{
    "CVE_data_meta": {
        "ASSIGNER": "security@ubuntu.com",
        "DATE_PUBLIC": "2020-07-29T17:00:00.000Z",
        "ID": "CVE-2020-15706",
        "STATE": "PUBLIC",
        "TITLE": "GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing."
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "grub2 in Ubuntu",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "20.04 LTS",
                                            "version_value": "2.04-1ubuntu26.1"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "18.04 LTS",
                                            "version_value": "2.02-2ubuntu8.16"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "16.04 LTS",
                                            "version_value": "2.02~beta2-36ubuntu3.26"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "14.04 ESM",
                                            "version_value": "2.02~beta2-9ubuntu1.20"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Ubuntu"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Chris Coulson"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions."
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-362 Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/",
                "refsource": "CONFIRM",
                "url": "https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/"
            },
            {
                "name": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass",
                "refsource": "UBUNTU",
                "url": "https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass"
            },
            {
                "name": "http://ubuntu.com/security/notices/USN-4432-1",
                "refsource": "UBUNTU",
                "url": "http://ubuntu.com/security/notices/USN-4432-1"
            },
            {
                "name": "https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot",
                "refsource": "DEBIAN",
                "url": "https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot"
            },
            {
                "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011",
                "refsource": "CONFIRM",
                "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011"
            },
            {
                "name": "https://access.redhat.com/security/vulnerabilities/grub2bootloader",
                "refsource": "REDHAT",
                "url": "https://access.redhat.com/security/vulnerabilities/grub2bootloader"
            },
            {
                "name": "https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/",
                "refsource": "SUSE",
                "url": "https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/"
            },
            {
                "name": "https://www.suse.com/support/kb/doc/?id=000019673",
                "refsource": "SUSE",
                "url": "https://www.suse.com/support/kb/doc/?id=000019673"
            },
            {
                "name": "https://www.openwall.com/lists/oss-security/2020/07/29/3",
                "refsource": "CONFIRM",
                "url": "https://www.openwall.com/lists/oss-security/2020/07/29/3"
            },
            {
                "name": "https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html",
                "refsource": "CONFIRM",
                "url": "https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html"
            },
            {
                "refsource": "DEBIAN",
                "name": "DSA-4735",
                "url": "https://www.debian.org/security/2020/dsa-4735"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities",
                "url": "http://www.openwall.com/lists/oss-security/2020/07/29/3"
            },
            {
                "refsource": "CONFIRM",
                "name": "https://security.netapp.com/advisory/ntap-20200731-0008/",
                "url": "https://security.netapp.com/advisory/ntap-20200731-0008/"
            },
            {
                "refsource": "UBUNTU",
                "name": "USN-4432-1",
                "url": "https://usn.ubuntu.com/4432-1/"
            },
            {
                "refsource": "SUSE",
                "name": "openSUSE-SU-2020:1169",
                "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html"
            },
            {
                "refsource": "SUSE",
                "name": "openSUSE-SU-2020:1168",
                "url": "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html"
            }
        ]
    },
    "source": {
        "advisory": "USN 4432-1",
        "discovery": "INTERNAL"
    }
}