CVE-2023-45129 (GCVE-0-2023-45129)

Vulnerability from cvelistv5 – Published: 2023-10-10 17:17 – Updated: 2025-02-13 17:13
VLAI
Title
matrix-synapse vulnerable to denial of service due to malicious server ACL events
Summary
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.
Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7760 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
matrix-org synapse Affected: < 1.94.0
guessed Create a notification for this product.
Show details on NVD website
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            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Release Notes"
            ],
            "url": "https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://security.gentoo.org/glsa/202401-12"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-770"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-770"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-06-26T09:30:03+00:00",
      "cve": "CVE-2023-45129",
      "id": "CVE-2023-45129",
      "initial_release_date": "2023-10-10T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "synapse: malicious ACL event can cause denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-45129.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2025-03-15T06:08:21Z",
      "cve": "CVE-2023-45129",
      "id": "CVE-2023-45129",
      "initial_release_date": "2023-10-12T14:35:15Z",
      "product_status:recommended": "1",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-45129",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-45129.json",
      "version": "7"
    }
  }
}



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