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Advisories

Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output

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severity
high
date
Affecting

  • zebra >= 4.4.0, < 4.4.1

  • zebra >= 6.0.0, < 6.0.1

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, fivelittleducks
Description
Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inputs than outputs that Zebra accepts but zcashd rejects, causing a network consensus split.

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