Vulnerability · Published Apr 6, 2020 · Assigned by GitHub_M

CVE-2020-5300Disallow replay of `private_key_jwt` by blacklisting JTIs in Hydra

Medium 5.8

In plain English

A medium-severity security flaw in hydra from ory. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.8Medium

Exploit odds (30 days)1.0%top 36.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/ory/hydra	1.4.0	GHSA-3p3g-vpw6-4w66
Go	github.com/ory/hydra	1.4.0	GO-2022-0786

Affected products (as reported)

Vendor	Product	Versions
ory	hydra	< 1.4.0+oryOS.17

Weakness: CWE-294 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

References

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