Security Basics mailing list archives
Re: Are Proxy Firewalls a Security Hole?
From: Stephanus J Alex Taidri <securityfocus.ae () taidri com>
Date: Fri, 1 Jun 2012 14:43:14 +0800
Dav, The 68 chars of EICAR virus-test signature must not be combined with any other larger test file. It may optionally be appended by any combination of whitespace characters (not exceeding 128 chars in length) and use only allowed whitespace chars such as: space character, tab, LF, CR, CTRL-Z. The reason why most proxy firewall do not perform deep inspection for larger file (more than X MB of size) because commonly virus (or dropper) will have much smaller size to infect the victim effectively. It may later download the real payload of virus once successfully exploit the victim host and stay persistent. Kind regards, SJ Alex Taidri On Fri, Jun 1, 2012 at 6:54 AM, Dav Fisher <dfisher3202 () gmail com> wrote:
Given that people are sending larger and larger files, proxy firewalls seem to be limited since they can't inspect files after a certain point and the 'stream', 'flow', 'express' AV options of many of the proxy firewall vendors inspect only a portion of the large file. I've been able to put the Eicar virus in different locations of a large test file and successfully get the file through the firewall. So, are proxy firewalls a security hole?
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Current thread:
- RE: Are Proxy Firewalls a Security Hole? Dan Lynch (Jun 01)
- <Possible follow-ups>
- Re: Are Proxy Firewalls a Security Hole? Rob (Jun 01)
- Re: Are Proxy Firewalls a Security Hole? Stephanus J Alex Taidri (Jun 01)
- Re: Are Proxy Firewalls a Security Hole? Dav Fisher (Jun 04)
- RE: Are Proxy Firewalls a Security Hole? David Harley (Jun 01)
- Re: Are Proxy Firewalls a Security Hole? Kurt Buff (Jun 01)