CVE-2020-5300 Information

Description

In Hydra (an OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go) before version 1.4.0+oryOS.17 when using client authentication method ‘private_key_jwt’ [1] OpenId specification says the following about assertion jti: \A unique identifier for the token which can be used to prevent reuse of the token. These tokens MUST only be used once unless conditions for reuse were negotiated between the parties. Hydra does not check the uniqueness of this jti value. Exploiting this vulnerability is somewhat difficult because: - TLS protects against MITM which makes it difficult to intercept valid tokens for replay attacks - The expiry time of the JWT gives only a short window of opportunity where it could be replayed This has been patched in version v1.4.0+oryOS.17

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

https://github.com/ory/hydra/commit/700d17d3b7d507de1b1d459a7261d6fb2571ebe3 https://github.com/ory/hydra/releases/tag/v1.4.0 https://github.com/ory/hydra/security/advisories/GHSA-3p3g-vpw6-4w66

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3