: Once triggered, an attacker could simply connect to the target's IP on port 6200 using a tool like netcat to gain full control. GitHub Resources and Links
This report analyzes the infamous security vulnerability affecting VSFTPD version 2.3.4. In July 2011, it was discovered that the official download repository for VSFTPD had been compromised. An attacker injected a backdoor into the source code, creating a critical vulnerability that allows remote unauthenticated users to gain root shell access. While the vulnerability is over a decade old, it remains a staple in cybersecurity education and penetration testing labs (such as Metasploitable).
The exploit is still publicly available on GitHub and other exploit repositories, making it easy for attackers to use. Additionally, the vulnerability has been incorporated into various exploit kits and frameworks, making it even easier to use.
When searching GitHub for this exploit, you will generally find three categories of repositories: vsftpd 208 exploit github link
The most common "exploit" searches for vsftpd on GitHub center around the following: PwnHouse/OSVDB-73573/README.md at master - GitHub
This can be done using a simple netcat ( nc ) client. In the below interaction, the backdoor is triggered when connecting to port 21. After triggering, the client immediately connects to the backdoor port (6200) to get a shell.
The term "vsftpd 208" is likely a misconception or typo resulting from a misunderstanding of the version or a specific lab scenario. The actual vulnerability is CVE-2011-2523, which affects VSFTPD version 2.3.4 released between June 30 and July 1, 2011. What is the VSFTPD 2.3.4 Backdoor? : Once triggered, an attacker could simply connect
Open a new terminal and connect to the server on port 6200:
Because the FTP daemon often runs with high privileges, any attacker connecting to port 6200 gained instant, unauthenticated root command-line access to the server. Finding Exploit Links on GitHub: A Word of Caution
strings /usr/sbin/vsftpd | grep -i ":)"
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The malicious code snippet inserted into sysdeputil.c looks similar to this: