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docs: add server-side parameter pollution notes

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HTTP Parameter Pollution/README.md
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@ -7,7 +7,9 @@
* [Tools](#tools)
* [Methodology](#methodology)
* [Parameter Pollution Table](#parameter-pollution-table)
* [Server-Side Parameter Pollution](#server-side-parameter-pollution)
* [Parameter Pollution Payloads](#parameter-pollution-payloads)
* [Labs](#labs)
* [References](#references)
## Tools
@ -55,6 +57,19 @@ When ?par1=a&par1=b
| Python/Zope | All occurrences in array | ['a','b'] |
| Ruby on Rails | Last occurrence | b |
### Server-Side Parameter Pollution
Server-side parameter pollution can happen when an application forwards user-controlled input into a backend API query string. URL-encoded delimiters can be used to test whether the backend request is parsed differently after decoding.
```ps1
/api/search?query=test%26debug=true
/api/search?query=test%23
/reset?email=User@example.com%26email=Administrator@example.com
/profile?user=User%26user=Administrator
```
Compare the responses with and without encoded delimiters. Check whether the injected delimiter creates a new backend parameter, overrides an existing one, or truncates parameters appended by the application.
### Parameter Pollution Payloads
* Duplicate Parameters:
@ -93,6 +108,10 @@ When ?par1=a&par1=b
}
```
## Labs
* [PortSwigger Web Security Academy - Exploiting server-side parameter pollution in a query string](https://portswigger.net/web-security/api-testing/server-side-parameter-pollution/lab-exploiting-server-side-parameter-pollution-in-query-string)
## References
* [How to Detect HTTP Parameter Pollution Attacks - Acunetix - January 9, 2024](https://web.archive.org/web/20260112091623/https://www.acunetix.com/blog/whitepaper-http-parameter-pollution/)