His bug report explained that there are hundreds of internal privileged LastPass RPC commands, but LastPass users wouldn’t want bad actors accessing RPCs which would allow passwords to be copied. “There are a lot of RPCs, allowing complete control of the LastPass extension, including stealing passwords,” Ormandy wrote. He developed a working exploit for a Windows box running the LastPass Chrome extension, but said it “could be made to work on other platforms.” He sent the details to LastPass before adding:įull exploit is two lines of javascript.
Ormandy originally said the LastPass bug affected 4.1.42 Chrome and Firefox browser extensions. LastPass said it patched the vulnerability in its Chrome extension and said it is working on a fix for the flaw in its Firefox add-on. Tavis Ormandy, a security researcher on Google’s Project Zero team, warned of flaws in LastPass browser extensions, vulnerabilities which – if a person surfed to a malicious site – would allow the malicious site to steal passwords from the password manager.
