dhis2-devs team mailing list archive

[Brajesh Murari <brajesh.murari@xxxxxxxxx>]

Dear Lars,

Its great news for DHIS2 regular users and system administrators, that one of big security vulnerability has been found/detected and remedial action can be taken to resolve the problem. But i am not that much sure that most of the implementers would like to upgrade live application on their server only for this problem, who are using DHIS 2.12build as an assumption as a very good stable release in series so far since they are using DHIS 2. Its good that application should be upgraded DHIS 2.12 to DHIS 2.13 on live servers, but at the same time scrum masters should also release some stable patches releases as well for DHIS 2.12 release for fixingabove stated like problems, that will prevent unnecessary wastage of time and money in system application version up-gradation only for fixing miner problem. Because in normal and general software implementation practices, we use to release patches to fix these types of issues, at the same time implementers
 expectations are the same. 


Regards 

Brajesh Murari

------------------------------------------------------------------------------------------------
Life Is A Collection of Poems.



On Wednesday, 25 December 2013 6:54 PM, Lars Helge Øverland <larshelge@xxxxxxxxx> wrote:
 
Hi,

we have recently detected a security exploit on a couple of servers running dhis. The exploit seems to result in shell access with permissions of the user which is running tomcat.


Symptoms of the exploit are presence of:

- a file /tmp/fake.cfg.
- various files with numeric-only names in /tmp directory.
- massive outgoing network traffic (> 200 Gb per day).

The files will be owned by the user running tomcat. The outgoing network traffic is likely to be part of denial-of-service attacks against other servers.


Cause of the exploit is likely to be one or more weaknesses in Struts 2, which is a web framework used in dhis. These weaknesses have been fixed in Struts version 2.3.15.1. We have upgraded dhis version 2.12, 2.13 and snapshot/trunk with the new version. You can download the new WAR files from dhis2.org/downloads as usual.


To remove the exploit you should do the following:

- stop tomcat
- upgrade your dhis version (to 2.12 or 2.13)
- remove all of the above mentioned files from /tmp (all owned by tomcat user).
- kill all processes owned by the tomcat user, or simply reboot the server.
- delete all files and folders under <tomcat-install-dir>/work/Catalina (not confirmed but to be on the safe side).

If you have been running tomcat as root (sudo) then a full operating system re-install is recommended. There is no way to completely verify what an exploit can do with full permissions. Running tomcat as root is strictly discouraged in any case.


Summary

- In any case you should upgrade your dhis version, whether you see the symptoms or not.
- If you see the symptoms but have been running dhis with regular, non-root privileges, you will be fine by following the removal steps.
- If you see the symptoms and have been running dhis with root privileges, you should do a clean server installation.


regards,

Lars




















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