critical9.8
CVE-2021-42740
Improper Neutralization of Special Elements used in a Command in Shell-quote
Impact
The shell-quote package before 1.7.3 for Node.js allows command injection. An attacker can inject unescaped shell metacharacters through a regex designed to support Windows drive letters. If the output of this package is passed to a real shell as a quoted argument to a command with `exec()`, an attacker can inject arbitrary commands. This is because the Windows drive letter regex character class is `[A-z]` instead of the correct `[A-Za-z]`. Several shell metacharacters exist in the space between capital letter Z and lower case letter a, such as the backtick character.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | shell-quote | >= 1.6.3, <= 1.7.2 | 1.7.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Shell-Quote Project | Shell-Quote | before 1.7.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/substack/node-shell-quote/blob/master/CHANGELOG.md#173
- https://github.com/substack/node-shell-quote/commit/5799416ed454aa4ec9afafc895b4e31760ea1abe
- https://www.npmjs.com/package/shell-quote
- https://github.com/advisories/GHSA-g4rg-993r-mgx7
- https://nvd.nist.gov/vuln/detail/CVE-2021-42740
- https://github.com/ljharb/shell-quote/commit/5799416ed454aa4ec9afafc895b4e31760ea1abe
- https://github.com/ljharb/shell-quote/blob/master/CHANGELOG.md#173