CVE-2021-43568 — CRITICAL (9.8)

Vulnerability 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 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Starkbank	Elixir Ecdsa	1.0.0

Related Weaknesses (CWE)

CWE-347

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-ExploitThird 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-ExploitThird Party Advisory

FAQ

What is CVE-2021-43568?

CVE-2021-43568 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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.

How severe is CVE-2021-43568?

CVE-2021-43568 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-43568?

Check the references section above for vendor advisories and patch information. Affected products include: Starkbank Elixir Ecdsa.