CVE-2020-15222 Replay of private_key_jwt possible in ORY Fosite
Attackers can replay private_key_jwt assertions in ORY Fosite due to missing jti uniqueness checks, bypassing authentication protections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-15222?
CVE-2020-15222 is a high-severity vulnerability in ory fosite, published on 24 Sep 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
In ORY Fosite (the security first OAuth2 & OpenID Connect framework for Go) before version 0.31.0, when using "private_key_jwt" authentication the uniqueness of the `jti` value is not checked. When using client authentication method "private_key_jwt", 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 seem to check the uniqueness of this `jti` value. This problem is fixed in version 0.31.0.
Which versions are affected by CVE-2020-15222?
3 open source packages ship an affected version, including github.com/ory/fosite. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/ory/fosite Go | All versions | 0.31.0 |
github.com/ory/fosite Go | All versions | 0.31.0 |
github.com/ory/fosite Go | All versions | 0.31.0 |
Products include Ory Fosite.
How do I fix CVE-2020-15222?
Upgrade github.com/ory/fosite to 0.31.0 or later.
Is CVE-2020-15222 being exploited?
There is no known exploitation of CVE-2020-15222 in the wild and no public exploit code.
Other vulnerabilities in ory fosite
Sources
Also known as GHSA-v3q9-2p3m-7g43, GO-2021-0110.