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The `bigint-buffer` library is vulnerable to a buffer overflow in the `toBigIntLE()` function due to insufficient bounds checking when converting buffer data into a BigInt. This occurs when processing large or malformed input buffers, allowing an attacker to write beyond the allocated memory space. The overflow can lead to application crashes or potential remote code execution (RCE) if exploited carefully.
When `toBigIntLE()` reads a buffer in little-endian format, it fails to validate the buffer length before conversion. If an attacker supplies a buffer larger than expected, the function attempts to read beyond its bounds, corrupting adjacent memory. This vulnerability affects versions 0.0.0 through 1.1.5.
DailyCVE Form:
Platform: Node.js
Version: 0.0.0 – 1.1.5
Vulnerability: Buffer Overflow
Severity: High
Date: 2025-04-04
What Undercode Say:
Exploitation:
1. Craft a malicious buffer exceeding expected size:
const { toBigIntLE } = require('bigint-buffer');
const largeBuffer = Buffer.alloc(1024).fill(0x41); // Overflow trigger
toBigIntLE(largeBuffer); // Crashes process
2. Heap grooming for RCE (hypothetical):
const overwriteBuffer = Buffer.allocUnsafe(64); // Manipulate memory layout for shellcode injection
Protection:
1. Update to `[email protected]` or later.
2. Validate buffer length before processing:
function safeToBigIntLE(buf) {
if (buf.length > 8) throw new Error("Invalid buffer size");
return toBigIntLE(buf);
}
3. Use Node.js `–max-old-space-size` to limit memory abuse.
Detection:
1. Scan dependencies with:
npm audit
2. Static analysis with ESLint rule:
"rules": {
"no-unsafe-buffer": "error"
}
Mitigation Commands:
npm install bigint-buffer@latest --save
Debugging:
Check crash dumps with:
node --abort-on-uncaught-exception app.js
References:
References:
Reported By: https://github.com/advisories/GHSA-3gc7-fjrx-p6mg
Extra Source Hub:
Undercode
