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CVE-2021-38195

Date: August 8, 2021

An issue was discovered in the libsecp256k1 crate before 0.5.0 for Rust. It can verify an invalid signature because it allows the R or S parameter to be larger than the curve order, aka an overflow. Converted from WS-2021-0182, on 2021-08-09.

Language: RUST

Severity Score

Related Resources (7)

https://github.com/paritytech/libsecp256k1
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/libsecp256k1/RUSTSEC-2021-0076.md
https://rustsec.org/advisories/RUSTSEC-2021-0076.html
https://github.com/paritytech/libsecp256k1/pull/67
https://crates.io/crates/libsecp256k1
https://nvd.nist.gov/vuln/detail/CVE-2021-38195
https://www.mend.io/vulnerability-database/CVE-2021-38195

Severity Score

Weakness Type (CWE)

Improper Verification of Cryptographic Signature

CWE-347

Integer Overflow or Wraparound

CWE-190

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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