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{"id": "CVE-2021-20233", "vendorId": null, "type": "cve", "bulletinFamily": "NVD", "title": "CVE-2021-20233", "description": "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.", "published": "2021-03-03T17:15:00", "modified": "2023-11-07T03:29:00", "epss": [{"cve": "CVE-2021-20233", "epss": 0.00042, "percentile": 0.05731, "modified": "2023-12-02"}], "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}, "cvss2": {"cvssV2": {"version": "2.0", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "accessVector": "LOCAL", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "baseScore": 7.2}, "severity": "HIGH", "exploitabilityScore": 3.9, "impactScore": 10.0, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "cvss3": {"cvssV3": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH"}, "exploitabilityScore": 1.5, "impactScore": 6.0}, "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-20233", "reporter": "secalert@redhat.com", "references": ["https://bugzilla.redhat.com/show_bug.cgi?id=1926263", "https://security.gentoo.org/glsa/202104-05", "https://security.netapp.com/advisory/ntap-20220325-0001/", "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/"], "cvelist": ["CVE-2021-20233"], "immutableFields": [], "lastseen": "2023-12-02T14:18:43", "viewCount": 257, "enchantments": {"dependencies": {"references": [{"type": "almalinux", "idList": ["ALSA-2021:0696", "ALSA-2021:1734", "ALSA-2021:2566"]}, {"type": "alpinelinux", "idList": ["ALPINE:CVE-2021-20233"]}, {"type": "amazon", "idList": ["ALAS2-2021-1684"]}, {"type": "archlinux", "idList": ["ASA-202106-43"]}, {"type": "cbl_mariner", "idList": ["CBLMARINER:3935", "CBLMARINER:6466"]}, {"type": "debian", "idList": ["DEBIAN:DSA-4867-1:7DFCD", "DEBIAN:DSA-4867-1:C31EC"]}, {"type": "debiancve", "idList": ["DEBIANCVE:CVE-2021-20233"]}, {"type": "fedora", "idList": ["FEDORA:0311A304C5D2", "FEDORA:2C805304C743", "FEDORA:482AD312AD6B", "FEDORA:5DC52306C90A", "FEDORA:D12B9304C743", "FEDORA:E96CA304C35D"]}, {"type": "gentoo", "idList": ["GLSA-202104-05"]}, {"type": "hp", "idList": ["HP:C06707446", "HPSBHF03799"]}, {"type": "ibm", "idList": ["B80D2752DA6D220C15B399D294DC83B951CF616E39EF752AB12C0553D569D418"]}, {"type": "ics", "idList": ["ICSA-21-336-06"]}, {"type": "mageia", "idList": ["MGASA-2021-0291", "MGASA-2021-0315"]}, {"type": "mscve", "idList": ["MS:ADV200011"]}, {"type": "nessus", "idList": ["AL2_ALAS-2021-1684.NASL", "ALMA_LINUX_ALSA-2021-0696.NASL", "ALMA_LINUX_ALSA-2021-1734.NASL", "ALMA_LINUX_ALSA-2021-2566.NASL", "CENTOS8_RHSA-2021-0696.NASL", "CENTOS8_RHSA-2021-2566.NASL", "DEBIAN_DSA-4867.NASL", "EULEROS_SA-2021-1714.NASL", "EULEROS_SA-2021-1741.NASL", "EULEROS_SA-2021-1794.NASL", "EULEROS_SA-2021-1875.NASL", "EULEROS_SA-2021-1900.NASL", "EULEROS_SA-2021-1927.NASL", "EULEROS_SA-2021-1948.NASL", "EULEROS_SA-2021-2001.NASL", "EULEROS_SA-2021-2027.NASL", "EULEROS_SA-2021-2082.NASL", "EULEROS_SA-2021-2126.NASL", "EULEROS_SA-2021-2376.NASL", "EULEROS_SA-2021-2868.NASL", "GENTOO_GLSA-202104-05.NASL", "NEWSTART_CGSL_NS-SA-2021-0097_GRUB2.NASL", "NEWSTART_CGSL_NS-SA-2021-0133_GRUB2.NASL", "NEWSTART_CGSL_NS-SA-2021-0182_GRUB2.NASL", "OPENSUSE-2021-462.NASL", "ORACLELINUX_ELSA-2021-0696.NASL", "ORACLELINUX_ELSA-2021-