Vulnerability in github.com/tendermint/tendermint (CVE-2020-15091)
Summary
Vulnerability in github.com/tendermint/tendermint (CVE-2020-15091). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.33.6 or later.
Original description
The description as published by the source.
Description
Denial of Service
Tendermint 0.33.0 and above allow block proposers to include signatures for the wrong block. This may happen naturally if you start a network, have it run for some time and restart it without changing the chainID. (It is a misconfiguration to reuse chainIDs.) Correct block proposers will accidentally include signatures for the wrong block if they see these signatures, and then commits won't validate, making all proposed blocks invalid. A malicious validator (even with a minimal amount of stake) can use this vulnerability to completely halt the network.
Tendermint 0.33.6 checks all the signatures are for the block with +2/3 majority before creating a commit.
False Witness
Tendermint 0.33.1 and above are no longer fully verifying commit signatures during block execution - they stop after +2/3. This means proposers can propose blocks that contain valid +2/3 signatures and then the rest of the signatures can be whatever they want. They can claim that all the other validators signed just by including a CommitSig with arbitrary signature data. While this doesn't seem to impact safety of Tendermint per se, it means that Commits may contain a lot of invalid data **.
_** This was already true of blocks, since they could include invalid txs filled with garbage, but in that case the application knew that they are invalid and could punish the proposer. But since app…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2020-15091 has been found in github.com/tendermint/tendermint.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/tendermint/tendermint to 0.33.6 or later.
If unsure, ask your IT team or search "github.com/tendermint/tendermint CVE-2020-15091" on the vendor's site.
CVE-2020-15091 (github.com/tendermint/tendermint) — CWE-347
Attack vector: remote (network-reachable) / no user interaction
Patched: 0.33.6 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-347) exists in github.com/tendermint/tendermint.
Check the vendor advisory for the affected versions of github.com/tendermint/tendermint.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 0.33.6.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/tendermint/tendermint' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/tendermint/tendermint' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/tendermint/tendermintを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/tendermint/tendermint to 0.33.6ステージング環境で 0.33.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web pkg.go.dev