Security advisory

{
  "id": "b8cd8952c1184942b6dfbc85c6b25acdcf130c4384758c4ba77aa6a89db31eba",
  "url": "https://osv.dev/vulnerability/CVE-2025-27591",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-27591",
    "summary": "A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at /var/log/below. This could have allowed local unprivileged users to escalate to root privileges through symlink attacks that manipulate files such as /etc/shadow.",
    "evidence": "osv:CVE-2025-27591",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-27591",
      "aliases": [
        "CVE-2025-27591",
        "GHSA-9mc5-7qhg-fp3w",
        "RUSTSEC-2025-0149"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/facebookincubator/below",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "da9382e6e3e332fd2c3195e22f34977f83f0f1f3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.0.0"
                      },
                      {
                        "fixed": "0.9.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "da9382e6e3e332fd2c3195e22f34977f83f0f1f3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "cpe": "cpe:2.3:a:facebook:below:*:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8.1",
            "v0.8.0",
            "v0.7.1",
            "v0.7.0",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.0",
            "v0.4.1",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-27591.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.446437608Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27591.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-27591",
        "https://www.facebook.com/security/advisories/cve-2025-27591",
        "https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3"
      ],
      "provider_metadata": {
        "cna_assigner": "facebook",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27591.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-27591",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492871,
  "published_at": "2025-03-11T18:29:21.569+00:00"
}