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From Joe Orton <>
Subject Re: post-CVE-2011-4317 (rewrite proxy unintended interpolation) rewrite PR's
Date Thu, 07 Jun 2012 15:55:10 GMT
On Wed, Jun 06, 2012 at 09:08:02PM -0400, Jeff Trawick wrote:
> Here are some valid requests which fail the 4317 checks:
> CONNECT[:port]
> GET proxy:    (rewriting something which was
> already proxied internally)
> I am leaning towards the likely minority view that it is problematic
> to not know what the valid inputs to a ~15 year old module really are,
> and we should whitelist a few more patterns such as those above and
> see how far it gets us.  Unfortunately this breaks a few users but
> they are holding the testcases.

Some thoughts:

1) FUD: if we start relaxing those checks again something else is going 
to break in an unexpected way.

2) mod_rewrite's behaviour should match mod_rewrite's documentation.  If 
mod_rewrite guarantees that the input to the first rule set (in vhost 
contex) is a URL-path, it shouldn't arbitrarily ignore that guarantee 
for "special" URIs.

I like Eric's suggestion of an opt-in RewriteOption.  This will avoid 
having to iterate yet again if the whitelist is either too broad or too 
narrow, and can make the security implications (such as they are) 

Regards, Joe

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