A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
{"osv": [{"lastseen": "2022-11-22T20:47:20", "description": "A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "cvss3": {}, "published": "2021-03-03T17:15:00", "type": "osv", "title": "CVE-2020-27749", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2020-27749"], "modified": "2022-11-22T20:47:18", "id": "OSV:CVE-2020-27749", "href": "https://osv.dev/vulnerability/CVE-2020-27749", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2023-06-28T06:52:19", "description": "\nSeveral vulnerabilities have been discovered in the GRUB2 bootloader.\n\n\n* [CVE-2020-14372](https://security-tracker.debian.org/tracker/CVE-2020-14372)\nIt was discovered that the acpi command allows a privileged user to\n load crafted ACPI tables when Secure Boot is enabled.\n* [CVE-2020-25632](https://security-tracker.debian.org/tracker/CVE-2020-25632)\nA use-after-free vulnerability was found in the rmmod command.\n* [CVE-2020-25647](https://security-tracker.debian.org/tracker/CVE-2020-25647)\nAn out-of-bound write vulnerability was found in the\n grub\\_usb\\_device\\_initialize() function, which is called to handle USB\n device initialization.\n* [CVE-2020-27749](https://security-tracker.debian.org/tracker/CVE-2020-27749)\nA stack buffer overflow flaw was found in grub\\_parser\\_split\\_cmdline.\n* [CVE-2020-27779](https://security-tracker.debian.org/tracker/CVE-2020-27779)\nIt was discovered that the cutmem command allows a privileged user\n to remove memory regions when Secure Boot is enabled.\n* [CVE-2021-20225](https://security-tracker.debian.org/tracker/CVE-2021-20225)\nA heap out-of-bounds write vulnerability was found in the short form\n option parser.\n* [CVE-2021-20233](https://security-tracker.debian.org/tracker/CVE-2021-20233)\nA heap out-of-bound write flaw was found caused by mis-calculation\n of space required for quoting in the menu rendering.\n\n\nFurther detailed information can be found at\n<https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot>\n\n\nFor the stable distribution (buster), these problems have been fixed in\nversion 2.02+dfsg1-20+deb10u4.\n\n\nWe recommend that you upgrade your grub2 packages.\n\n\nFor the detailed security status of grub2 please refer to its security\ntracker page at:\n<https://security-tracker.debian.org/tracker/grub2>\n\n\n", "cvss3": {"exploitabilityScore": 1.5, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 8.2, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 6.0}, "published": "2021-03-02T00:00:00", "type": "osv", "title": "grub2 - security update", "bulletinFamily": "software", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-14372", "CVE-2020-25632", "CVE-2020-25647", "CVE-2020-27749", "CVE-2020-27779", "CVE-2021-20225", "CVE-2021-20233"], "modified": "2023-06-28T06:51:14", "id": "OSV:DSA-4867-1", "href": "https://osv.dev/vulnerability/DSA-4867-1", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "veracode": [{"lastseen": "2023-04-18T06:55:11", "description": "grub2 is vulnerable to privilege escalation. The vulnerability exists as variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections.\n", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-03-03T05:51:57", "type": "veracode", "title": "Privilege Escalation", "bulletinFamily": "software", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2022-05-13T22:35:11", "id": "VERACODE:29550", "href": "https://sca.analysiscenter.veracode.com/vulnerability-database/security/1/1/sid-29550/summary", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "prion": [{"lastseen": "2023-11-22T01:33:56", "description": "A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "cvss3": {"cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}}, "published": "2021-03-03T17:15:00", "type": "prion", "title": "Design/Logic Flaw", "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 2.5, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 4.0, "vectorString": "AV:L/AC:L/Au:M/C:P/I:P/A:P", "version": "2.0", "accessVector": "LOCAL", "authentication": "MULTIPLE"}, "impactScore": 6.4, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2023-11-07T03:20:00", "id": "PRION:CVE-2020-27749", "href": "https://www.prio-n.com/kb/vulnerability/CVE-2020-27749", "cvss": {"score": 4.0, "vector": "AV:L/AC:L/Au:M/C:P/I:P/A:P"}}], "debiancve": [{"lastseen": "2023-12-02T18:25:19", "description": "A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-03-03T17:15:00", "type": "debiancve", "title": "CVE-2020-27749", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2021-03-03T17:15:00", "id": "DEBIANCVE:CVE-2020-27749", "href": "https://security-tracker.debian.org/tracker/CVE-2020-27749", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "cbl_mariner": [{"lastseen": "2023-12-02T20:18:22", "description": "CVE-2020-27749 affecting package grub2 2.06~rc1-7. A patched version of the