ubuntu-cve-2023-28531
Vulnerability from osv_ubuntu
Published
2023-03-17 04:15
Modified
2025-09-08 16:56
Summary
Details

ssh-add in OpenSSH before 9.3 adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The earliest affected version is 8.9.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openssh-client",
            "binary_version": "1:8.9p1-3ubuntu0.5"
          },
          {
            "binary_name": "openssh-server",
            "binary_version": "1:8.9p1-3ubuntu0.5"
          },
          {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:8.9p1-3ubuntu0.5"
          },
          {
            "binary_name": "openssh-tests",
            "binary_version": "1:8.9p1-3ubuntu0.5"
          },
          {
            "binary_name": "ssh",
            "binary_version": "1:8.9p1-3ubuntu0.5"
          },
          {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:8.9p1-3ubuntu0.5"
          }
        ],
        "priority_reason": "Only affects configurations using agent forwarding, smartcard keys, and per-hop destination constraints. Policy bypass only."
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu0.5?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:8.9p1-3ubuntu0.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:8.4p1-6ubuntu2",
        "1:8.7p1-2",
        "1:8.7p1-2build1",
        "1:8.7p1-4",
        "1:8.8p1-1",
        "1:8.9p1-3",
        "1:8.9p1-3ubuntu0.1",
        "1:8.9p1-3ubuntu0.3",
        "1:8.9p1-3ubuntu0.4"
      ]
    }
  ],
  "aliases": [],
  "details": "ssh-add in OpenSSH before 9.3 adds smartcard keys to ssh-agent without the intended per-hop destination constraints. The earliest affected version is 8.9.",
  "id": "UBUNTU-CVE-2023-28531",
  "modified": "2025-09-08T16:56:13Z",
  "published": "2023-03-17T04:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-28531"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2023/03/15/8"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6560-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-28531"
    }
  ],
  "related": [
    "USN-6560-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-28531"
  ]
}



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