Zincati allows unprivileged access to rpm-ostree D-Bus `Deploy()` and `FinalizeDeployment()` methods

{
  "id": "99ae7668e930d113249eaeaa48797ac83bad88e732802ebfa3c1d7c294bfd988",
  "url": "https://osv.dev/vulnerability/CVE-2025-27512",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Zincati allows unprivileged access to rpm-ostree D-Bus `Deploy()` and `FinalizeDeployment()` methods",
    "summary": "Zincati is an auto-update agent for Fedora CoreOS hosts. Zincati ships a polkit rule which allows the `zincati` system user to use the actions `org.projectatomic.rpmostree1.deploy` to deploy updates to the system and `org.projectatomic.rpmostree1.finalize-deployment` to reboot the system into the deployed update. Since Zincati v0.0.24, this polkit rule contains a logic error which broadens access of those polkit actions to any unprivileged user rather than just the `zincati` system user. In practice, this means that any unprivileged user with access to the system D-Bus socket is able to deploy older Fedora CoreOS versions (which may have other known vulnerabilities). Note that rpm-ostree enforces that the selected version must be from the same branch the system is currently on so this cannot directly be used to deploy an attacker-controlled update payload. This primarily impacts users running untrusted workloads with access to the system D-Bus socket. Note that in general, untrusted workloads should not be given this access, whether containerized or not. By default, containers do not have access to the system D-Bus socket. The logic error is fixed in Zincati v0.0.30. A workaround is to manually add a following polkit rule, instructions for which are available in the GitHub Security Advisory.",
    "evidence": "osv:CVE-2025-27512",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-27512",
      "aliases": [
        "CVE-2025-27512",
        "GHSA-w6fv-6gcc-x825"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/coreos/zincati",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7f805e064575e936034e2d3ef56589e537d30c06"
                },
                {
                  "fixed": "688021f140753bddde483a9e66203fa465a3623e"
                },
                {
                  "fixed": "01d8e89f799e6ba21bdf7dc668abce23bd0d8f78"
                },
                {
                  "fixed": "28a43aa2c1edda091ba659677d73c13e6e3ea99d"
                },
                {
                  "fixed": "7f805e064575e936034e2d3ef56589e537d30c06"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.0.24"
                      },
                      {
                        "fixed": "0.0.30"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "01d8e89f799e6ba21bdf7dc668abce23bd0d8f78"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "28a43aa2c1edda091ba659677d73c13e6e3ea99d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7f805e064575e936034e2d3ef56589e537d30c06"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.0.24"
                  },
                  {
                    "range": [
                      {
                        "fixed": "688021f140753bddde483a9e66203fa465a3623e"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.0.30"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-27512.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.996353211Z",
      "provider": "osv",
      "references": [
        "https://github.com/coreos/zincati/releases/tag/v0.0.24",
        "https://github.com/coreos/zincati/releases/tag/v0.0.30",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27512.json",
        "https://github.com/coreos/zincati/security/advisories/GHSA-w6fv-6gcc-x825",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-27512",
        "https://github.com/coreos/zincati/commit/01d8e89f799e6ba21bdf7dc668abce23bd0d8f78",
        "https://github.com/coreos/zincati/commit/28a43aa2c1edda091ba659677d73c13e6e3ea99d"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-783",
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27512.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-27512",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491434,
  "published_at": "2025-03-17T14:46:28.219+00:00"
}