A serious flaw in how Firefox handles log-ons could be used by identity thieves to dupe users into disclosing passwords, a noted security researcher said Wednesday.
Aviv Raff, an Israeli researcher best known for ferreting out browser flaws, revealed the Firefox spoofing vulnerability on his personal blog, and posted a demonstration video there. He did not go public with any proof-of-concept code or working exploit, however.
According to Raff, Firefox 188.8.131.52 -- Mozilla Corp.'s most current version -- fails to sanitize single quotation marks and spaces in what's called the "Realm" value of an authentication header. "This makes it possible for an attacker to create a specially crafted Realm value which will look as if the authentication dialog came from a trusted site," said Raff.
Raff outlined a pair of possible attack vectors. One would rely on a malicious site that included a link to a trusted site -- a well-known bank, say, or a Web e-mail service such as Gmail or Hotmail -- that when clicked would display its usual log-on dialog. In the background, however, the attacker would have crafted a script that exploited the Firefox vulnerability to redirect the username and password entered by the user to the hacker's server instead of the real deal
FF is still at 184.108.40.206 though. Hope they don't take their time like Micro$oft.