CVE-2021-21384 – shescape

Package

Manager: npm
Name: shescape
Vulnerable Version: >=0 <1.1.3

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N

CVSS v4.0: CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00165 pctl0.38063

Details

Null characters not escaped ### Impact Anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a [null character](https://en.wikipedia.org/wiki/Null_character) into the payload. For example (on Windows): ```javascript const cp = require("child_process"); const shescape = require("shescape"); const nullChar = String.fromCharCode(0); const payload = "foo\" && ls -al ${nullChar} && echo \"bar"; console.log(cp.execSync(`echo ${shescape.quote(payload)}`)); // foototal 3 // drwxr-xr-x 1 owner XXXXXX 0 Mar 13 18:44 . // drwxr-xr-x 1 owner XXXXXX 0 Mar 13 00:09 .. // drwxr-xr-x 1 owner XXXXXX 0 Mar 13 18:42 folder // -rw-r--r-- 1 owner XXXXXX 0 Mar 13 18:42 file ``` ### Patches The problem has been patched in [v1.1.3](https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3) which you can upgrade to now. No further changes are required. ### Workarounds Alternatively, null characters can be stripped out manually using e.g. `arg.replace(/\u{0}/gu, "")`

Metadata

Created: 2021-03-18T23:47:56Z
Modified: 2021-03-18T23:43:39Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-f2rp-38vg-j3gh/GHSA-f2rp-38vg-j3gh.json
CWE IDs: ["CWE-88"]
Alternative ID: GHSA-f2rp-38vg-j3gh
Finding: F014
Auto approve: 1