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Advisories

Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling

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severity
high
date
Affecting

  • zebra >= 0, < 4.4.0

CWE
  • CWE-347 Improper Verification of Cryptographic Signature
CVSS
8.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
sangsoo-osec, defuse, mpguerra, upbqdn
Description
Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, computing a ZIP-244 digest for SIGHASH_SINGLE inputs lacking corresponding outputs instead of failing. Attackers can craft V5 transactions with fewer outputs than inputs that Zebra accepts and templates via getblocktemplate, producing blocks zcashd rejects.

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