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Firm Says Steam URLs Exploitable

Startup vulnerability research and consultancy firm ReVuln says the way Steam handles steam:// protocol URLs leaves users open to having vulnerabilities in Steam and their game exploited, reports Computerworld, who say their request for comment on this was not immediately fulfilled by Valve (thanks Ant). A proof-of-concept trailer shows what they are talking about, and here's a bit:

According to tests performed by the ReVuln researchers, Internet Explorer 9, Google Chrome and Opera display warnings and the full or partial steam:// URLs before passing them to the Steam client for execution. Firefox also requests user confirmation, but doesn't display the URL and provides no warning, while Safari automatically executes steam:// URLs without user confirmation, the researchers said.

"All the browsers that execute external URL handlers directly without warnings and those based on the Mozilla engine (like Firefox and SeaMonkey) are a perfect vector to perform silent Steam Browser Protocol calls," the researchers said. "Additionally for browsers like Internet Explorer and Opera it's still possible to hide the dodgy part of the URL from being shown in the warning message by adding several spaces into the steam:// URL itself."

Aside from tricking users to manually click on rogue steam:// URLs, attackers can use JavaScript code loaded on malicious pages to redirect browsers to such URLs, Luigi Auriemma said Tuesday via email.

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64. Re: Firm Says Steam URLs Exploitable Oct 18, 2012, 15:30 descender
 
So from what I understand here... if you have a properly secured browser in the first place, this won't be an issue because there is no reason for a rogue javascript to be getting anyone at this point.

... and unless Bluenews.com or espn.com start trying to hack the planet, anyone who runs into this vulnerability (again, with an unsecured browser) are completely at fault here?

Good. Looks like more "security problems" I won't have to worry about.

The exploitable vulnerability with computers sit's in front of the keyboard.

It's almost as if there is no reason for any of the larger spyware offenders to spend any time on this... because they would have been better off exploiting the browser in use to launch the steam URL in the first place. Browsers that are on many more computers than steam clients.


The "quick uninstall steam" crowd here is hilarious. How about "quick, don't click on stupid shit anyway, regardless of if its steam or some other program on your computer being exploited".
 
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