A popular repository for demonstrating this is DoctorKisow/vsftpd-2.3.4 , which contains the backdoor patch, as shown in the GitHub repo details. Installing and Running the vsftpd-2.3.4 Backdoor
Typical install/build instructions (educational/test lab use only)
: Update to the latest stable version of VSFTPD via your system's package manager ( sudo apt-get update && sudo apt-get install vsftpd ).
https://github.com/nhattruongniit/vsftpd-2.0.8-exploit vsftpd 208 exploit github install
# Clone a common vulnerable VSFTPD environment from GitHub git clone https://github.com # Navigate to the specific VSFTPD directory cd vulhub/vsftpd/2.3.4 Use code with caution. Step 2: Install and Launch the Container
The (commonly referred to in your query context as "vsftpd 208" due to version naming variations or scanning banner results) is a famous supply chain vulnerability identified as CVE-2011-2523 . It involves a malicious backdoor that was intentionally added to the source code of vsftpd version 2.3.4 between June 30 and July 3, 2011. Core Vulnerability Mechanism
: An attacker can then connect to this port using a tool like Netcat to execute arbitrary commands with root privileges. Installing the Vulnerable Version for Labs Step 2: Install and Launch the Container The
The vulnerability exists in the str_parse_login section of the code. When the server detects the :) sequence in a username, it executes a function called vsf_sysutil_extra() . This function opens a listening socket on port 6200. An attacker can then connect to this port using a tool like telnet or netcat to gain immediate, unauthenticated root access to the system. Lab Setup and Installation VSFTPD 2.3.4 Backdoor Command Execution - Rapid7
To cover this comprehensively, I need to gather information from multiple sources. The search plan includes five parallel searches: general information about the vsftpd 2.0.8 backdoor, GitHub repositories with exploits, installation guides, Metasploit modules, and detection methods. I will execute all these searches simultaneously to get a broad overview. search results for the backdoor exploit show a GitHub repository for demonstration, LinkedIn posts about ethical hacking, and other pages. The search for "vsftpd 208 exploit github" returns some repositories, but they might be for a different version. The installation guide search returns some results that might include installation instructions for vsftpd, but not specifically for the exploit. The Metasploit search returns results related to the vsftpd 2.3.4 backdoor, which is likely the same vulnerability. The detection search returns some technical details.
Once the GitHub-sourced container is running, you can test the exploit manually using standard networking tools to understand the mechanics behind automation scripts like Metasploit. Step 1: Reconnaissance Installing the Vulnerable Version for Labs The vulnerability
Metasploit provides an efficient module for this. As detailed by West Oahu's cyber security guide , this allows for rapid testing. Start MSFconsole: msfconsole Search for the module: search vsftpd 2.3.4 Use the exploit: use exploit/unix/ftp/vsftpd_234_backdoor Set target: set RHOSTS Run: exploit Remediating the Vulnerability
# Run the exploit against the target python exploit.py [target_ip] Use code with caution.
: If a user attempted to log in with a username containing a smiley face emoticon ( :) ), the server would secretly open a command shell listening on a high port.
The exploit code is written in Ruby and uses the Metasploit framework. Here is a snippet of the code:
Because this is a well-documented historic vulnerability, several GitHub repositories provide the vulnerable source code for educational purposes, allowing researchers to compile and test the exploit in labs.