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Arrow  Topic :

8e6 Technologies R3000 Internet Filter Bypass by Request Split


Arrow  SecurityAlert : 3557
Arrow  CVE : CVE-2008-0372
Arrow  SecurityRisk : Low  Security Risk Low  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Exploit Available : No
Arrow  Credit : nnposter
Arrow  Published : 22.01.2008

Arrow  Affected Software : 8e6 Technologies R3000 Internet Filter



Arrow  Advisory Content :  

8e6 Technologies R3000 Internet Filter Bypass by Request Split

Product:

8e6 Technologies R3000 Internet Filter

http://www.8e6.com/network-security/internet-filtering/internet-filterin
g.html

The HTTP URL filtering function provided by the 8e6 Technologies R3000
Internet Filter can be bypassed by simply splitting the HTTP request line
(which contains the URI) into multiple packets.

Example:

packet 1: GE

packet 2: T / HTTP/1.0rn

This weakness is present regardless whether the site block is based on the
DNS name or the IP address. For circumventing blocks based solely on the
DNS name it is sufficient to arrange the HTTP request so that the request
line and the Host header end up in separate packets.

Example:

packet 1: GET / HTTP/1.0

X-SomeHeader: ...

....

packet 2: X-SomeOtherHeader: ....

Host: www.blocked.com

...

The vulnerability has been identified in version 2.0.05.33. However, other
versions may be also affected.

Solution:

Use a filtering solution that performs an HTTP request reassembly.

Found by:

nnposter






Arrow  Feedback :

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