[horde] Security problem

[Charrua]

Hi,

I have security problem. Somebody hacked my web server and save this files in /tmp directory:

cb.pl
udp.pl

I checked the logs, and realy don't find any information about how they save this files. I don`t know where is the security hole.

I think which the problems is with the directory and file permissions, but I'm not sure.

Can you help me to find the problem?

Thanks Andrés
Sorry for my bad English

The software instaled are:

apache 1.3.34
php 4.4.2
IMP-H3 4.1.1
Pear 1.4.6