Dear developers and administrators,
the following information may save you some time as it took me a while to figure it out:
Today I noticed some strange issues regarding XML handling in ILIAS with (v5.2.6 2017-07-13, PHP 5.6.31-4+ubuntu16.04.1+deb.sury.org+4). Initially, I discovered a problem in one of my plugins which deals with XML that uses simplexml_load_file() with a local(!) file.
The error message I got from it was:
simplexml_load_file(): I/O warning : failed to load external entity "[MY_FILE]"
I checked everything twice, the 'cwd', the include path, PHP ini settings ...
Surprisingly (for me), I was able to read the contents of the XML file one line before I called simplexml_load_file(). Passing the XML string to simplexml_load_string() worked fine.
The error occured randomly (I initially thought), so I really had no idea what could cause that. Then our administrators reported issues when copying/cloning courses via SOAP in customer installations. I exported and imported the course in question as XML into my local installation (which worked fine) and tried to copy the course to reproduce the reported issue afterwards. It worked perfectly with PHP 7.0, but failed with PHP 5.6. The error log contained the same I/O warning mentioned above.
When I added ...
libxml_disable_entity_loader(false);
... in my plugin before using simplexml_load_file() and before the ILIAS SOAP server is instantiated in ./webservice/soap/server.php, the issue seems to be fixed for both cases.
libxml_disable_entity_loader() is not thread safe, so this is the root of all evil (including but not limited to pineapple on pizza).
If ...
libxml_disable_entity_loader(true);
... is called in another script (or another PHP application) and not resetted to false, the problematic state persists globally. There are even some calls of with a boolean true in ILIAS (PHPExcel, SVG Sanitizer), which is dangerous in case an error occured and the state could not be properly resetted to a boolean false.
Best regards,
Michael
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and also
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Hallo zusammen,
ich finde in den Release-Notes zu 5.2.5 keinerlei Angaben hierzu, wem
ist da etwas bekannt ? Ist das auch in 5.1.x gefixt ?
Michael hat gerade Urlaub.
Ist das kritisch?
-----Ursprüngliche Nachricht-----
Von: CERT-Bund [mailto:certbund@bsi.bund.de]
Gesendet: Donnerstag, 22. Juni 2017 08:17
An: ILIAS
Cc: IT-SiBe
Betreff: Fwd: [CERT-Bund#2017061828000462] XSS-Schwachstelle auf der Lernplattform HS-Bund
Sehr geehrte Damen und Herren,
wir wurden darüber informiert, dass die Lernplattform der HS-Köln aufgrund einer nicht aktuellen ILIAS-Installation verwundbar für eine XSS-Schwachstelle ist.
Website: https://lernplattform.bund.de/
Location: /setup/setup.php?cmd={inject-here}&lang=de
Payload: "><script>alert(1)</script>
Vulnerability: XSS Reflected
Versionen von ILIAS < 5.2.5 sind dafür verwundbar. In der aktuellsten Version ist die Schwachstelle behoben.
Wir empfehlen daher, die ILIAS-Installation auf den neusten Stand zu heben.
Mit freundlichen Grüßen
das Team CERT-Bund
Im Auftrag
Dr. Timo Steffens
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Philipp Hermanns
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------------------------------------------------------------------------
Dear ILIAS admins and members of this mailing list,
This mail is only relevant for you if you have activated Mathjax support in ILIAS to render LaTeX (for mathematical expressions).
The default Mathjax server mentioned in the Mathjax administration of ILIAS has been shut down recently. If you use this URL to render LaTeX in the browser, this won’t work any more. There is a new default Mathjax server available at https://cdnjs.cloudflare.com <https://cdnjs.cloudflare.com/>. To use this server, please enter the following string to the input ‚URL to Mathjax‘ at Administration » Third-Party-Software » Settings » Mathjax :
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-…
For more information about LaTeX support in ILIAS, please join the SIG Mathe+ILIAS : http://www.ilias.de/docu/goto_docu_grp_5183.html
Kind regards,
Matthias
* * * * *
Matthias Kunkel
ILIAS Product Manager
General Manager ILIAS open source e-Learning e.V.
Office:
Ebertplatz 14-16 • D-50668 Koeln
www.ilias.de <http://www.ilias.de/>
verein(a)ilias.de <mailto:verein@ilias.de>
* * * * *
Dear ILIAS-Administrators
Two years ago the versioning of the ILIAS-Source-Code has been moved from Subversion (SVN) to Git. To make the migration for all Installations as smooth as possible, a synchronization from Github to the SVN-Server has been established which synced all the maintained versions of ILIAS (4.3, 4.4, 5.0) back to the SVN-Server. Besides those Release-Branches many Custom-Branches has been used on the SVN-Server.
There are two services which will be obsolete at some point:
- the synchronization from Github to SVN
- the SVN-Server itself
We kindly ask you to participate the following survey: http://www.ilias.de/docu/goto_docu_svy_5157.html
We than are able to decide upon the shutdown-dates of the services mentioned above. Thank you very much!
Best regards
Fabian
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