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Advisories

Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes

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severity
medium
date
Affecting

  • zebra >= 0, < 6.3.0

CWE
  • CWE-345 Insufficient Verification of Data Authenticity
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Credit
zakura-security
Description
Zebra (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a syncing node so that honest peers get banned, eroding its peer set and raising eclipse risk.

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