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Date: Thu, 15 Nov 2018 10:26:29 -0600
From: Ryan Delaney <>
Subject: [FD] Budabot !calc Denial of Service

# Exploit Title: Budabot !calc Denial of Service
# Date: 15-10-2018
# Exploit Author: Ryan Delaney
# Author Contact:
# Author LinkedIn:
# Vendor Homepage:
# Software Link:
# Version: 0.6 -> 4.0
# Tested on: 4.0
# CVE: CVE-2018-19290

1. Description

In modules/HELPBOT_MODULE in Budabot 0.6 through 4.0, lax syntax validation
allows remote attackers to perform a command injection attack against the
PHP daemon with a crafted command, resulting in a denial of service or
possibly unspecified other impact. In versions before 3.0,
modules/HELPBOT_MODULE/calc.php has the vulnerable code; in 3.0 and above,
modules/HELPBOT_MODULE/HelpbotController.class.php has the vulnerable code.

2. Proof of Concept

Start the Budabot listener, set valid configuration options, and wait for
the chatbot to announce it's ready in-game.
Send the chatbot a private message containing "!calc 5 x 5", and the
Budabot listener will terminate.

3. Solution

Edit the relevant file to remove "x" and " " (space) from the strspn() mask.

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