Vulnerability Description
TenderMint from version 0.33.0 and before version 0.33.6 allows 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 chainID**). A malicious block proposer (even with a minimal amount of stake) can use this vulnerability to completely halt the network. This issue is fixed in Tendermint 0.33.6 which checks all the signatures are for the block with 2/3+ majority before creating a commit.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Tendermint | Tendermint | >= 0.33.0, < 0.33.6 |
Related Weaknesses (CWE)
References
- https://github.com/tendermint/tendermint/commit/480b995a31727593f58b361af979054dPatchThird Party Advisory
- https://github.com/tendermint/tendermint/issues/4926ExploitIssue TrackingThird Party Advisory
- https://github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3ExploitThird Party Advisory
- https://github.com/tendermint/tendermint/commit/480b995a31727593f58b361af979054dPatchThird Party Advisory
- https://github.com/tendermint/tendermint/issues/4926ExploitIssue TrackingThird Party Advisory
- https://github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3ExploitThird Party Advisory
FAQ
What is CVE-2020-15091?
CVE-2020-15091 is a vulnerability with a CVSS score of 6.5 (MEDIUM). TenderMint from version 0.33.0 and before version 0.33.6 allows block proposers to include signatures for the wrong block. This may happen naturally if you start a network, have it run for some time a...
How severe is CVE-2020-15091?
CVE-2020-15091 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-15091?
Check the references section above for vendor advisories and patch information. Affected products include: Tendermint Tendermint.