CVE-2023-42448 Business logic in hydra
A malicious participant can modify the contestation deadline during a Close transaction, allowing unauthorized fund distribution or blocking fund redistribution in Hydra.
- 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-2023-42448?
CVE-2023-42448 is a high-severity vulnerability in input-output-hk hydra, published on 4 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Hydra is the layer-two scalability solution for Cardano. Prior to version 0.13.0, the specification states that the contestation period in the datum of the UTxO at the head validator must stay unchanged as the state progresses from Open to Closed (Close transaction), but no such check appears to be performed in the `checkClose` function of the head validator. This would allow a malicious participant to modify the contestation deadline of the head to either allow them to fanout the head without giving another participant the chance to contest, or prevent any participant from ever redistributing the funds locked in the head via a fan-out. Version 0.13.0 contains a patch for this issue.
Which versions are affected by CVE-2023-42448?
It affects 1 product.
Products include Iohk Hydra.
How do I fix CVE-2023-42448?
No fix has been published for CVE-2023-42448 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-42448 being exploited?
There is no known exploitation of CVE-2023-42448 in the wild and no public exploit code.
Other vulnerabilities in input-output-hk hydra
Sources
Also known as GHSA-mgcx-6p7h-5996.