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Advisories

Zebra before 11.0.0 Denial of Service via getblock Verbosity 2

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severity
medium
date
Affecting

  • zebra >= 0, < 11.0.0

CWE
  • CWE-617 Reachable Assertion
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
mpguerra, defuse, oxarbitrage, upbqdn
Description
The getblock RPC method in zebra-rpc before 11.0.0, used by the Zcash Foundation's Zebra node, panics on verbosity 2 for a side-chain block because the block's -1 confirmations sentinel is converted to u32 with .expect(), aborting the process. Remote unauthenticated attackers, directly or through lightwalletd, can repeat this call to keep the node in a crash loop.

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