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Re:LastPass users warned their master passwords are compromised by Schiendelman on Wednesday December 29, 2021 @03:33PM (#29729639)
Given these experiences, especially the same message after changing the password, makes me think that LastPass’ message is wrong - that it claims someone used your password, but the attacker is not actually doing so.

This would explain all the data I’ve seen so far, including LastPass’ reaction.

Speculation: LastPass might use this message even if someone tries an old password? Does that fit the data so far?

Re:LastPass users warned their master passwords are compromised by gregsadetsky on Wednesday December 29, 2021 @03:56PM (#29729922)
That's an interesting new avenue -- that older passwords are/were recognized too.

I just tried my old password and the error message only says to check the password -- there are no emails sent saying that someone attempted to log into my account with my password.

LastPass did change their systems, supposedly correcting for the issue that we all saw. So the test I just did also isn't really indicative of how their systems were working 2 days ago.

There are still remaining questions:

- the use of "some" and "likely" in LastPass' new announcement -- https://www.bleepingcomputer.com/news/security/lastpass-user...

- an explanation on how the false positives happened. What made the system think those attempts were using the correct master passwords?

- an assurance that no correct master passwords were used during the attack -- that they were all false positives (i.e. this attack was strictly credentials stuffing i.e. someone tried a bunch of passwords they obtained from other sources)

- finally, an explanation for the 3 independent cases where people changed their passwords and then received an email again saying someone had attempted to login using their passwords. Those emails may have been false positives as well, but we would have to know.

Re:LastPass users warned their master passwords are compromised by Schiendelman on Thursday December 30, 2021 @01:47PM (#29739883)
Great point that we have no idea how to verify anything now since they changed their systems.

I switched to using icloud keychain a while back, after a breach LastPass had a few years ago.