Server Hacked - What Preventative Measures To Use
Jan 26, 2008
I am renting a cheap Linux server merely to test and learn as much as possible.
The server itself is completely unsecured, as I am doing everything one at a time to learn as much as possible.
Now, a few days ago I noticed someone with a US based IP had logged into my root account. The bash log mentioned something about some network commands and I traced the IPs to my server datacenter, so no big deal I thought, but I changed the root password anyways.
Today it happened again, but this time the bash log was cleared, and in my /var/www/html folder I found a suspicious folder with eBaywhateverapi.dll in it. I deleted it, seeing as this was not normal, which led me to the conclusion my server was hacked. Since it's a cheap test server, it's no loss at all, I'm just glad it's not the server I use for my customers!
So, what I did now was this:
Removed all suspicious folders in /home
Turned off root login (made a new account which I use to su into root)
Changed the SSH port
Changed root password
Will this be enough for now, or should I do anything else?
I'm running CentOS 4
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Jan 20, 2008
Currently configuring my VPS, have been for a while now, and am relooking at the security I'll need on it. The VPS will be running something similar to a CMS/Forum site and won't be offering webhosting. Alot of the security measures around here are webhosting orientated. What security procedures does everyone suggest for my situation?
I've got APF, BFD and restricted root SSH access. Is there anything else?
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Jul 24, 2009
I hope all are fine and doing good, can somebody provide detail guide line how to test Penetration testing on linux servers and what security measures are required in against of that.
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Sep 30, 2009
Over the past number of years there has been an obvious increase in credit card fraud and identity theft.
Our policies have always tried to stay a step ahead but it seems no matter what is done the occasional fraudster manages to squeeze through, costing us a lot of money. At one some point in early 2009, it got as bad as 60% of the orders we received. It ended up eating a LOT of our time just to go through each order and verify them as best we could.
What methods do you use to fight fraud?
I'll start with some of the things we do.
- Require CVV code on the credit card
- We call the customer's telephone number and verify with them. - Verify the telephone number matches the region of the address they provide
- Require the CC issuing Bank's name and number
- We often require the customer to fax a signed credit card authorization form
- GeoIP matches location of the address in the order
Obviously the big challenge is proving that the person placing the order is the actual owner of the card. I've received the correct CVV, spoken with the customer on the phone number, had the phone number match the region... non-US so I wasn't able to verify their telephone details with the issuing bank. Had the GeoIP match and still found out it was fraud.
On a side note: Am I the only one that feels banks and those issuing credit cards need to take more responsibility for a system that's clearly broken? Even after going through the process above, it can still be fraud with a chargeback issued. In those cases, the company loses the money they made, pay a fee to the payment provider, lost time for Sales Reps and Tech Reps, and of course they lose money on hardware, electricity and bandwidth.
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Mar 17, 2007
SOme one has claimed that he has penetrated my server and has gathered some kind of information via shell access, I have disabled the possible ways of shell access for the users via twaek settings, and php.ini
- How I can check he has made any backdoor for himself or not?
and I have made a trojan check via Scan for Trojan Horses in WHM, and it has found about 200 possible trojans.
- How I can remove them?
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May 18, 2009
217.67.250.41 - - [18/May/2009:15:36:08 +0100] "GET /w00tw00t.at.ISC.SANS.DFind HTTP/1.1" 400 226 "-" "-"
What is mean ? Sorry for ask a fast answer. I have change my domain's IP to protect someone can run dangerous script...
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Dec 21, 2006
My dedicated server was rather slow. Upon checking, I had a new cron job, (deleted now) made by apache, pinting to the following IRC bot.
[root@server50040 tmp]# cd .LiveZone/
[root@server50040 .LiveZone]# ls -al
total 384
drwxr-xr-x 10 apache apache 4096 Dec 21 12:17 .
drwxrwxrwt 3 root root 4096 Dec 21 12:15 ..
