusCERT Security Bulletin Summary
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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.
Vulnerable:
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)
DISCUSSION
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.
EXPLOIT
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.
SOLUTION
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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This security bulletin is provided as a service to AusCERT's members. As
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If you believe that your computer system has been compromised or attacked in
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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