bugtraq - Re: SEC-Consult SA 20051025-0 :: Snoopy Remote Code Execution Vulnerability

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Message-ID: <5216.83.65.90.98.1130422492.squirrel@www.sec-consult.com>
Date: Thu, 27 Oct 2005 16:14:52 +0200 (CEST)
From: "SEC Consult Research" <research@...-consult.com>
To: "Florian Weimer" <fw@...eb.enyo.de>
Cc: Full Disclosure <full-disclosure@...ts.grok.org.uk>,
	bugtraq@...urityfocus.com
Subject: Re: SEC-Consult SA 20051025-0 :: Snoopy Remote 
	Code Execution Vulnerability

On Thu, October 27, 2005 10:12 am, Florian Weimer said:
> Have you considered in your analysis that malicious servers might
> return HTTP redirects which contain suitable URLs?  This requires that
> the offsiteok member is set to true, though, because in the version I
> looked at, only http:// URLs are considered site-local.

Yes, I can confirm this. While I have not thought of this possibility, it
seems to boost the risk coming from the vulnerability.

I found the flaw during a review of Wordpress which uses MagpieRSS which
in turn uses Snoopy. As MagpieRSS is widly used, the concequence is that
any RSS feed-provider can replace the feed with a small redirect script,
exploiting the flaw with a crafted redirect https URL. Doing this with a
highly frequented RSS feed might result in many many servers being
simultaniously compromized. I might add that the offsiteok member defaults
to true and MagpieRSS does not seem to change that default value.

A notice to MagpieRSS has already been sent.

Daniel

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SEC Consult Unternehmensberatung GmbH

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EOF Daniel Fabian / @2005
d.fabian at sec-consult dot com

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