package is available.", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2022-04-26T20:17:11", "type": "cbl_mariner", "title": "CVE-2020-27749 affecting package grub2 2.06~rc1-7", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2022-04-26T20:17:11", "id": "CBLMARINER:6463", "href": "", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-12-02T20:18:18", "description": "CVE-2020-27749 affecting package grub2 2.06~rc1-10. A patched version of the package is available.", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-05-06T23:56:52", "type": "cbl_mariner", "title": "CVE-2020-27749 affecting package grub2 2.06~rc1-10", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2021-05-06T23:56:52", "id": "CBLMARINER:3933", "href": "", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "ubuntucve": [{"lastseen": "2023-12-02T14:08:29", "description": "A flaw was found in grub2 in versions prior to 2.06. Variable names present\nare expanded in the supplied command line into their corresponding variable\ncontents, using a 1kB stack buffer for temporary storage, without\nsufficient bounds checking. If the function is called with a command line\nthat references a variable with a sufficiently large payload, it is\npossible to overflow the stack buffer, corrupt the stack frame and control\nexecution which could also circumvent Secure Boot protections. The highest\nthreat from this vulnerability is to data confidentiality and integrity as\nwell as system availability.\n\n#### Notes\n\nAuthor| Note \n---|--- \n[sbeattie](<https://launchpad.net/~sbeattie>) | grub2-unsigned will contain fixes and supersede grub2, which will contain only BIOS grub bits.\n", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-03-02T00:00:00", "type": "ubuntucve", "title": "CVE-2020-27749", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2021-03-02T00:00:00", "id": "UB:CVE-2020-27749", "href": "https://ubuntu.com/security/CVE-2020-27749", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "alpinelinux": [{"lastseen": "2023-12-02T17:25:17", "description": "A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-03-03T17:15:00", "type": "alpinelinux", "title": "CVE-2020-27749", "bulletinFamily": "unix", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2023-11-07T03:20:00", "id": "ALPINE:CVE-2020-27749", "href": "https://security.alpinelinux.org/vuln/CVE-2020-27749", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "redhatcve": [{"lastseen": "2023-12-02T17:38:19", "description": "A flaw was found in grub2. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.\n", "cvss3": {"exploitabilityScore": 0.8, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 6.7, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2021-03-02T18:33:49", "type": "redhatcve", "title": "CVE-2020-27749", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-27749"], "modified": "2023-07-24T13:43:13", "id": "RH:CVE-2020-27749", "href": "https://access.redhat.com/security/cve/cve-2020-27749", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-12-02T17:38:19", "description": "A flaw was found in GRUB 2, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.\n", "cvss3": {"exploitabilityScore": 1.5, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "CHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "baseScore": 8.2, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 6.0}, "published": "2021-03-02T18:03:04", "type": "redhatcve", "title": "CVE-2020-14372", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 7.2, "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-10713", "CVE-2020-14372", "CVE-2020-25632", "CVE-2020-25647", "CVE-2020-27749", "CVE-2020-27779", "CVE-2021-20225", "CVE-2021-20233"], "modified": "2023-11-16T17:15:27", "id": "RH:CVE-2020-14372", "href": "https://access.redhat.com/security/cve/cve-2020-14372", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "nessus": [{"lastseen": "2023-10-19T15:03:05", "description": "The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4992-1 advisory.\n\n - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability. (CVE-2020-14372)\n\n - A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-25632)\n\n - A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.\n (CVE-2020-27749)\n\n - A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-27779)\n\n - A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-20225)\n\n - A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. 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quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2021-20233)\n\n - A flaw was found in grub2 in versions prior to 2.06.\n The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2021-20225)\n\n - A flaw was found in grub2 in versions prior to 2.06.\n The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25632)\n\n - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.