dhis2-devs team mailing list archive

[Hannan Khan <hannank@xxxxxxxxx>]

Thanks Jason for your comprehensive advice.

I tried to identify problem roots and I believe I find those files. And
there is no problem so far.
>From the beginning I am running tomcat service as user who cannot login to
the system.
Point 2 and 3 I have to do. But earlier our another serer running on port
80 severely damaged by hacker attack (web server). I will be keep in-touch
on this.
Any firewall you suggests? Also consider we have very narrow bandwidth;
only 10 Mbps for 9 dhis2 systems with near about 12000 users average 300
concurrent user in top three systems;
Updates we are run weekly basis.
Point 6 and 7 I will do. How that will effect the system performance?

Regards

Hannan



On Thu, Feb 6, 2014 at 1:18 PM, Jason Pickering <jason.p.pickering@xxxxxxxxx
> wrote:

> Hi Hannan,
> I had several servers (4 to be exact) which were compromised due to a
> vulnerability in Struts. Lars sent out an email a few weeks ago, that
> informed everyone they needed to upgrade immediately. I know of other
> server which have also been compromised. One was running Tomcat as root (an
> exceptionally bad idea). Because of the compromise, a full reinstallation
> of the server software would be required.
>
> In your case, it does seem to be a bit more serious, and not consistent
> with the previous compromises I have seen. These compromises were limited
> to the machine sending out a huge amount of traffic, but otherwise, there
> did not "seem" to be any further issues.
>
> A few tips, you may want to consider
>
> 0) A complete reinstall of the system might be in order, given the extent
> of the attack.
> 1) Be sure that the Tomcat process is not running as root, and that the
> user which can execute Tomcat cannot login to the system directly (i.e. has
> their shell set to /bin/false)
> 2) Close port 8080 and remove the Tomcat manager. Instead, only have port
> 80/443  on the machine open. Additionally, do not run SSH on port 22, and
> be sure that you can only login to the server with a key, which is
> protected itself by a strong password.
> 3) Consider attempting to look for vulnerabilities your self, with tools
> such as Nessus and Nmap
> 4) Ensure that you are running a firewall on the server itself, i.e. do
> not trust your upstream providers firewall.
> 5) Ensure that all Tomcat installs, Java,DHIS2 and the system software
> itself is fully up to date
> 6) Consider running an IDS such as OSSEC on your machine to look for
> unauthorized intrusions.
> 7) Use tools such as monit to monitor for spurious processes or suspicious
> file activity.
>
> Hope this helps.
>
> Best regards,
> Jason
>
>
>
>
>
> On Thu, Feb 6, 2014 at 8:36 AM, Hannan Khan <hannank@xxxxxxxxx> wrote:
>
>> Yes Morten, I installed through the package manager.
>>
>> The tomcat version is Apache Tomcat/7.0.26.
>>
>> Regards
>>
>> Hannan
>>
>>
>> On Thu, Feb 6, 2014 at 12:07 PM, Morten Olav Hansen <mortenoh@xxxxxxxxx>wrote:
>>
>>> Also make sure that your tomcat is up to date.. there exists several
>>> vulnerabilities in older versions
>>>
>>> (not sure how you installed it, but if you are using a linux
>>> distribution, its wise to install it through the package manager)
>>>
>>> --
>>> Morten
>>>
>>>
>>> On Thu, Feb 6, 2014 at 1:00 PM, Knut Staring <knutst@xxxxxxxxx> wrote:
>>>
>>>> Hannan, which build of DHIS2 ? Which Java version? Ubuntu?
>>>>
>>>> Sent from my mobile
>>>> On Feb 6, 2014 6:29 AM, "Hannan Khan" <hannank@xxxxxxxxx> wrote:
>>>>
>>>>> Dear experts
>>>>>
>>>>> Our main DHIS2 implementation (mishealth) for the health sector was
>>>>> hacked yesterday evening, around 4:30 PM local time. After login by any
>>>>> user it showing the attached message. We immediately stop the tomact7
>>>>> service and check the database. We find the database is intact.
>>>>>
>>>>> After investigation I find that the hacker inserted three files to do
>>>>> this.
>>>>>
>>>>> First file "index.html" contain an alert "alert("Admin, You Are Hacked
>>>>> by Malaysia Hacker!")"  and a body text <h1>Hacked by BadCat</h1>. Which
>>>>> was placed in the application folder /tomcat7/webapps/mishealth/.
>>>>>
>>>>> Second files "index.html" contain another script which redirects to "
>>>>> pastebin.com/raw.php?i=LZEdbBz6" was placed in
>>>>> the /tomcat7/webapps/mishealth/dhis-web-commons/security/.
>>>>>
>>>>> Third file "guige.jsp" is contain a script was placed in
>>>>> the /tomcat7/webapps/mishealth/dhis-web-commons/security/.
>>>>>
>>>>> For our server, it seems that only first file is executing after
>>>>> login. I find few more suspicious files which I am investigating and will
>>>>> share with the experts in next few days.
>>>>>
>>>>> I configured the server with only external open port is 8080. Other
>>>>> two ports (SSH and WEBMIN) are open for internal IP only. External access
>>>>> is possible only through VPN client. According to the firewall maintaining
>>>>> vendor, that hacker might access through 8080. How we prevent and secure
>>>>> that?
>>>>>
>>>>> I configure the database in other server and that server is only
>>>>> accessible through one private IP block. The tomcat server, the backup
>>>>> servers and our administrator/development team are in that block.
>>>>>
>>>>> Now please suggest how can we secure our servers more.
>>>>>
>>>>> Regards
>>>>>
>>>>> Muhammad Abdul Hannan Khan
>>>>> --------------------------------------------------
>>>>> Senior Technical Advisor - HIS
>>>>> Priority Area Health
>>>>> Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH
>>>>> House10/A, Road 90, Gulshan 2, Dhaka 1212, Bangladesh
>>>>>
>>>>> T +880-2- 8816459, 8816412 ext 118
>>>>> M+88 01819 239 241
>>>>> M+88 01534 312 066
>>>>> F +88 02 8813 875
>>>>> E hannan.khan@xxxxxx
>>>>> S hannan.khan.dhaka
>>>>> B hannan-tech.blogspot.com
>>>>>
>>>>>
>>>>
>>>
>>
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>