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.

How to fix CVE-2021-42740

To remediate CVE-2021-42740, upgrade the affected package to a fixed version below.

• —upgrade to 1.7.3+~1.7.1-1 or later
• —upgrade to 1.7.3 or later

Is CVE-2021-42740 being exploited?

Moderate — EPSS is 9.0%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (2)

• from 0, < 1.7.3+~1.7.1-1
• >= 1.6.3, < 1.7.3

CVSS scores

References (6)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-42740
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-42740
• PATCHgithub.com/ljharb/shell-quote
• WEBgithub.com/ljharb/shell-quote/blob/master/CHANGELOG.md#173