0699.NASL", "ORACLELINUX_ELSA-2021-9076.NASL", "ORACLELINUX_ELSA-2021-9077.NASL", "PHOTONOS_PHSA-2021-1_0-0376_GRUB2.NASL", "PHOTONOS_PHSA-2021-2_0-0334_GRUB2.NASL", "PHOTONOS_PHSA-2021-3_0-0202_GRUB2.NASL", "PHOTONOS_PHSA-2021-4_0-0001_GRUB2.NASL", "REDHAT-RHSA-2021-0696.NASL", "REDHAT-RHSA-2021-0697.NASL", "REDHAT-RHSA-2021-0698.NASL", "REDHAT-RHSA-2021-0699.NASL", "REDHAT-RHSA-2021-0700.NASL", "REDHAT-RHSA-2021-0701.NASL", "REDHAT-RHSA-2021-0702.NASL", "REDHAT-RHSA-2021-0703.NASL", "REDHAT-RHSA-2021-0704.NASL", "REDHAT-RHSA-2021-1734.NASL", "REDHAT-RHSA-2021-2566.NASL", "REDHAT-RHSA-2021-2790.NASL", "REDHAT-RHSA-2021-3675.NASL", "ROCKY_LINUX_RLSA-2021-1734.NASL", "ROCKY_LINUX_RLSA-2021-2566.NASL", "SL_20210303_GRUB2_ON_SL7_X.NASL", "SUSE_SU-2021-0679-1.NASL", "SUSE_SU-2021-0681-1.NASL", "SUSE_SU-2021-0682-1.NASL", "SUSE_SU-2021-0683-1.NASL", "SUSE_SU-2021-0684-1.NASL", "SUSE_SU-2021-0685-1.NASL", "SUSE_SU-2021-14659-1.NASL", "UBUNTU_USN-4992-1.NASL", "WINDOWS_UEFI_BOOTHOLE.NBIN"]}, {"type": "oraclelinux", "idList": ["ELSA-2021-0696", "ELSA-2021-0699", "ELSA-2021-9076", "ELSA-2021-9077"]}, {"type": "osv", "idList": ["OSV:CVE-2021-20233", "OSV:DSA-4867-1"]}, {"type": "photon", "idList": ["PHSA-2021-0001", "PHSA-2021-0202", "PHSA-2021-0334", "PHSA-2021-0376", "PHSA-2021-1.0-0376", "PHSA-2021-2.0-0334", "PHSA-2021-3.0-0202", "PHSA-2021-4.0-0001"]}, {"type": "prion", "idList": ["PRION:CVE-2021-20233"]}, {"type": "redhat", "idList": ["RHSA-2021:0696", "RHSA-2021:0697", "RHSA-2021:0698", "RHSA-2021:0699", "RHSA-2021:0700", "RHSA-2021:0701", "RHSA-2021:0702", "RHSA-2021:0703", "RHSA-2021:0704", "RHSA-2021:0980", "RHSA-2021:1734", "RHSA-2021:2566", "RHSA-2021:2790", "RHSA-2021:3675"]}, {"type": "redhatcve", "idList": ["RH:CVE-2020-14372", "RH:CVE-2021-20233", "RH:CVE-2021-3408"]}, {"type": "redos", "idList": ["ROS-20220920-01"]}, {"type": "rocky", "idList": ["RLSA-2021:1734", "RLSA-2021:2566"]}, {"type": "rosalinux", "idList": ["ROSA-SA-2021-1849"]}, {"type": "suse", "idList": ["OPENSUSE-SU-2021:0462-1"]}, {"type": "ubuntu", "idList": ["USN-4992-1"]}, {"type": "ubuntucve", "idList": ["UB:CVE-2021-20233"]}, {"type": "veracode", "idList": ["VERACODE:29544"]}]}, "score": {"value": 8.0, "uncertanity": 0.1, "vector": "NONE"}, "twitter": {"counter": 6, "tweets": [{"link": "https://twitter.com/GrupoICA_Ciber/status/1369934875810222080", "text": "REDHAT\nM\u00faltiples vulnerabilidades de severidad alta en productos REDHAT: \n\nCVE-2021-20233,CVE-2020-25632,CVE-2021-3404,CVE-2021-3403,CVE-2020-25647\n\nM\u00e1s info en: https://t.co/sk4j9cYLBj?amp=1\n/hashtag/ciberseguridad?src=hashtag_click /hashtag/grupoica?src=hashtag_click /hashtag/redhat?src=hashtag_click"}, {"link": "https://twitter.com/WolfgangSesin/status/1370198099839307779", "text": "New post from https://t.co/uXvPWJy6tj?amp=1 (CVE-2021-20233 (enterprise_linux, enterprise_linux_server_aus, enterprise_linux_server_eus, enterprise_linux_server_tus, enterprise_linux_workstation, fedora, grub2)) has been published on https://t.co/pQ68cO8THh?amp=1"}, {"link": "https://twitter.com/threatintelctr/status/1369749778741989382", "text": " NEW: CVE-2021-20233 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 r... (click for more) Severity: HIGH