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Advisories

Zebra before 6.2.1 Block Download Denial of Service via KnownBlock SentHashes Lockout

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severity
medium
date
Affecting

  • zebra >= 0, < 6.2.1

CWE
  • CWE-459 Incomplete Cleanup
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
Description
Zebra before 6.2.1 contains an incomplete cleanup vulnerability that allows unauthenticated peers to block downloading of valid blocks by leaving rejected hashes in SentHashes. Attackers can send a contextually invalid block sharing an honest block's header hash, causing Request::KnownBlock to skip the honest block and keep nodes behind the tip.

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