(CVE-2020-14372)\n\n - A flaw was found in grub2 in versions prior to 2.06.\n During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25647)\n\n - A flaw was found in grub2 in versions prior to 2.06.\n Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-27749)\n\n - A flaw was found in grub2 in versions prior to 2.06.\n The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-27779)\n\nNote that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. 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If the function is called with a command line that references a\n variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack\n frame and control execution which could also circumvent Secure Boot protections. The highest threat from\n this vulnerability is to data confidentiality and integrity as well as system availability.\n (CVE-2020-27749)\n\n - A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking\n allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent\n SecureBoot protections after proper triage about grub's memory layout. The highest threat from this\n vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-27779)\n\n - A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past\n the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms\n of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as\n system availability. (CVE-2021-20225)\n\n - A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs\n a length calculation on the assumption that expressing a quoted single quote will require 3 characters,\n while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each\n quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as\n well as system availability. (CVE-2021-20233)\n\nNote that Nessus has not tested for this issue but has instead relied only on the application's self-reported version\nnumber.\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1175970\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1176711\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1177883\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1179264\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1179265\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1182057\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1182262\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1182263\");\n script_set_attribute(attribute:\"see_also\", value:\"https://lists.suse.com/pipermail/sle-updates/2021-March/018162.html\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2017-9763\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2020-14372\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2020-25632\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2020-25647\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2020-27749\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2020-27779\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2021-20225\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2021-20233\");\n script_set_attribute(attribute:\"solution\", value:\n\"Update the affected grub2-x86_64-efi and / or grub2-x86_64-xen packages.\");\n script_set_cvss_base_vector(\"CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C\");\n script_set_cvss_temporal_vector(\"CVSS2#E:U/RL:OF/RC:C\");\n script_set_cvss3_base_vector(\"CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H\");\n script_set_cvss3_temporal_vector(\"CVSS:3.0/E:U/RL:O/RC:C\");\n script_set_attribute(attribute:\"cvss_score_source\", value:\"CVE-2021-20233\");\n\n script_set_attribute(attribute:\"exploitability_ease\", value:\"No known exploits are available\");\n script_set_attribute(attribute:\"exploit_available\", value:\"false\");\n\n script_set_attribute(attribute:\"vuln_publication_date\", value:\"2017/06/19\");\n script_set_attribute(attribute:\"patch_publication_date\", value:\"2021/03/02\");\n script_set_attribute(attribute:\"plugin_publication_date\", value:\"2021/06/10\");\n\n script_set_attribute(attribute:\"plugin_type\", value:\"local\");\n script_set_attribute(attribute:\"cpe\", value:\"p-cpe:/a:novell:suse_linux:grub2-x86_64-efi\");\n script_set_attribute(attribute:\"cpe\", value:\"p-cpe:/a:novell:suse_linux:grub2-x86_64-xen\");\n script_set_attribute(attribute:\"cpe\", value:\"cpe:/o:novell:suse_linux:11\");\n script_set_attribute(attribute:\"stig_severity\", value:\"II\");\n script_end_attributes();\n\n script_category(ACT_GATHER_INFO);\n script_family(english:\"SuSE Local Security Checks\");\n\n script_copyright(english:\"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.\");\n\n script_dependencies(\"ssh_get_info.nasl\");\n script_require_keys(\"Host/local_checks_enabled\", \"Host/cpu\", \"Host/SuSE/release\", \"Host/SuSE/rpm-list\");\n\n exit(0);\n}\n\n\ninclude('audit.inc');\ninclude('global_settings.inc');\ninclude('misc_func.inc');\ninclude('rpm.inc');\n\nif (!get_kb_item('Host/local_checks_enabled'))
CVE-2020-27749
