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Advisories

Zebra before 6.2.1 Denial of Service via Uncapped V6 Shielded Proof Verification

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severity
high
date
Affecting

  • zebra >= 0, < 6.2.1

CWE
  • CWE-405 Asymmetric Resource Consumption (Amplification)
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
craftsoldier, conradoplg, upbqdn
Description
Zebra (zebrad) before 6.2.1 contains an asymmetric resource consumption vulnerability that allows unauthenticated peers to stall block verification by pushing V6 mempool transactions with invalid Halo2 proofs. Attackers can flood the shared unprioritized Halo2 verification queue with zero-fee transactions carrying zero-filled Orchard and Ironwood proofs, causing nodes to fall behind the chain tip.

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