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Advisories

Zebra before 6.4.0 Gossiped Block Drop via Forged Coinbase scriptSig Height

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severity
medium
date
Affecting

  • zebra >= 0, < 6.4.0

CWE
  • CWE-354 Improper Validation of Integrity Check Value
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
craftsoldier, arya2, conradoplg, mpguerra
Description
Zebra before 6.4.0 contains an improper integrity validation vulnerability in the inbound gossip download path that allows unauthenticated peers to force dropping of new blocks without penalty. Attackers can serve a real block with a coinbase scriptSig rewritten to height 1, which keeps the ZIP-244 block hash, triggering a behind-tip drop before consensus validation and delaying tip discovery for mining backends.

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