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Advisories

Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocks

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severity
medium
date
Affecting

  • zebra >= 0, < 6.3.0

CWE
  • CWE-704 Incorrect Type Conversion or Cast
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
evan-forbes
Description
Zebra before 6.3.0 contains a protection mechanism failure that allows unauthenticated peers to evade misbehavior scoring by supplying invalid gossiped blocks. The inbound cleanup step wrongly downcasts RouterError to VerifyBlockError and discards the score, so attackers can repeatedly force block download and Equihash verification without being banned.

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