QID 980443

QID 980443: Python (pip) Security Update for fastecdsa (GHSA-56wv-2wr9-3h9r)

An issue was discovered in fastecdsa before 2.1.2. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. This behavior is not solely a usability problem. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.

Successful exploitation of this vulnerability may affect the confidentiality, integrity, and availability of the targeted user.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Customers are advised to refer to GHSA-56wv-2wr9-3h9r for updates pertaining to this vulnerability.

Vendor References

GHSA-56wv-2wr9-3h9r - github.com/advisories/GHSA-56wv-2wr9-3h9r

CVEs related to QID 980443

CVE-2020-12607 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-56wv-2wr9-3h9r	fastecdsa		github.com/advisories/GHSA-56wv-2wr9-3h9r

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