Description
Zebra before 6.4.0 contains an uncontrolled resource consumption vulnerability that allows unauthenticated peers to force full proof verification by serving forged block bodies with valid header hashes. Attackers can flip authorizing-only bytes such as a coinbase scriptSig, wasting Sapling, Orchard, and Ironwood proof verification without penalty and stalling sync for 67 seconds.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ZcashFoundation | zebra | < 6.4.0 | 6.4.0 |
References
- GitHub Security Advisory (GHSA-3c94-hf7p-g5mf) vendor-advisory
- VulnCheck Advisory: Zebra before 6.4.0 Denial of Service via Same-Hash Forged Block Bodies third-party-advisory