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CVE-2021-42740

Description

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.

POC

Reference

- https://www.npmjs.com/package/shell-quote

Github

- https://github.com/ARPSyndicate/cvemon

- https://github.com/MaySoMusician/geidai-ikoi

- https://github.com/grafana/plugin-validator