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Author Topic: A security bug in headless client?  (Read 1361 times)
d1337r
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July 16, 2010, 10:51:28 AM
 #1

(not found by me, but by linux.org.ru user mkfifo)

If you start bitcoind as one user, then type some command as the other user (e.g. bitcoind getbalance), it will work and output your balance. It may be very dangerous on multi-user systems. Imagine there is a user with a hard password that owns bitcoin wallet and a user with weak password that doesn't. So if a hacker breaks the other user's password or gets access to the other user's account, he could steal the money from the first user.

Some desktops (Windows and Linux) even have the guest account with no password, that can be used to steal bitcoins too.

The solution would be to open a UNIX socket with read/write permissions only for the user/group it is opened as.

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There are several different types of Bitcoin clients. Header-only clients like MultiBit trust that the majority of mining power is honest for the purposes of enforcing network rules such as the 21 million BTC limit. Full clients do not trust miners in this way.
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mkfifo
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July 16, 2010, 12:00:27 PM
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i make topic: http://bitcointalk.org/index.php?topic=410.0

thank d1337r! :-)
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