CVE-2017-18924 — oauth2-server (aka node-oauth2-server) through 3

oauth2-server (aka node-oauth2-server) through 3.1.1 implements OAuth 2.0 without PKCE. It does not prevent authorization code injection. This is similar to CVE-2020-7692. NOTE: the vendor states 'As RFC7636 is an extension, I think the claim in the Readme of "RFC 6749

01What is this vulnerability?

oauth2-server (aka node-oauth2-server) through 3.1.1 implements OAuth 2.0 without PKCE. It does not prevent authorization code injection. This is similar to CVE-2020-7692. NOTE: the vendor states 'As RFC7636 is an extension, I think the claim in the Readme of "RFC 6749 compliant" is valid and not misleading and I also therefore wouldn't describe this as a "vulnerability" with the library per se.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2020-10-04T04:38:47.000Z
• Last modified: 2024-08-05T21:45:24.546Z

09References

• tools.ietf.org — https://tools.ietf.org/html/rfc7636
• tools.ietf.org — https://tools.ietf.org/html/draft-ietf-oauth-security-topics-15
• codeburst.io — https://codeburst.io/missing-the-point-in-securing-oauth-2-0-83968708b467
• github.com — https://github.com/oauthjs/node-oauth2-server/issues/637
• github.com — https://github.com/oauthjs/node-oauth2-server/pull/452