Security advisory

{
  "id": "291ea4a79b0a0ce2abf690ea5394af0d36b9e6ed3a912e257b1c92c79bc1b861",
  "url": "https://osv.dev/vulnerability/CVE-2018-12520",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-12520",
    "summary": "An issue was discovered in ntopng 3.4 before 3.4.180617. The PRNG involved in the generation of session IDs is not seeded at program startup. This results in deterministic session IDs being allocated for active user sessions. An attacker with foreknowledge of the operating system and standard library in use by the host running the service and the username of the user whose session they're targeting can abuse the deterministic random number generation in order to hijack the user's session, thus escalating their access.",
    "evidence": "osv:CVE-2018-12520",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2018-12520",
      "aliases": [
        "CVE-2018-12520"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ntop/ntopng",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "30610bda60cbfc058f90a1c0a17d0e8f4516221a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "30610bda60cbfc058f90a1c0a17d0e8f4516221a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.0",
            "2.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-12520.json",
            "vanir_signatures": [
              {
                "id": "CVE-2018-12520-8f92f2be",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "202271442157234930294765738479679829812",
                    "267773852443207195048138629058386591051",
                    "244806091101993796754636223602039024143",
                    "252123222992940558900645095617835342826"
                  ]
                },
                "source": "https://github.com/ntop/ntopng/commit/30610bda60cbfc058f90a1c0a17d0e8f4516221a",
                "target": {
                  "file": "src/HTTPserver.cpp"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2018-12520-ad17fef2",
                "digest": {
                  "length": 4616,
                  "function_hash": "310015154338695952565071966124001018796"
                },
                "source": "https://github.com/ntop/ntopng/commit/30610bda60cbfc058f90a1c0a17d0e8f4516221a",
                "target": {
                  "file": "src/HTTPserver.cpp",
                  "function": "HTTPserver::HTTPserver"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:26:57Z"
          }
        }
      ],
      "modified": "2026-10-20T13:26:57.230365323Z",
      "provider": "osv",
      "references": [
        "https://github.com/ntop/ntopng/commit/30610bda60cbfc058f90a1c0a17d0e8f4516221a",
        "https://gist.github.com/Psychotropos/3e8c047cada9b1fb716e6a014a428b7f",
        "https://www.exploit-db.com/exploits/44973/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:ntop:ntopng:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "ntop:ntopng",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.4"
                  },
                  {
                    "fixed": "3.4.180617"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.4"
                  },
                  {
                    "fixed": "3.4.180617"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-12520",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387695,
  "published_at": "2018-07-05T20:29:00.527+00:00"
}