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Advisories

Zebra before 6.3.0 False Readiness via Discarded One-Hash FindBlocks Response

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severity
medium
date
Affecting

  • zebra >= 0, < 6.3.0

CWE
  • CWE-754 Improper Check for Unusual or Exceptional Conditions
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
Maakai123, oxarbitrage
Description
Zebra before 6.3.0 contains an improper exceptional condition check in ChainSync::obtain_tips that discards valid one-hash FindBlocks responses, falsely reporting close-to-tip status. Peers returning only the next block hash cause a zero-length sync sample, making the /ready endpoint return 200 OK while the node remains behind the tip.

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