Debian Security Advisory 1873-1 - Juan Pablo Lopez Yacubian discovered that incorrect handling of invalid URLs could be used for spoofing the location bar and the SSL certificate status of a web page.
356bf7c18df73523e6398c09fcd86214240a2f6d1b8b04047695a2254b6e4857Mandriva Linux Security Advisory 2009-198 - Security researcher Juan Pablo Lopez Yacubian reported that an attacker could call window.open() on an invalid URL which looks similar to a legitimate URL and then use document.write() to place content within the new document, appearing to have come from the spoofed location. Moxie Marlinspike reported a heap overflow vulnerability in the code that handles regular expressions in certificate names. This vulnerability could be used to compromise the browser and run arbitrary code by presenting a specially crafted certificate to the client. IOActive security researcher Dan Kaminsky reported a mismatch in the treatment of domain names in SSL certificates between SSL clients and the Certificate Authorities (CA) which issue server certificates. These certificates could be used to intercept and potentially alter encrypted communication between the client and a server such as sensitive bank account transactions. This update provides the latest Mozilla Firefox 3.0.x to correct these issues. Additionally, some packages which require so, have been rebuilt and are being provided as updates.
75f839274f8e82729d0a4c1aca579dbfb860f6c2f1f69f8353c4f57860a78bd7Ubuntu Security Notice USN-811-1 - Juan Pablo Lopez Yacubian discovered that Firefox did not properly display invalid URLs. If a user were tricked into accessing a malicious website, an attacker could exploit this to spoof the location bar, such as in a phishing attack. Furthermore, if the malicious website had a valid SSL certificate, Firefox would display the spoofed page as trusted.
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