-rwxr-xr-x 1 apache apache 320 Dec 9 2004 config
-rw------- 1 apache apache 1002 Dec 9 2004 config.h
-rw-rw-r-- 1 apache apache 55 Dec 20 22:55 cron.d
-rwxr-xr-x 1 apache apache 347 Dec 9 2004 ****
drwxr-xr-x 2 apache apache 12288 May 31 2002 help
-rwxr-xr-x 1 apache apache 210216 Dec 9 2004 httpd
drwxr-xr-x 2 apache apache 4096 Jan 12 2002 lang
-rw------- 1 apache apache 492 Dec 21 12:17 livezone
-rw-rw-r-- 1 apache apache 19 Dec 20 22:55 livezone.dir
-rw------- 1 apache apache 492 Dec 21 12:09 livezone.old
drwxr-xr-x 2 apache apache 4096 Dec 21 12:10 log
-rw-r--r-- 1 apache apache 2137 Sep 26 2003 Makefile
-rw-r--r-- 1 apache apache 731 Dec 9 2004 makefile.out
-rwxr-xr-x 1 apache apache 15090 Dec 9 2004 makesalt
drwxr-xr-x 3 apache apache 4096 Jul 30 2000 menuconf
drwxr-xr-x 2 apache apache 4096 Jul 17 2000 motd
-rwxr-xr-x 1 apache apache 14306 Nov 13 2003 proc
-rw------- 1 apache apache 6 Dec 21 12:10 psybnc.pid
-rw-r--r-- 1 apache apache 10780 Dec 9 2004 README
-rwxr-xr-x 1 apache apache 68 Jun 4 2004 run
drwxr-xr-x 2 apache apache 4096 Dec 9 2004 scripts
drwxr-xr-x 2 apache apache 4096 Dec 9 2004 src
-rw------- 1 apache apache 3901 Jan 12 2002 targets.mak
drwxr-xr-x 2 apache apache 4096 Dec 9 2004 tools
-rwxr--r-- 1 apache apache 21516 Sep 25 2002 xh
-rwxrw-r-- 1 apache apache 194 Dec 20 22:55 y2kupdate
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Apr 7, 2007
My server was hacked some time ago. I've changed passwords and scanned system for viruses, but found nothing.
Now, I'm looking into the log file /var/log/messages and I have few questions:
1. There are a lot of messages like: Apr 2 02:53:09 host
sshd(pam_unix)[29398]: authentication failure; logname= uid=0 euid=0 tty=ssh
ruser= rhost=203.196.151.235
Do these messages mean that hacker trying to enter the server under root?
2. There are messages like these:
Apr 2 03:56:10 host clamd[4678]: stream 1255: Worm.SomeFool.P.2 FOUND
Apr 2 10:46:10 host clamd[4678]: stream 2008: Worm.Bagle.pwd-eml FOUND
What does this mean? Virus on my server or something else?
3. Also, I can see a lot of messages like this one:
Apr 2 09:38:40 host clamd[4678]: stream 1111: Email.Phishing.RB-524 FOUND
Does someone read my emails?
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Nov 17, 2006
My server just got hacked i just bought it!!
and they was going to charge me anouther $35 to reset the password how stupid...
in the end we got it done free
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Oct 29, 2009
My server was hacked night before last and here is the log
Oct 28 10:30:47 server1 [19705]: connection from "173.45.118.58"
Oct 28 10:30:47 server1 [19705]: User root's local password accepted.
Oct 28 10:30:47 server1 [19705]: Password authentication for user root accepted.
Oct 28 10:30:47 server1 [19705]: User root, coming from 3a.76.2d.[url], authenticated.
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Jan 10, 2008
I found a process /usr/sbin/httpd was running by nobody, then I did a trace in WHM and found this. Is my server hacked ?
send(4, "@206113irc10quakenet3org1"..., 34, MSG_NOSIGNAL) = 34
poll([{fd=4, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(4, FIONREAD, [162]) = 0
recvfrom(4, "@2062012001103irc10quakenet3org1"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("72.36.191.2")}, [16]) = 162
close(4) = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 4
ioctl(4, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbffb3718) = -1 EINVAL (Invalid argument)
_llseek(4, 0, 0xbffb3770, SEEK_CUR) = -1 ESPIPE (Illegal seek)
ioctl(4, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbffb3718) = -1 EINVAL (Invalid argument)
_llseek(4, 0, 0xbffb3770, SEEK_CUR) = -1 ESPIPE (Illegal seek)
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
connect(4, {sa_family=AF_INET, sin_port=htons(6665), sin_addr=inet_addr("83.140.172.210")}, 16) = -1 ETIMEDOUT (Connection timed out)
close(4) = 0
open("/etc/protocols", O_RDONLY) = 4
fcntl64(4, F_GETFD) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
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May 14, 2008
My websites worked very well some days ago. I've touched nothing on my server since then and now every website I have on it is down!
I have a VPS and have root access.
When I restart my apache web server, my websites are working for about 3 seconds! Then it doesn't work any longer!
I've talked to my host but they may find the error if their technicians look at my server but this will cost!
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Dec 8, 2008
I have a dedicated server on a web host. I have 3 domains hosted on the same server. One of the domains was apparently hacked and a rogue script was installed that was using the exim service to send out spam. At least that's what I thought was going on.
When I contacted tech support at the web host they confirmed that the emails were being sent through my server and told me that there was no way for them to tell me what script was doing it or where it was located in the domain files. At this point I had them stop the exim service on my server so I knew no more spam would be sent out until I could get this web space cleaned up.
