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FKIE_CVE-2026-19624

Vulnerability from fkie_nvd - Published: 2026-09-14 20:16 - Updated: 2026-09-14 20:16
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).
References
patrick@puiterwijk.orghttps://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp
patrick@puiterwijk.orghttps://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673
patrick@puiterwijk.orghttps://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c
patrick@puiterwijk.orghttps://github.com/nm-l2tp/NetworkManager-l2tp/releases
patrick@puiterwijk.orghttps://linnemanlabs.com/posts/nm-l2tp-newline-to-root/
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/nm-l2tp/NetworkManager-l2tp",
          "defaultStatus": "unaffected",
          "packageName": "NetworkManager-l2tp",
          "versions": [
            {
              "lessThan": "1.0.16",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.2.22",
              "status": "affected",
              "version": "1.2.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.8.10",
              "status": "affected",
              "version": "1.8.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.20.24",
              "status": "affected",
              "version": "1.20.0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.52.4",
              "status": "affected",
              "version": "1.52.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp",
          "defaultStatus": "unaffected",
          "packageName": "NetworkManager-l2tp",
          "product": "Fedora",
          "vendor": "Fedora",
          "versions": [
            {
              "lessThan": "1.52.4",
              "status": "affected",
              "version": "1.52.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp",
          "defaultStatus": "unaffected",
          "packageName": "NetworkManager-l2tp",
          "product": "Extra Packages for Enterprise Linux (EPEL)",
          "vendor": "Fedora",
          "versions": [
            {
              "lessThan": "1.20.24",
              "status": "affected",
              "version": "1.20.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "patrick@puiterwijk.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc)."
    }
  ],
  "id": "CVE-2026-19624",
  "lastModified": "2026-09-14T20:16:43.593",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "patrick@puiterwijk.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19624",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-14T19:43:22.928124Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-14T20:16:43.593",
  "references": [
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/releases"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/"
    }
  ],
  "sourceIdentifier": "patrick@puiterwijk.org",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-88"
        }
      ],
      "source": "patrick@puiterwijk.org",
      "type": "Secondary"
    }
  ]
}



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