Nevertheless, in the bug report, Ormandy said LastPass initially told him that “they couldn't get my exploit to work, but I checked my Apache access logs and they were using a Mac. It doesn’t seem like rocket science to grasp that Windows Calculator will only run on Windows. If you are running a vulnerable LastPass browser extension version, then Ormandy’s proof-of-concept demonstration will run Windows Calculator. If “Binary Component” is installed – it is on by default in Firefox and Internet Explorer – then Ormandy said, “This even allows arbitrary code execution.” In case you don’t know, remote code execution (RCE) is a critical vulnerability and as bad as a flaw gets you could think of it like the devil – unless of course you are a bad guy wanting to remotely control your target’s computer and then it would be your friend. 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.
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