PT-2021-22003 · Unknown · Libsecp256K1

Published 2021-07-13 · Updated 2021-08-25 · CVE-2021-38195

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: libsecp256k1 versions prior to 0.5.0

Description: An issue in the libsecp256k1 crate allows it to verify invalid signatures. This occurs because the crate permits the R or S parameter to be larger than the secp256k1 curve order, resulting in an overflow. The issue differs from other implementations, which do not accept such signatures.

Recommendations: For versions prior to 0.5.0, update to version 0.5.0 or later, which includes a check overflow flag to resolve the issue.

Exploit

Fix

Integer Overflow

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-190

CWE-347

Related Identifiers

CVE-2021-38195

GHSA-G4VJ-X7V9-H82M

RUSTSEC-2021-0076

Affected Products

Libsecp256K1

References · 9

• 🔥 https://rustsec.org/advisories/RUSTSEC-2021-0076.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-38195 · Security Note
• https://osv.dev/vulnerability/GHSA-g4vj-x7v9-h82m · Vendor Advisory
• https://osv.dev/vulnerability/RUSTSEC-2021-0076 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-38195 · Vendor Advisory
• https://github.com/paritytech/libsecp256k1 · Note
• https://github.com/paritytech/libsecp256k1/pull/67 · Note
• https://crates.io/crates/libsecp256k1 · Note
• https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.md · Note