FKIE_CVE-2018-16151

Vulnerability from fkie_nvd - Published: 2018-09-26 21:29 - Updated: 2026-06-17 01:43
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.
References
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2018/09/msg00032.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/201811-16Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3771-1/Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2018/dsa-4305Third Party Advisory
cve@mitre.orghttps://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2018/09/msg00032.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/201811-16Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3771-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2018/dsa-4305Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html
Impacted products
Vendor Product Version
strongswan strongswan *
strongswan strongswan *
debian debian_linux 8.0
debian debian_linux 9.0
canonical ubuntu_linux 14.04
canonical ubuntu_linux 16.04
canonical ubuntu_linux 18.04
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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      ],
      "source": "cve@mitre.org"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication."
    },
    {
      "lang": "es",
      "value": "En verify_emsa_pkcs1_signature() en gmp_rsa_public_key.c en el plugin gmp en strongSwan en versiones 4.x y 5.x anteriores a la 5.7.0, la implementaci\u00f3n RSA basada en GMP no rechaza los datos sobrantes tras el algoritmo OID cifrado durante la verificaci\u00f3n de firmas PKCS#1 v1.5. De forma similar al error en la misma versi\u00f3n de strongSwan relacionado con digestAlgorithm.parameters, un atacante remoto puede falsificar firmas cuando se emplean peque\u00f1os exponentes p\u00fablicos, lo que podr\u00eda conducir a una suplantaci\u00f3n cuando solo se emplea una firma RSA para la autenticaci\u00f3n IKEv2."
    }
  ],
  "id": "CVE-2018-16151",
  "lastModified": "2026-06-17T01:43:47.000",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
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    "cvssMetricV30": [
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          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.0"
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        "source": "nvd@nist.gov",
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          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
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    "ssvcV203": [
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        "ssvcData": {
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          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-12-03T20:25:18.608507Z",
          "version": "2.0.3"
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  },
  "published": "2018-09-26T21:29:01.087",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html"
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    {
      "source": "cve@mitre.org",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html"
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  "vulnStatus": "Modified",
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      "type": "Secondary"
    }
  ]
}



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