Lua Command Injection: Examples and Prevention

As the internet evolves, many advanced users desire to customize their software experiences through coding, leading to the popularity of languages like Lua, which is known for its ease of use and ability to be embedded in various applications. Despite its advantages, embedding a programming language like Lua introduces security risks, particularly command injection attacks, where unexpected input executes arbitrary commands, potentially compromising system security. A notable example involved a command injection vulnerability in the VeraEdge Home Controller, where inadequate input verification allowed attackers to execute unauthorized commands via Lua scripts. The article discusses strategies to prevent such attacks, including input sanitization, using a sandbox, and enforcing proper access controls to limit script privileges. Understanding these vulnerabilities and prevention methods is crucial in safeguarding applications utilizing Lua, as demonstrated through a practical case study and expert insights from Eric Goebelbecker, a seasoned developer with extensive experience in the financial sector.