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Vulnerability DatabaseCVE-2025-4658

CVE-2025-4658: 
Linux Debian vulnerability analysis and mitigation

Overview

CVE-2025-4658 affects the OpenPubkey library versions prior to 0.10.0 and OPKSSH versions prior to 0.5.0. The vulnerability was discovered and disclosed on May 13, 2025, by Cloudflare, Inc. The vulnerability allows a specially crafted JWS (JSON Web Signature) to bypass signature verification in the authentication process (NVD).

Technical details

The vulnerability is classified as an Authentication Bypass (CWE-305) with a CVSS 4.0 Base Score of 9.3 CRITICAL (Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L). The vulnerability exists in the signature verification mechanism of the OpenPubkey library, which is a critical component used by OPKSSH for authentication purposes (NVD).

Impact

The vulnerability allows attackers to bypass OPKSSH authentication entirely. Since OPKSSH is used for SSH access management with OpenID Connect identities, a successful exploit could lead to unauthorized access to systems using OPKSSH for authentication (NVD, OpenPubkey Github).

Mitigation and workarounds

Users should upgrade OpenPubkey library to version 0.10.0 or later, and OPKSSH to version 0.5.0 or later to address this vulnerability (NVD).

Additional resources

Source: This report was generated using AI

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