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Advisories

Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed Transactions

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severity
medium
date
Affecting

  • zebra >= 0, < 6.1.0

CWE
  • CWE-405 Asymmetric Resource Consumption (Amplification)
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
ValarDragon, ebfull, upbqdn
Description
ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion vulnerability that allows unauthenticated peers to degrade block processing by pushing transactions with invalid Orchard proofs without being misbehavior-scored. Attackers can repeatedly push invalid proofs into the shared halo2 batch verifier, forcing honest block proofs onto the slow individual-verification path and slowing block processing roughly sevenfold.

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