The first vulnerability has apparently not been addressed yet, which Ormandy mentions may be the result of Mozilla needing time to review the updated extension before pushing it to users. Based on his tweet, it could reveal a user's password, but not all of the details have been revealed yet.

The second issue could be more serious, with the ability to steal a user's passwords or, if the binary version of the extension is installed, run any code the attacker tells it to (in an example, Ormandy causes the target's computer to open a Calculator program.) According to LastPass the issue has been resolved, although a promised follow-up blog post with more details has yet to appear.

There's even less info available about the latest vulnerability identified, although the version number (4.1.35) matches a LastPass changelog note for its most recent Internet Explorer add-on. 

 

[via]