PoC for Facebook Worm: A Polish security researcher today published a PoC that could be used to create a fully functional Facebook worm.
The code exploits a security gap on the Facebook platform. The investigator using the Lasq alias discovered the vulnerability when he noticed that spammers used it on Facebook.
The vulnerability is in the mobile application version. The computer version is unaffected.
Lasq reports that vulnerability allows clickjacking and that an attacker can exploit it through iframes.
Yesterday I noticed a very annoying SPAM campaign on Facebook where many of my friends were posting a link to a site hosted on an AWS bucket. There was also someone link to a French site with funny comics.
Once you clicked on the link, the page hosted on the AWS bucket was displayed, asking you to verify that you are 16 years old or older (in French) to access the content. Once you clicked the button, your page was promoted to a funny comic (and many ads) page. However, in the meantime the same link you just pressed automatically posted on your Facebook wall.
The researcher tracked the issue and noticed that it was completely ignoring the “X-Frame-Options” security header. This header is used by websites to prevent page code from loading through iframes and is a primary defense against attacks clickjacking.
Lasq said he reported the problem to Facebook, but the company refused to fix it. So he decided to publish the PoC.
Lasq's code doesn't include the clickjacking part, the one that posts content to victims' walls, but if you're interested and want to find it it's online with a simple search. Lasq's code only allows an attacker to load and execute unauthorized code on a account Facebook user.
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