Vulnerability-Lookup

FKIE_CVE-2018-15836

Vulnerability from fkie_nvd - Published: 2018-09-26 21:29 - Updated: 2026-06-17 01:43

Severity

7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used.

References

URL	Tags
cve@mitre.org	https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51	Patch, Vendor Advisory
cve@mitre.org	https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d	Patch, Vendor Advisory
cve@mitre.org	https://lists.openswan.org/pipermail/users/2018-August/023761.html	Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.openswan.org/pipermail/users/2018-August/023761.html	Release Notes, Vendor Advisory

Impacted products

	Vendor	Product	Version
	xelerance	openswan	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:xelerance:openswan:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "32D061AF-9BDF-481D-859E-5700E186FA15",
              "versionEndExcluding": "2.6.50.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used."
    },
    {
      "lang": "es",
      "value": "En Openswan en versiones anteriores a la 2.6.50.1, la verificaci\u00f3n de firmas IKEv2 es vulnerable a \"variantes de ataques de bajo exponente de Bleichenbacher en firmas RSA PKCS#1\" cuando se emplean claves RSA RAW."
    }
  ],
  "id": "CVE-2018-15836",
  "lastModified": "2026-06-17T01:43:10.620",
  "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
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2018-09-26T21:29:00.913",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "url": "https://lists.openswan.org/pipermail/users/2018-August/023761.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "url": "https://lists.openswan.org/pipermail/users/2018-August/023761.html"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2018-15836 (GCVE-0-2018-15836)

Vulnerability from cvelistv5 – Published: 2018-09-26 21:00 – Updated: 2024-08-05 10:01

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

3 references

URL	Tags
https://lists.openswan.org/pipermail/users/2018-A…	mailing-listx_refsource_MLIST
https://github.com/xelerance/Openswan/commit/9eaa…	x_refsource_CONFIRM
https://github.com/xelerance/Openswan/commit/0b46…	x_refsource_CONFIRM

Date Public

2018-08-24 00:00

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2024-08-05T10:01:54.675Z",
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        },
        "references": [
          {
            "name": "[openswan-users] 20180824 Xelerance has released Openswan 2.6.50.1",
            "tags": [
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              "x_refsource_MLIST",
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            ],
            "url": "https://lists.openswan.org/pipermail/users/2018-August/023761.html"
          },
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            ],
            "url": "https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
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            ],
            "url": "https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
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      "datePublic": "2018-08-24T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
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      "providerMetadata": {
        "dateUpdated": "2018-09-28T19:57:01.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
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          "name": "[openswan-users] 20180824 Xelerance has released Openswan 2.6.50.1",
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          ],
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          "url": "https://github.com/xelerance/Openswan/commit/0b460be9e287fd335c8ce58129c67bf06065ef51"
        }
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      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2018-15836",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
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                      }
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.