BREW-synchrony-CVE-2023-45811 — Synchrony deobfuscator prototype pollution vulnerability leading to arbitrary code execution

Affected: Homebrew: synchrony

### Impact

A `__proto__` pollution vulnerability exists in synchrony versions before v2.4.4. Successful exploitation could lead to arbitrary code execution.

### Summary

A `__proto__` pollution vulnerability exists in the [LiteralMap] transformer allowing crafted input to modify properties in the Object prototype.

When executing in Node.js, due to use of the `prettier` module, defining a `parser` property on `__proto__` with a path to a JS module on disk [causes a `require` of the value][prettier/src/main/parser.js] which can lead to arbitrary code execution.

### Patch

A fix has been released in `deobfuscator@2.4.4`.

### Mitigation

- Upgrade synchrony to v2.4.4 - Launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flag

### Proof of Concept

Craft a malicious input file named `poc.js` as follows:

```js // Malicious code to be run after this file is imported. Logs the result of shell command "dir" to the console. console.log(require('child_process').execSync('dir').toString())

// Synchrony exploit PoC { var __proto__ = { parser: 'poc.js' } } ```

Then, run `synchrony poc.js` from the same directory as the malicious file.

### Credits

This vulnerability was found and disclosed by [William Khem-Marquez][SteakEnthusiast].

[LiteralMap]: src/transformers/literalmap.ts [SteakEnthusiast]: https://github.com/SteakEnthusiast [disable-proto]: https://nodejs.dev/en/api/v20/cli/#--disable-protomode [prettier/src/main/parser.…

CVE-2023-45811 — Prototype pollution vulnerability leading to arbitrary code execution in synchrony deobfuscator

Affected: relative synchrony

Synchrony deobfuscator is a javascript cleaner & deobfuscator. A `__proto__` pollution vulnerability exists in versions before v2.4.4. Successful exploitation could lead to arbitrary code execution. A `__proto__` pollution vulnerability exists in the `LiteralMap` transformer allowing crafted input to modify properties in the Object prototype. A fix has been released in `deobfuscator@2.4.4`. Users are advised to upgrade. Users unable to upgrade should launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flags

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BREW-synchrony-CVE-2023-45811 — Synchrony deobfuscator prototype pollution vulnerability leading to arbitrary code execution

CVE-2023-45811 — Prototype pollution vulnerability leading to arbitrary code execution in synchrony deobfuscator