Advisories for Golang/Github.com/Nats-Io/Jwt/V2 package

NATS Server 2.x before 2.2.0 and JWT library before 2.0.1 have Incorrect Access Control because Import Token bindings are mishandled.

The NATS server provides for Subjects which are namespaced by Account; all Subjects are supposed to be private to an account, with an Export/Import system used to grant cross-account access to some Subjects. Some Exports are public, such that anyone can import the relevant subjects, and some Exports are private, such that the Import requires a token JWT to prove permission. The JWT library's validation of the bindings in the …

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-62mh-w5cv-p88c (for github.com/nats-io/jwt) and GHSA-j756-f273-xhp4 (for github.com/nats-io/nats-server). This link is maintained to preserve external references. Original Description NATS Server (github.com/nats-io/nats-server/v2/server) 2.x before 2.2.0 and JWT library (github.com/nats-io/jwt/v2) before 2.0.1 have Incorrect Access Control because Import Token bindings are mishandled.

(This advisory is canonically https://advisories.nats.io/CVE/CVE-2021-3127.txt) Problem Description The NATS server provides for Subjects which are namespaced by Account; all Subjects are supposed to be private to an account, with an Export/Import system used to grant cross-account access to some Subjects. Some Exports are public, such that anyone can import the relevant subjects, and some Exports are private, such that the Import requires a token JWT to prove permission. The JWT …