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bug#37344: rcirc: nil gets interpreted as a nickname
From: |
Naïm Favier |
Subject: |
bug#37344: rcirc: nil gets interpreted as a nickname |
Date: |
Sun, 8 Sep 2019 20:58:59 +0200 |
Severity: normal
Ever since I changed my nickname to "nil" on Freenode, I've been
getting occasional private messages from unknown users consisting of a
single empty CTCP ACTION. After a bit of investigating, it turned out
they all used rcirc. The situation was clear at that point: somewhere
in rcirc's source code, a nil value is being implicitly converted to a
string and used as the target of a PRIVMSG command.
The bug seems to be reproducible by issuing "/me" (without arguments)
inside a server buffer: the "nil" user on that server gets sent an
empty ACTION.
Suggested fix: in rcirc-send-privmsg, fail if target is nil. It might
be useful to check other places where the "%s" format is used, to
discover similar bugs.
- bug#37344: rcirc: nil gets interpreted as a nickname,
Naïm Favier <=