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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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39. You are wrong again. Oct 17, 2012, 20:26 hb3d
 
hb3d wrote on Oct 17, 2012, 19:41:
Glad to see you're good on the fear mongering 101 though.
It's not fear mongering. It is the truth. This exploit can allow remote code execution, and since it can, there is virtually no limit to what it can do.

Steam url's aren't scripted.
They can be. A website can script the URL's to execute in the browser without clicking on anything, i.e. redirection.

See "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."

I have followed Luigi's work in game hacking for over ten years. He has reported the vulnerabilities he finds in games to companies like Epic and id for years, and they have been subsequently fixed. When he says something about games and exploits, it is the truth.

Even someone from h-online figured that one out. "disabling the steam:// handler will disable or severely limit this vulnerability."
I said the same thing below. The problem is that Steam will restore that functionality when it launches or automatically updates.

This comment was edited on Oct 17, 2012, 21:02.
 
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