More Firefox URI handling security hiccups

Summary:According to Billy Rios and Nate McFeters, the two security researchers behind the exposure of protocol abuse in popular Web browsers, Firefox is still vulnerable to a remote command injection flaw that could allow hackers to launch executable code on Windows machines.

Mozilla has not quite fixed the security hiccups with URI protocol handling in Firefox.

According to Billy Rios and Nate McFeters, the two security researchers behind the exposure of protocol abuse in popular Web browsers, Firefox is still vulnerable to a remote command injection flaw that could allow hackers to launch executable code on Windows machines.

[ SEE: Mozilla fixes its end of URL protocol handling saga ]

Rios explains:

Nate and I have discovered a way to "...exploit a common handler with a single unexpected URI..." Once again, these URI payloads can be passed by the mailto, nntp, news, and snews URIs, allowing us to pass the payload without any user interaction. So, it seems that although the conditions which allowed for remote command execution in Firefox 2.0.0.5 have been addressed with a security patch, the underlying file type handling issues which are truly the heart of the issue have NOT been addressed.

Rios said Mozilla was contacted "a while ago" about this issue and has promised a more comprehensive patch.

More on the URL Protocol Handling vulnerability saga:

Command injection flaw found in IE: Or is it Firefox?

Microsoft should block that IE-to-Firefox attack vector

Mozilla caught napping on URL protocol handling flaw

Protocol abuse adds to Firefox, Windows security woes

Topics: Security, Browser

About

Ryan Naraine is a journalist and social media enthusiast specializing in Internet and computer security issues. He is currently security evangelist at Kaspersky Lab, an anti-malware company with operations around the globe. He is taking a leadership role in developing the company's online community initiative around secure content managem... Full Bio

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