Hi all, One of our webservers seems to get compromised on a daily basis. When I do a ps ax I see these processes all the time.
18687 ? S 0:00 shell 18701 ? Z 0:00 [sh <defunct>] 18704 ? T 0:00 ./3 200.177.162.185 1524 18705 ? Z 0:00 [3 <defunct>] And if I check the /tmp dir there are strange executable files in there that are owned by www-data. Such as ./3 and others like ./bdshell. Definitely some sort of Trojan. When I did a virus check first time it showed that it was infected with the old Linux.RST virus, it basically stuffed the entire /bin directory. I did a rebuild, virus checked all client files on a different server, then copied them back. After a week, same thing. Infected. /tmp/sl# ls -al total 452 drwxr-xr-x 2 www-data www-data 4096 Jun 1 09:32 . drwxrwxrwt 3 root root 4096 Jun 1 09:37 .. -rwsrwsrwt 1 www-data www-data 446714 May 29 05:12 ps.htm I'm pretty sure it's one of our clients who has some dodgy php-nuke sites or something like that. All our other webservers are fine running the same build. But this server is the major client one where we allow them to FTP and make MYSQL changes. I'd appreciate some help on how to stop this from happening. Running Debian Stable with all the security updates. P.S. Sorry for the Disclaimer, company policy, which I don't agree with, yet they pay me so I must comply :/ -- Ross. DISCLAIMER: This e-mail and any files transmitted with it may be privileged and confidential, and are intended only for the use of the intended recipient. If you are not the intended recipient or responsible for delivering this e-mail to the intended recipient, any use, dissemination, forwarding, printing or copying of this e-mail and any attachments is strictly prohibited. If you have received this e-mail in error, please REPLY TO the SENDER to advise the error AND then DELETE the e-mail from your system. Any views expressed in this e-mail and any files transmitted with it are those of the individual sender, except where the sender specifically states them to be the views of our organisation. Our organisation does not represent or warrant that the attached files are free from computer viruses or other defects. The user assumes all responsibility for any loss or damage resulting directly or indirectly from the use of the attached files. In any event, the liability to our organisation is limited to either the resupply of the attached files or the cost of having the attached files resupplied.
