VulnerabilityModified
CVE-2021-43568
The verify function in the Stark Bank Elixir ECDSA library (ecdsa-elixir) 1.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
CRITICAL 9.8EPSS 1.05%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.05%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The verify function in the Stark Bank Elixir ECDSA library (ecdsa-elixir) 1.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.05% probability · 63th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- starkbank/elixir ecdsa
- Source
- cve@mitre.org
References
- https://github.com/starkbank/ecdsa-elixir/releases/tag/v1.0.1Third Party Advisory
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/Exploit, Third Party Advisory
- https://github.com/starkbank/ecdsa-elixir/releases/tag/v1.0.1Third Party Advisory
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.