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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTJjNjQtdmo4Zy12d3Jx

Incorrect handling of credential expiry by /nats-io/nats-server

(This advisory is canonically https://advisories.nats.io/CVE/CVE-2020-26892.txt )

Problem Description

NATS nats-server through 2020-10-07 has Incorrect Access Control because of how expired credentials are handled.

The NATS accounts system has expiration timestamps on credentials; the https://github.com/nats-io/jwt library had an API which encouraged misuse and an IsRevoked() method which misused its own API.

A new IsClaimRevoked() method has correct handling and the nats-server has been updated to use this. The old IsRevoked() method now always returns true and other client code will have to be updated to avoid calling it.

The CVE identifier should cover any application using the old JWT API, where the nats-server is one of those applications.

Affected versions

JWT library

NATS Server

Impact

Time-based credential expiry did not work.

Workaround

Have credentials which only expire after fixes can be deployed.

Solution

Upgrade the JWT dependency in any application using it.

Upgrade the NATS server if using NATS Accounts.

Permalink: https://github.com/advisories/GHSA-2c64-vj8g-vwrq
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTJjNjQtdmo4Zy12d3Jx
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 3 years ago
Updated: about 1 year ago


Identifiers: GHSA-2c64-vj8g-vwrq
References: Repository: https://github.com/nats-io/nats-server
Blast Radius: 0.0

Affected Packages

go:github.com/nats-io/jwt
Dependent packages: 543
Dependent repositories: 25,517
Downloads:
Affected Version Ranges: < 1.1.0
Fixed in: 1.1.0
All affected versions: 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.0.8, 0.1.0, 0.2.0, 0.2.2, 0.2.4, 0.2.6, 0.2.8, 0.2.10, 0.2.12, 0.2.14, 0.2.16, 0.3.0, 0.3.2, 1.0.0, 1.0.1
All unaffected versions: 1.1.0, 1.1.1, 1.2.0, 1.2.1, 1.2.2, 2.4.0, 2.4.1, 2.5.0, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.5.7, 2.5.8, 2.6.0, 2.7.0, 2.7.2
go:github.com/nats-io/nats-server/v2
Dependent packages: 6,417
Dependent repositories: 24,884
Downloads:
Affected Version Ranges: < 2.1.9
Fixed in: 2.1.9
All affected versions: 2.0.0, 2.0.2, 2.0.4, 2.1.0, 2.1.2, 2.1.4, 2.1.6, 2.1.7, 2.1.8
All unaffected versions: 2.1.9, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.4.0, 2.5.0, 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5, 2.6.6, 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.9.0, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.9.6, 2.9.7, 2.9.8, 2.9.9, 2.9.10, 2.9.11, 2.9.12, 2.9.14, 2.9.15, 2.9.16, 2.9.17, 2.9.18, 2.9.19, 2.9.20, 2.9.21, 2.9.22, 2.9.23, 2.9.24, 2.9.25, 2.10.0, 2.10.1, 2.10.2, 2.10.3, 2.10.4, 2.10.5, 2.10.6, 2.10.7, 2.10.8, 2.10.9, 2.10.10, 2.10.11, 2.10.12, 2.10.14, 2.10.15, 2.10.16, 2.10.17, 2.10.18, 2.10.19, 2.10.20, 2.10.21, 2.10.22