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Re: [Full-disclosure] SEC-Consult SA 20051025-0 :: Snoopy Remote Code Execution Vulnerability
From: SEC Consult Research (researchsec-consult.com)
Date: Thu Oct 27 2005 - 09:14:52 CDT
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.
SEC Consult Unternehmensberatung GmbH
Tel.: +43 / 1 / 409 0307 - 570
Fax.: +43 / 1 / 409 0307 - 590
Mail: office at sec-consult dot com
EOF Daniel Fabian / 2005
d.fabian at sec-consult dot com