modules:
  - module: github.com/tendermint/tendermint
    versions:
      - introduced: 0.34.0
        fixed: 0.34.3
    vulnerable_at: 0.34.2
    packages:
      - package: github.com/tendermint/tendermint/evidence
        symbols:
          - Pool.Update
          - Pool.CheckEvidence
      - package: github.com/tendermint/tendermint/consensus
        symbols:
          - State.tryAddVote
        derived_symbols:
          - BaseWAL.OnStart
          - Handshaker.Handshake
          - Handshaker.ReplayBlocks
          - Reactor.OnStart
          - Reactor.SwitchToConsensus
          - RunReplayFile
          - State.OnStart
          - State.OpenWAL
          - State.ReplayFile
          - WALGenerateNBlocks
          - WALWithNBlocks
description: |
    Mishandling of timestamps during consensus process can cause a denial of service.

    While reaching consensus, different tendermint nodes can observe a different
    timestamp for a consensus evidence. This mismatch can cause the evidence to be
    invalid, upon which the node producing the evidence will be asked to generate
    a new evidence. This new evidence will be the same, which means it will again
    be rejected by other nodes involved in the consensus. This loop will continue
    until the peer nodes decide to disconnect from the node producing the evidence.
cves:
  - CVE-2021-21271
ghsas:
  - GHSA-p658-8693-mhvg
credit: cmwaters (Github)
references:
  - advisory: https://github.com/tendermint/tendermint/security/advisories/GHSA-p658-8693-mhvg
  - article: https://github.com/tendermint/tendermint/blob/v0.34.3/CHANGELOG.md#v0.34.3
  - fix: https://github.com/tendermint/tendermint/commit/a2a6852ab99e4a0f9e79f0ea8c1726e262e25c76