mirror of
https://github.com/carlospolop/hacktricks
synced 2024-11-25 22:20:43 +00:00
75 lines
5.6 KiB
Markdown
75 lines
5.6 KiB
Markdown
|
|
|
|
<details>
|
|
|
|
<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
|
|
|
|
- Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
|
|
- Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
|
|
- Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
|
|
- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
|
|
|
|
- **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
|
|
|
|
</details>
|
|
|
|
|
|
## **PHP File uploads**
|
|
|
|
**PHP** engine, upon **receiving a POST packet** with RFC 1867 **coded file(s)**, **creates** one or more **temporary files** which are used to **store the uploaded files data**. A PHP script handling file uploads is required to use the move\_uploaded\_file function to move the uploaded temporary file to a place of it's desire (if the script requires the file to exists after it terminates that is). **When the script ends PHP engine removes all temporary files** for files that were uploaded (if any are left after the script ends that is).
|
|
|
|
{% hint style="info" %}
|
|
**As the attacker will usually know where this temporary files are located, in case he found a Local File Inclusion, he might find to load the file being uploaded and get RCE.**
|
|
{% endhint %}
|
|
|
|
The main problem to access the file basically to **guess its name (which will be "random")**.
|
|
|
|
## Windows Exploitation
|
|
|
|
To generate the r**andom name on Windows,** PHP uses the **`GetTempFileName`** function. Looking into documentation we can find the following explanation: The GetTempFileName function creates a temporary file name of the following form:
|
|
|
|
`<path>\<pre><uuuu>.TMP`
|
|
|
|
* The path is `upload_tmp_dir` which normally it's `C:\Windows\Temp`
|
|
* The pre is usually: "php"
|
|
* The \<uuuu> is a unique hex value. However:
|
|
* Only the lower 16 bits of the uUnique parameter are used. This limits GetTempFileName to a maximum of 65,535 unique file names if the lpPathName and lpPrefixStringparameters remain the same. **It's possible to brute-force it.**
|
|
|
|
As we saw, it's fairly **easy** to **find** the **temporary file in Windows systems**. And it's going to get easier because brute force is not needed here, thanks to a certain FindFirstFile quirk which allows **using masks** (<< as \* and > as ?) in LFI paths on Windows. Thanks to this, one can form an **include path like this**:
|
|
|
|
```
|
|
http://site/vuln.php?inc=c:\windows\temp\php<<
|
|
```
|
|
|
|
(In some cases more specific mask might be necessary such as `php1<<` or `phpA<<`). You can Brute-Force more specific masks until you find your uploaded temporary file.
|
|
|
|
## GNU/Linux Exploitation
|
|
|
|
The random value of the file name is good enough to not be neither predictable nor brute-forceable. For more info, check the references.
|
|
|
|
## References
|
|
|
|
* [https://gynvael.coldwind.pl/?id=376](https://gynvael.coldwind.pl/?id=376)
|
|
* [https://gynvael.coldwind.pl/download.php?f=PHP\_LFI\_rfc1867\_temporary\_files.pdf](https://gynvael.coldwind.pl/download.php?f=PHP\_LFI\_rfc1867\_temporary\_files.pdf)
|
|
|
|
|
|
<details>
|
|
|
|
<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
|
|
|
|
- Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
|
|
- Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
|
|
- Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
|
|
- **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
|
|
|
|
- **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
|
|
|
|
</details>
|
|
|
|
|