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Advisories

Zebra 4.5.0 before 7.0.0 Honest Peer Ban via Mempool Lock-Time Scoring

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Severity
medium
Date
Affecting

  • zebra >= 4.5.0, < 7.0.0

CWE
  • CWE-693 Protection Mechanism Failure
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
SphereDonout, conradoplg, mpguerra
Description
ZcashFoundation Zebra from 4.5.0 before 7.0.0 contains a protection mechanism failure that bans honest peers by scoring mempool lock-time rejections at the ban threshold. Attackers can broadcast transactions locked until the current height right after each block, causing lagging nodes to ban honest relaying peers for 24 hours or until restart.

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