PT-2021-23876 · Stark Bank · Ecdsa-Node

Published 2021-11-09 · Updated 2021-11-12 · CVE-2021-43571

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Stark Bank Node.js ECDSA library (ecdsa-node) version 1.1.2

Description The verify function in the library fails to check that the signature is non-zero, allowing attackers to forge signatures on arbitrary messages.

Recommendations For version 1.1.2, update to a newer version that includes a fix for this issue, as the current version allows attackers to forge signatures due to the verify function's failure to check for non-zero signatures. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2021-43571

GHSA-Q9Q6-F556-GPM7

Affected Products

Ecdsa-Node

References · 7

• 🔥 https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries · Exploit
• https://osv.dev/vulnerability/CVE-2021-43571 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-q9q6-f556-gpm7 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-43571 · Security Note
• https://github.com/starkbank/ecdsa-node/releases/tag/v1.1.3 · Note
• https://github.com/starkbank/ecdsa-node · Note
• https://t.me/cibsecurity/32125 · Telegram Post