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CVE-2024-39840 is a remote code execution vulnerability in Factorio before version 1.1.101. The vulnerability arises from the game's support for custom maps, which can include Lua scripts. Certain Lua base module functions are insufficiently restricted, allowing a crafted server to deliver a custom map that executes arbitrary Lua bytecode on connecting clients. This can be abused to generate fake objects and execute arbitrary code on the client system.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Lua exploit script (exp.lua) and a brief readme. The exploit targets Factorio version 1.1.86, specifically its embedded Lua environment, as referenced in the linked writeup (https://memorycorruption.net/posts/rce-lua-factorio/). The script demonstrates advanced memory manipulation primitives in Lua, such as arbitrary read/write and address leaking, by exploiting denormalized double values and Lua's internal structures. It crafts fake objects in memory to gain arbitrary read/write, locates the base address of libc, parses ELF headers to find the address of the 'system' function, and overwrites function pointers to execute arbitrary shell commands. The default payload launches 'kcalc', but the script includes a commented-out reverse shell payload using /dev/tcp/127.0.0.1/9001. The exploit is operational and demonstrates full remote code execution capabilities on a vulnerable Factorio instance. The repository is well-structured for a single-file exploit, with all logic contained in exp.lua and a readme referencing the original research.
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