If you downloaded and installed the open-source Unreal IRC server in the last 8 months or so, you’ve been pwned. Here’s the official announcement:

Hi all,

This is very embarrassing…

We found out that the Unreal3.2.8.1.tar.gz file on our mirrors has been replaced quite a while ago with a version with a backdoor (trojan) in it.

This backdoor allows a person to execute ANY command with the privileges of the user running the ircd. The backdoor can be executed regardless of any user restrictions (so even if you have passworded server or hub that doesn’t allow any users in).

It appears the replacement of the .tar.gz occurred in November 2009 (at least on some mirrors). It seems nobody noticed it until now.

Right. Becauseeven server administrators believe that open source and Linux software are impregnable by design, the official download of a widely distributed server product has been infected with a backdoor that gives bad guys complete ownership of the system. Oops.

The Windows (SSL and non-ssl) versions are NOT affected.
Details: Linux infection proves Windows malware monopoly is over | ZDNet