Client code execution via crafted Lua bytecode
Published Jun 29, 2024 · Updated Aug 2, 2024
Code execution in Factorio before 1.1.101 allows remote attackers controlling a game server to compromise connecting clients. The embedded Lua 5.2.1 runtime exposes load and loadstring to map scripts, while its verifier accepts crafted bytecode that skips FORLOOP type checks and forges objects for arbitrary memory access. A client must connect to the malicious server and download its custom map; the demonstrated chain then executes host commands with the client's privileges.
Summary
What happened
Code execution in Factorio before 1.1.101 allows remote attackers controlling a game server to compromise connecting clients. The embedded Lua 5.2.1 runtime exposes load and loadstring to map scripts, while its verifier accepts crafted bytecode that skips FORLOOP type checks and forges objects for arbitrary memory access. A client must connect to the malicious server and download its custom map; the demonstrated chain then executes host commands with the client's privileges.
The record
- CVE
- CVE-2024-39840
- Published
- Jun 29, 2024
- Updated
- Aug 2, 2024
- Vendor
- Wube Software
- Product
- Factorio
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 29, 2024CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.1.101
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Bytecode Breakdown Factorio Lua exploitfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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