I backed up all of my files and the database from that domain and wiped out every file in the domain space by having the web host delete everything from their end. Then I created a new web space for the domain. I didn't load any programs or files whatsoever. Just the bare minimum to support the domain. Then I created the email accounts.
During this process I made sure that I changed every password on the domain. I didn't even use the same login names except for the email accounts. The email account passwords were also new.
As soon as I had the email accounts turned on there was more spam. What I find curious is that I have several email accounts on this domain but it's only one that all of this spam is being sent through. I don't know enough about the mechanics to know if this really is being sent through my server or if someone is just plugging in my email address in the spam.
I have not done anything with the other two domains on the server. Is it possible that even though these are saying they are from the fresh domain space they could be from a script on one of the others? ..............
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Sep 1, 2007
I have Windows 2003, all security patches, I run Plesk 8.2 and nothing much else. I use MySQL as a database with port 3306 open so I can connect from the outside (password protected also). I do use strong passwords on my Plesk, administrator etc. I use standard microsoft FTP, Windows 2003 Firewall and connect through Plesk or remote connection.
Somebody has been able to penetrate to my Admin remote desktop :-( I found strange windows open when I connected and in the log there was an indication of the printer driver load. The printer name was one I don't have and my Remote connection has Printers off. The attacker although smart did connect with his printer and that was visable in log. When he terminated the session I found his IP.
I have since changed my administrator password but it doesn't help, he was in again today. He didn't do any harm up to now I think, I checked for viruses and Spyware.
I don't know what to do any more. He can do whatever he wants and if I don't know how he is getting access to my admin account I can not stop him. I blocked today with IPSec the whole IP range of his provider, but as he is smart he can hack another computer and connect to me from him (maybe he has already done that and the IP was from a hacked server). This is no solution. I need to patch the hole.
I use ASP scripts but I don't think one can gain access to the whole admin by them, maybe only get access to my database (if I would make a mistake and wouldn't protect for the injections or some other things).
I am desperate. Plese, if anybody has some ideas what can I do, how do I "catch" him, I mean patch the hole, please let me know.
I had an idea to block all IP's to port 3389 (Remote desktop) except my IP. But I am a little scared to do that not to lock myself out. And even in that case, if he knows admin password he can get in some other way than using remote desktop,
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Feb 16, 2007
I'm using windows 2003 Server to host my website.
I was on vacation for 2 weeks so I wasn't able to log onto the server. Nor was there any need to log onto the server as the website was up and running and was fine!
However, when I logged into today, there were extra icons on my desktop.
My server was turned into a spam e-mail remailer. There were applications installed that dissected/generated e-mail addresses.
In my system logs in event viewer, starting from January 30th, there is a whole list of failed log on events where the user tried logging on with different usernames and passwords.
I'm guessing they got into my server by brute force.
I was wondering, does anyone know if windows 2003 automatically logs the IPs of users trying to login remotely and where they are stored?
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Jan 2, 2007
Today while i run some commands like ls this error appeared segmentation falt
any way the reason is my server's hacked now i reinstall it but my question
How could my server hack while i have disabled Compilers for unprivileged users
i admited that i have found cgi-telnet scripts but how could he used it to install rootkit
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Jan 11, 2007
We have a dedicated server with a well known company here in the UK, its running Windows 2003 server std. This runs an application that was developed by our company and accessed by around a max number of users per day of around 50 - max.
Over the last few months the server has got slower and slower, although we do have periods when its really fast, there seems to be nothing we can point our finger at as to why it speeds up and slows down, we checked number of users accessing etc and it does not seem to effect speed (users access by a secure logon)
This week server was nearly at a stand still, I rang hosting company who informed me that they thought our server had been hacked. They said they could see exe files running that they had not installed, mentioned the following -
Dxplay.exe
Dameware.exe
Tree.exe
They said these exe files were listening to a TCP port (excuse my ignorance, not that techically minded)
They also said two users were accessing our server from Canada and California.
They also said because we had loaded our own software on the server it was not their responsibility if our server was hacked, that we were also running PCAnywhere and this was notorious for allowing a server to be hacked.
I pointed out that we paid them to host the server, it was behind their firewall, would that not stop unauthorised access, the response was no.
I have a few questions I wonder somebody might help me with the answers to,
1, Does it appear our server was hacked? - do the exe files look suspicious?
2, What is our hosting companys responsibility?
3, Is PCA secure
4, How can we stop this in future?
I am also told by our guys there is evidence of someone using our server to surf the web, could this be internal, i.e our hosting company, or maybe a hacker?
We can see when users are logged into our application, but nothing else, is there some reporting software we can install to let us view who is accessing our server?
What can we do to make the server more secure?
We are currently scanning it with spyware software and although we have anti virus we are scanning again, this new scan picked up 7 virus, I'm not sure yet what these were.
