{
  "GSD": {
    "alias": "CVE-2023-4039",
    "id": "GSD-2023-4039"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-4039"
      ],
      "details": "\n\nA failure in the -fstack-protector feature in GCC-based toolchains \nthat target AArch64 allows an attacker to exploit an existing buffer \noverflow in dynamically-sized local variables in your application \nwithout this being detected. This stack-protector failure only applies \nto C99-style dynamically-sized local variables or those created using \nalloca(). The stack-protector operates as intended for statically-sized \nlocal variables.\n\nThe default behavior when the stack-protector \ndetects an overflow is to terminate your application, resulting in \ncontrolled loss of availability. An attacker who can exploit a buffer \noverflow without triggering the stack-protector might be able to change \nprogram flow control to cause an uncontrolled loss of availability or to\n go further and affect confidentiality or integrity.\n\n\n\n\n\n",
      "id": "GSD-2023-4039",
      "modified": "2023-12-13T01:20:27.430843Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "arm-security@arm.com",
        "ID": "CVE-2023-4039",
        "STATE": "PUBLIC"
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                    "product_name": "Arm GNU Toolchain",
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                          "version_value": "not down converted",
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                            "defaultStatus": "affected",
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                                "status": "affected",
                                "version": "All versions where option -fstack-protector is used"
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              "vendor_name": "Arm Ltd"
            },
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              "product": {
                "product_data": [
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                    "product_name": "GCC",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "All versions of GCC that target AArch64 when option -fstack-protector is used"
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                    }
                  }
                ]
              },
              "vendor_name": "GNU"
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              "value": "\nThe specific conditions where the stack-protector fails to give the desired level of protection are when:\n\n\n\u003cul\u003e\n    \u003cli\u003eusing GCC (all unpatched versions) targeting AArch64\u003c/li\u003e\n    \u003cli\u003eand when the -fstack-protector option is used\u003c/li\u003e\n    \u003cli\u003eand when the program uses C99-style dynamically-sized local variables or alloca()\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eAnd to be exploitable there must also be a prior vulnerability in the\n program such that an attacker can cause a buffer overflow in these \nlocal variables that overwrites saved register values in the stack.\u003c/p\u003e\n\n\u003cbr\u003e"
            }
          ],
          "value": "The specific conditions where the stack-protector fails to give the desired level of protection are when:\n\n\n\n      *  using GCC (all unpatched versions) targeting AArch64\n\n      *  and when the -fstack-protector option is used\n\n      *  and when the program uses C99-style dynamically-sized local variables or alloca()\n\n\n\n\nAnd to be exploitable there must also be a prior vulnerability in the\n program such that an attacker can cause a buffer overflow in these \nlocal variables that overwrites saved register values in the stack.\n\n\n\n\n"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Tom Hebb from Meta Red Team X and Maria Markstedter from Azeria Labs"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "\n\n**DISPUTED**A failure in the -fstack-protector feature in GCC-based toolchains \nthat target AArch64 allows an attacker to exploit an existing buffer \noverflow in dynamically-sized local variables in your application \nwithout this being detected. This stack-protector failure only applies \nto C99-style dynamically-sized local variables or those created using \nalloca(). The stack-protector operates as intended for statically-sized \nlocal variables.\n\nThe default behavior when the stack-protector \ndetects an overflow is to terminate your application, resulting in \ncontrolled loss of availability. An attacker who can exploit a buffer \noverflow without triggering the stack-protector might be able to change \nprogram flow control to cause an uncontrolled loss of availability or to\n go further and affect confidentiality or integrity. NOTE: The GCC project argues that this is a missed hardening bug and not a vulnerability by itself.\n\n\n\n\n\n"
          }
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        "cvss": [
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
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        "problemtype_data": [
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            "description": [
              {
                "cweId": "CWE-693",
                "lang": "eng",
                "value": "CWE-693 Protection Mechanism Failure"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vulnerability%20AArch64",
            "refsource": "MISC",
            "url": "https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vulnerability%20AArch64"
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          {
            "name": "https://github.com/metaredteam/external-disclosures/security/advisories/GHSA-x7ch-h5rf-w2mf",
            "refsource": "MISC",
            "url": "https://github.com/metaredteam/external-disclosures/security/advisories/GHSA-x7ch-h5rf-w2mf"
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              "value": "\nRecompile vulnerable code using an updated toolchain.\n\n\u003cbr\u003e"
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      "source": {
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
      "cve": {
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                    "criteria": "cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:arm64:*",
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        "descriptions": [
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            "lang": "en",
            "value": "\n\n**DISPUTED**A failure in the -fstack-protector feature in GCC-based toolchains \nthat target AArch64 allows an attacker to exploit an existing buffer \noverflow in dynamically-sized local variables in your application \nwithout this being detected. This stack-protector failure only applies \nto C99-style dynamically-sized local variables or those created using \nalloca(). The stack-protector operates as intended for statically-sized \nlocal variables.\n\nThe default behavior when the stack-protector \ndetects an overflow is to terminate your application, resulting in \ncontrolled loss of availability. An attacker who can exploit a buffer \noverflow without triggering the stack-protector might be able to change \nprogram flow control to cause an uncontrolled loss of availability or to\n go further and affect confidentiality or integrity. NOTE: The GCC project argues that this is a missed hardening bug and not a vulnerability by itself.\n\n\n\n\n\n"
          },
          {
            "lang": "es",
            "value": "Una falla en la funci\u00f3n -fstack-protector en cadenas de herramientas basadas en GCC que apuntan a AArch64 permite a un atacante explotar un Desbordamiento de B\u00fafer existente en variables locales de tama\u00f1o din\u00e1mico en su aplicaci\u00f3n sin que esto sea detectado. Esta falla del protector de pila solo se aplica a variables locales de tama\u00f1o din\u00e1mico estilo C99 o aquellas creadas usando alloca(). El protector de pila funciona seg\u00fan lo previsto para variables locales de tama\u00f1o est\u00e1tico. El comportamiento predeterminado cuando el protector de pila detecta un desbordamiento es finalizar su aplicaci\u00f3n, lo que resulta en una p\u00e9rdida controlada de disponibilidad. Un atacante que pueda aprovechar un Desbordamiento del B\u00fafer sin activar el protector de pila podr\u00eda cambiar el control de flujo del programa para provocar una p\u00e9rdida incontrolada de disponibilidad o ir m\u00e1s all\u00e1 y afectar la confidencialidad o la integridad."
          }
        ],
        "id": "CVE-2023-4039",
        "lastModified": "2024-02-19T23:15:07.680",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
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                "baseScore": 4.8,
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              "exploitabilityScore": 2.2,
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              "source": "arm-security@arm.com",
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        "published": "2023-09-13T09:15:15.690",
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            "source": "arm-security@arm.com",
            "tags": [
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              "Patch",
              "Third Party Advisory"
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            "url": "https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vulnerability%20AArch64"
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        "vulnStatus": "Modified",
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}