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Advisories

Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate

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severity
medium
date
Affecting

  • zebra >= 0, < 6.1.0

CWE
  • CWE-131 Incorrect Calculation of Buffer Size
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
ebfull, upbqdn
Description
Zebra before 6.1.0 contains an incorrect calculation vulnerability in its ZIP-317 block template selector that omits header and transaction-count size from the block budget. Attackers can place valid selectable transactions in a victim miner's mempool to shape templates into oversized blocks, causing rejection and wasted proof-of-work.

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