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May 19, 2007
I have worked with rack911 but he does not answer my emails. is there anyone who can start it immediately?
How can I secure php?
my server is hacked but not so deep.
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Oct 19, 2007
how does one know if their server is being or has been attacked / compromised / DOSed / DDOSed / hacked / you name it?
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Oct 5, 2007
my server was just hacked.
basically every index.htm/html/php in all my accounts (/home/*) have been replaced by some hack page.
i have backups, so not too concerned. problems though are:
1) opening any subfolder in an account causes an endless loop
2) putting any other page and trying to load it from the home directory yields a 500 error message
most likely going ot have to rebuild the entire server... but any ideas what i could look for first?
for e.g. the loop thing is nearly like there's some "global .htaccess file" that's controling every single domain to keep reloading a subfolder called index, which does not exist...
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Apr 14, 2007
I am being hacked & I don't know how they are getting files on my server. They are doing it on two of my domains, I suspended one and then they got it on the other. My FTP access log does not show anything suspicious..
How can I find their doorway?
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May 11, 2009
I am running not so big hosting and do not have much customers. One of our customers have complied to me, that registration mails from his website goes to spam. I searched my IP and found it blacklisted in two databases.
I started to analyze logs, and noticed that from 25th of April something started to happen. Tons of mails are sent, but I do not have such many customers. My mail server is in .lv zone and I have customers witth .lv domains, but mostly some .es mail addresses are there in maillog.
Maillog is full of this records: .....
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Nov 11, 2007
One of my personal servers has been compromised. It is the tornkit v8 rootkit. I tried to follow the instructions here http://www.webhostgear.com/101.html but I dont have write permissions on /etc/rc.d/rc.sysinit to save changes or even delete the file.
I am logged in as root and the file has rwx permissions for owner which root. But I still cant do anything to that file. I get the following message: cannot remove `rc.sysinit': Operation not permitted.
I need to get this server online asap. I am running centos4.2 and logged in as root in recovery mode.
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Jan 20, 2008
the data center tell me we use a lot of bandwidth,
and i check from the mrtg they offer to check,it reach about 80M,
my server really used a lot of bandwidth,
but i login whm to check the bandwidth of accounts,
and it looks likely my customers did not use a lot of bandwidth,
i worry if my server is hacked to attack others or other things,
how can i check this?
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Jun 23, 2007
My hosting provider will shut down my server because it was used by a hacker for DoS attacks.
((outging 2090kbits/sec, incoming 29kbits/sec )
Server got Freebsd 6.2 , apache 2.2, php4.4.7 ,ipfw installed
To be more specific, somehow the hacker can upload a script "udp.pl" into the /tmp directory and then execute it through "perl udp.pl".
The script "udp.pl" does mass flooding on the IP they specify.
The header of udp.pl code is attached at the bottom.
After I deleted "udp.pl"
secured /tmp (noexec,nosuid,rw)
chkrootkit/ rootkit hunter, Checked /etc/passwd for new users and users with UIDs of 0 other than root. Checked for the presence of SUID/SGID root files. nothing found.
installed mod_security2
installed Suhosin
Currently Still have lots of outgoing traffic via port 80 (outging 390kbits/sec, incoming 19kbits/sec )
find nothing suspicius process by using "lsof, top" .....
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Mar 26, 2008
my server hacked and when I trying to login to cpanel and after enter username and password show the hacked page.
help me to change the cpanel page.
and what section I should check?
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Jul 12, 2008
i find a site hacked all the sites are vbulletin and has no protection .. i think it hacked by Fourm home
i mad a search for SSH and i didnt find any thing
can you advice me how to stop this way of hacking plz?
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Oct 2, 2007
My server was recently hacked and I'm looking ways to secure it in the future. I use the server to host my own websites.
It was hacked to be a spam server. I traced the new files the hackers added to my "upload" directory, which is where my site members upload pics. I had set the directory to chmod 777. Could someone hack that directory solely from it being its rights being 777?
The site was custom developed in PHP, and looking through it myself, I couldn't find any security issues. But then again, I may not know what exactly to look up.
I would appreciate any general tips to protecting a server, as well as general tactics hackers use to hack a server and PHP site.
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May 19, 2009
we are looking for a suggestion on a best practice to help a customer recover from being hacked. One thought is that the client should be put on a new server and allowed to rebuild from there. The concern is that there are so many web app breaches that the server often gets rehacked because the bad code is still in the web app.
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Aug 3, 2008
My server with Softlayer was hacked after being 5 Days under attack.
Do you guys have any suggestion about secure data centers
Any hosting we can depand on them when we face a problem?
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Apr 30, 2009
I own a dedi server from HFW few hours ago some hacker injected following php code in some of the domains hosted on the server as follows; ...
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