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from the catpturing-the-keys-to-your-kingdom dept.
LastPass patched three separate bugs that affected its Chrome and Firefox browser extensions, which if exploited, would have allowed a third-party to extract passwords from users visiting a malicious website.
All bugs were discovered by Tavis Ormandy, a security researcher working for Google's Project Zero.
One bug affected the LastPass for Chrome extension, while the other two affected the company's Firefox add-on.
The vulnerability affecting the LastPass Chrome extension can be exploited by attacking an intermediary JS script that stands between the user's browser and the LastPass cloud service, where the company stores user passwords.
"It's possible to proxy untrusted messages to LastPass 4.1.42 due to a bug, allowing websites to access internal privileged RPCs (Remote Procedure Calls). " Ormandy explained. "There are a lot of RPCs, allowing complete control of the LastPass extension, including stealing passwords. If you have the 'Binary Component' installed, this even allows arbitrary code execution."
The second and third bugs Ormandy discovered affect the LastPass Firefox add-on version 3.3.2 only. LastPass told Ormandy that version 3.3.2 is their most popular version.
Despite this, two weeks ago, LastPass announced they were retiring the LastPass Firefox add-on v3.3.2 because of Firefox's future plans to drop the old Add-ons API and move to a new system they call WebExtensions. The LastPass Chrome and Firefox extensions don't use the same version numbers, and the v3 on Firefox is the stable branch.
Just like the Chrome extension issue, the exploitation vector for these two issues is malicious JavaScript code that can be hidden in any online website, owned by the attacker or via a compromised legitimate site.
Source: BleepingComputer
(Score: 0) by Anonymous Coward on Sunday March 26 2017, @07:15AM
Given his job, It's probably Schneider, he introduced a misspelling to affect identity stealing attacks. :^)