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I’ve been doing the local usergroup circuit with this lately and have been asked to write it up.

In some ways this is old news, but in other ways…well, I think few realize how absolutely devastating and omnipresent this vulnerability can be. It is an attack vector available in every application I’ve ever seen that takes user input and allows administrators to bulk export to CSV.

That is just about every application.

Edit: Credit where due, I’ve been pointed to this article from 2014 by an actual security pro which discusses some of these vectors . And another one .

Edit:

So let’s set the scene - imagine a time or ticket tracking app. Users enter their time (or tickets) but cannot view those of other users. A site administrator then comes along and exports entries to a csv file, opening it up in a spreadsheet application. Pretty standard stuff.

So we all know csv files. Their defining characteristic is that they are simple. These exports might look like this

Simple enough. Nothing dangerous there. Heck the even states:

CSV files contain passive text data that should not pose any risks.

So even by specification, it should all be fine.

Hey, just for fun let’s try something, let’s modify our CSV file to the following

Huh…well that’s odd. Even though that cell was quoted it seems to have been interpreted as a formula just because the first character was an = symbol. In fact - in Excel at least - any of the symbols = , - , + , or @ will trigger this behavior causing lots of fun times for adminstrators whose data just doesn’t seem to format correctly (this is actually what brought my attention first to the issue). That’s strange, but not downright dangerous , right?

dangerous

Well hold on, a formula is code that executes. So a user can cause code - even if its only formula code - to execute on an administrator’s machine in their user’s security context.

What if we change our csv file to this then? (Note the Description column on the last line)

What’s going to happen when we open up in Excel?

Yup, that’s right, the system calculator opens right on up.

Now to be fair, there is absolutely a warning . It’s just that the warning is a big block of text, which nobody is going to read. And even if they do, it explicitly recommends:

FOIS 2018

The 10th International Conference on Formal Ontology in Information Systems

Important Dates

Workshop/tutorial Proposal Submission: 2 March 2018

2 March 2018

Paper Submission Deadline: 13 April 2018

13 April 2018

Notification: 30 May 2018

30 May 2018

Camera-ready papers: 24 June 2018

24 June 2018

Conference: 17 – 21 September, 2018

17 – 21 September, 2018

Organized by The International Association for Ontology and its Applications

The 10th International Conference on Formal Ontology in Information Systems, FOIS 2018 , will be held in Cape Town, South Africa, 17-21 September 2018, following the 4th Interdisciplinary School on Applied Ontology, ISAO 2018 that will take place between 10-14 September 2018.

ISAO 2018

Definition and Scope

The advent of complex information systems which rely on robust, coherent and formal representations of their subject matter, led in the last 25 years to the exploitation of ontological analysis and ontology-based representation. The systematic study of such representations, their axiomatics, their corresponding reasoning techniques and their relations to cognition and reality, are at the center of the modern discipline of formal ontology.

Formal ontology is now a research focus in such diverse domains as conceptual modeling, database design, knowledge engineering, software engineering, organizational modeling, artificial intelligence, robotics, computational linguistics, the life sciences, bioinformatics, geographic information science, information retrieval, and the Semantic Web. Researchers in all these areas increasingly recognize the need for serious engagement with ontology, understood as a general theory of the types of entities and relations making up their respective domains of enquiry, to provide a solid foundation for their work.

The FOIS conference is a meeting point for researchers from all disciplines with an interest in formal ontology. The conference encourages submission of new and high quality articles on both theoretical issues and concrete applications. As in previous years, FOIS 2018 is intended as a nexus of interdisciplinary research and communication.

FOIS is the flagship conference of the International Association for Ontology and its Applications (IAOA, website: http://iaoa.org/ ), which is a non-profit organization aiming to promote interdisciplinary research and international collaboration at the intersection of philosophical ontology, linguistics, logic, cognitive science, and computer science, as well as in the applications of ontological analysis to conceptual modeling, knowledge engineering, knowledge management, information-systems development, library and information science, scientific research, and semantic technologies in general.

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