CVE-2023-20903 Auth bypass in Cloud Foundry
Attackers with valid refresh tokens from a deactivated identity provider can bypass authentication and access Cloud Foundry resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-20903?
CVE-2023-20903 is a medium-severity authentication bypass vulnerability in Cloud Foundry, published on 28 Mar 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
This disclosure regards a vulnerability related to UAA refresh tokens and external identity providers.Assuming that an external identity provider is linked to the UAA, a refresh token is issued to a client on behalf of a user from that identity provider, the administrator of the UAA deactivates the identity provider from the UAA. It is expected that the UAA would reject a refresh token during a refresh token grant, but it does not (hence the vulnerability). It will continue to issue access tokens to request presenting such refresh tokens, as if the identity provider was still active. As a result, clients with refresh tokens issued through the deactivated identity provider would still have access to Cloud Foundry resources until their refresh token expires (which defaults to 30 days).
Weakness: CWE-613
Which versions are affected by CVE-2023-20903?
It affects 1 product.
Products include Cloudfoundry User Account and Authentication.
How do I fix CVE-2023-20903?
No fix has been published for CVE-2023-20903 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-20903 being exploited?
There is no known exploitation of CVE-2023-20903 in the wild and no public exploit code.
Other vulnerabilities in Cloud Foundry
Sources
Also known as GHSA-5rqc-wqwj-478f.