x/vulndb: potential Go vuln in github.com/nats-io/nats-server/v2: GHSA-hmm9-r2m2-qg9w

[GoVulnBot]

In GitHub Security Advisory GHSA-hmm9-r2m2-qg9w, there is a vulnerability in the following Go packages or modules:

Unit	Fixed	Vulnerable Ranges
github.com/nats-io/nats-server/v2	2.1.9	< 2.1.9

See doc/triage.md for instructions on how to triage this report.

package: github.com/nats-io/nats-server/v2
versions:
  - introduced: v0.0.0
    fixed: v2.1.9
description: |-
    (This advisory is canonically <https://advisories.nats.io/CVE/CVE-2020-26521.txt>)

    ## Problem Description

    The NATS account system has an Operator trusted by the servers, which signs Accounts, and each Account can then create and sign Users within their account.  The Operator should be able to safely issue Accounts to other entities which it does not fully trust.

    A malicious Account could create and sign a User JWT with a state not created by the normal tooling, such that decoding by the NATS JWT library (written in Go) would attempt a nil dereference, aborting execution.

    The NATS Server is known to be impacted by this.


    ## Affected versions

    #### JWT library

     * all versions prior to 1.1.0

    #### NATS Server

     * Version 2 prior to 2.1.9


    ## Impact

    #### JWT library

     * Programs would nil dereference and panic, aborting execution by default.

    #### NATS server

     * Denial of Service caused by process termination


    ## Workaround

    If your NATS servers do not trust any accounts which are managed by untrusted entities, then malformed User credentials are unlikely to be encountered.


    ## Solution

    Upgrade the JWT dependency in any application using it.

    Upgrade the NATS server if using NATS Accounts.
published: 2021-05-21T16:22:10Z
last_modified: 2021-05-21T16:22:10Z
ghsas:
  - GHSA-hmm9-r2m2-qg9w

[gopherbot]

Change https://go.dev/cl/414820 mentions this issue: x/vulndb: add reports/GO-2022-0402.yaml for CVE-2020-26521

[gopherbot]

Change https://go.dev/cl/423038 mentions this issue: reports: add missing GHSAs