CVE-2020-15091

Public Exploit
Denial of Service in TenderMint

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.15%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: tendermint tendermint
Published at:
Updated at:

References

Link Tags
https://github.com/tendermint/tendermint/security/advisories/GHSA-6jqj-f58p-mrw3 third party advisory exploit
https://github.com/tendermint/tendermint/issues/4926 third party advisory issue tracking exploit
https://github.com/tendermint/tendermint/commit/480b995a31727593f58b361af979054d17d84340 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2020-15091?
CVE-2020-15091 has been scored as a medium severity vulnerability.
How to fix CVE-2020-15091?
To fix CVE-2020-15091, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-15091 being actively exploited in the wild?
It is possible that CVE-2020-15091 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-15091?
CVE-2020-15091 affects tendermint tendermint.
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