Wiz
Vulnerability DatabaseCVE-2023-28531

CVE-2023-28531: 
NixOS vulnerability analysis and mitigation

Overview

OpenSSH versions before 9.3 contain a vulnerability (CVE-2023-28531) where ssh-add adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The vulnerability affects versions from 8.9 to versions prior to 9.3, and was discovered in March 2023 (OpenWall List).

Technical details

The vulnerability stems from a logic error that prevented constraints from being communicated to the ssh-agent when adding smartcard keys with per-hop destination constraints. This issue specifically affects the ssh-add functionality when used with smartcard keys and per-hop destination constraints. The vulnerability has been assigned a CVSS v3.1 base score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (NVD).

Impact

When exploited, this vulnerability could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). The common cases of non-smartcard keys and keys without destination constraints are unaffected (NetApp Advisory).

Mitigation and workarounds

The vulnerability has been fixed in OpenSSH version 9.3. Users are advised to upgrade to this version or later to address the security issue. Multiple vendors have released patches for their respective products, including Debian (version 1:8.4p1-5+deb11u3 for bullseye and 1:9.2p1-2+deb12u2 for bookworm) (Debian Security) and other affected distributions.

Additional resources

Source: This report was generated using AI

Free Vulnerability Assessment

Benchmark your Cloud Security Posture

Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.

Request assessment

Additional Wiz resources

Cloud Vulnerability DB

Cloud Vulnerability DB

An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues

Cloud threat landscape

Cloud threat landscape

A comprehensive threat intelligence database of cloud security incidents, actors, tools and techniques

PEACH

PEACH

A step-by-step framework for modeling and improving SaaS and PaaS tenant isolation

Get a personalized demo

Ready to see Wiz in action?

“Best User Experience I have ever seen, provides full visibility to cloud workloads.”
David EstlickCISO
“Wiz provides a single pane of glass to see what is going on in our cloud environments.”
Adam FletcherChief Security Officer
“We know that if Wiz identifies something as critical, it actually is.”
Greg PoniatowskiHead of Threat and Vulnerability Management
Get a demo