{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-6936"
      ],
      "details": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\n",
      "id": "GSD-2023-6936",
      "modified": "2023-12-19T06:01:18.059345Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "facts@wolfssl.com",
        "ID": "CVE-2023-6936",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "wolfSSL",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "0",
                          "version_value": "5.6.5"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "wolfSSL"
            }
          ]
        }
      },
      "configuration": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:\u003cbr\u003e\u003cb\u003e\u003cspan style=\"background-color: transparent;\"\u003eCFLAGS=\"-DWOLFSSL_CALLBACKS\"\u003c/span\u003e\u003c/b\u003e\u003cbr\u003e\u003cbr\u003eThis option is disabled by default. The default configuration of wolfSSL is not vulnerable."
            }
          ],
          "value": "To be vulnerable, wolfSSL callback functionality (which includes handshake and timeout callback functionality) must must be enabled with:\nCFLAGS=\"-DWOLFSSL_CALLBACKS\"\n\nThis option is disabled by default. The default configuration of wolfSSL is not vulnerable."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Lucca Hirschi (Inria, LORIA)"
        },
        {
          "lang": "en",
          "value": "Steve Kremer (Inria, LORIA)"
        },
        {
          "lang": "en",
          "value": "Max Ammann (Trail of Bits)"
        },
        {
          "lang": "en",
          "value": "tlspuffin"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\n"
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.1.0-dev"
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/wolfSSL/wolfssl/pull/6949/",
            "refsource": "MISC",
            "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
          },
          {
            "name": "https://www.wolfssl.com/docs/security-vulnerabilities/",
            "refsource": "MISC",
            "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
          }
        ]
      },
      "solution": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003e\u003cspan style=\"background-color: transparent;\"\u003eThe fix for this issue is located in the following GitHub Pull Request: \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/wolfSSL/wolfssl/pull/6949/\"\u003ehttps://github.com/wolfSSL/wolfssl/pull/6949/\u003c/a\u003e\u003c/p\u003e"
            }
          ],
          "value": "The fix for this issue is located in the following GitHub Pull Request:  https://github.com/wolfSSL/wolfssl/pull/6949/ https://github.com/wolfSSL/wolfssl/pull/6949/ \n\n"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "work_around": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cli\u003eDo not build wolfSSL with \u003cb\u003eWOLFSSL_CALLBACKS\u003c/b\u003e defined\u003c/li\u003e"
            }
          ],
          "value": "  *  Do not build wolfSSL with WOLFSSL_CALLBACKS defined\n"
        }
      ]
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).\n"
          },
          {
            "lang": "es",
            "value": "En wolfSSL anterior a 5.6.6, si las funciones de devoluci\u00f3n de llamada est\u00e1n habilitadas (a trav\u00e9s del indicador WOLFSSL_CALLBACKS), entonces un cliente TLS malicioso o un atacante de red puede desencadenar una sobrelectura del b\u00fafer en el mont\u00f3n de 5 bytes (WOLFSSL_CALLBACKS solo est\u00e1 destinado a la depuraci\u00f3n)."
          }
        ],
        "id": "CVE-2023-6936",
        "lastModified": "2024-02-22T19:07:37.840",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "facts@wolfssl.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2024-02-20T22:15:08.197",
        "references": [
          {
            "source": "facts@wolfssl.com",
            "url": "https://github.com/wolfSSL/wolfssl/pull/6949/"
          },
          {
            "source": "facts@wolfssl.com",
            "url": "https://www.wolfssl.com/docs/security-vulnerabilities/"
          }
        ],
        "sourceIdentifier": "facts@wolfssl.com",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}