https://t.co/VsVH1hCLZK?amp=1"}, {"link": "https://twitter.com/threatintelctr/status/1369749778741989382", "text": " NEW: CVE-2021-20233 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 r... (click for more) Severity: HIGH https://t.co/VsVH1hCLZK?amp=1"}, {"link": "https://twitter.com/GrupoICA_Ciber/status/1385865482490765316", "text": "REDHAT\nM\u00faltiples vulnerabilidades de severidad alta en productos REDHAT: \n\nCVE-2021-20233,CVE-2021-20232,CVE-2021-20231,CVE-2020-27779,CVE-2020-25632,CVE-2020-14372,CVE-2020-25647\n\nM\u00e1s info en: https://t.co/aMjzuwmvFF?amp=1\n/hashtag/ciberseguridad?src=hashtag_click /hashtag/grupoica?src=hashtag_click /hashtag/redhat?src=hashtag_click"}, {"link": "https://twitter.com/VulmonFeeds/status/1404578948802093058", "text": "CVE-2021-20233\n\nA 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...\n\nhttps://t.co/0fDtdHPyYP?amp=1"}], "modified": "2021-05-01T09:49:22"}, "backreferences": {"references": [{"type": "almalinux", "idList": ["ALSA-2021:0696", "ALSA-2021:1734", "ALSA-2021:2566"]}, {"type": "amazon", "idList": ["ALAS2-2021-1684"]}, {"type": "archlinux", "idList": ["ASA-202106-43"]}, {"type": "debian", "idList": ["DEBIAN:DSA-4867-1:C31EC"]}, {"type": "debiancve", "idList": ["DEBIANCVE:CVE-2021-20233"]}, {"type": "fedora", "idList": ["FEDORA:0311A304C5D2", "FEDORA:2C805304C743", "FEDORA:482AD312AD6B", "FEDORA:5DC52306C90A", "FEDORA:D12B9304C743", "FEDORA:E96CA304C35D"]}, {"type": "gentoo", "idList": ["GLSA-202104-05"]}, {"type": "hp", "idList": ["HP:C06707446"]}, {"type": "ibm", "idList": ["B80D2752DA6D220C15B399D294DC83B951CF616E39EF752AB12C0553D569D418"]}, {"type": "metasploit", "idList": ["MSF:ILITIES/SUSE-CVE-2021-20233/"]}, {"type": "mscve", "idList": ["MS:ADV200011"]}, {"type": "nessus", "idList": ["AL2_ALAS-2021-1684.NASL", "CENTOS8_RHSA-2021-0696.NASL", "CENTOS8_RHSA-2021-2566.NASL", "DEBIAN_DSA-4867.NASL", "EULEROS_SA-2021-1714.NASL", "EULEROS_SA-2021-1741.NASL", "EULEROS_SA-2021-1794.NASL", "EULEROS_SA-2021-1927.NASL", "EULEROS_SA-2021-1948.NASL", "EULEROS_SA-2021-2001.NASL", "EULEROS_SA-2021-2027.NASL", "EULEROS_SA-2021-2082.NASL", "EULEROS_SA-2021-2126.NASL", "GENTOO_GLSA-202104-05.NASL", "ORACLELINUX_ELSA-2021-9076.NASL", "ORACLELINUX_ELSA-2021-9077.NASL", "PHOTONOS_PHSA-2021-1_0-0376_GRUB2.NASL", "PHOTONOS_PHSA-2021-2_0-0334_GRUB2.NASL", "PHOTONOS_PHSA-2021-3_0-0202_GRUB2.NASL", "REDHAT-RHSA-2021-0696.NASL", "REDHAT-RHSA-2021-0697.NASL", "REDHAT-RHSA-2021-0698.NASL", "REDHAT-RHSA-2021-0699.NASL", "REDHAT-RHSA-2021-0700.NASL", "REDHAT-RHSA-2021-0701.NASL", "REDHAT-RHSA-2021-0702.NASL", "REDHAT-RHSA-2021-0703.NASL", "REDHAT-RHSA-2021-0704.NASL", "REDHAT-RHSA-2021-2566.NASL", "REDHAT-RHSA-2021-2790.NASL", "REDHAT-RHSA-2021-3675.NASL", "SUSE_SU-2021-0679-1.NASL", "SUSE_SU-2021-0681-1.NASL", "SUSE_SU-2021-0682-1.NASL", "SUSE_SU-2021-0683-1.NASL", "SUSE_SU-2021-0684-1.NASL", "SUSE_SU-2021-0685-1.NASL", "SUSE_SU-2021-14659-1.NASL", "UBUNTU_USN-4992-1.NASL", "WINDOWS_UEFI_BOOTHOLE.NBIN"]}, {"type": "oraclelinux", "idList": ["ELSA-2021-0699", "ELSA-2021-9076", "ELSA-2021-9077"]}, {"type": "photon", "idList": ["PHSA-2021-1.0-0376", "PHSA-2021-2.0-0334", "PHSA-2021-3.0-0202", "PHSA-2021-4.0-0001"]}, {"type": "redhat", "idList": ["RHSA-2021:3675"]}, {"type": "redhatcve", "idList": ["RH:CVE-2020-14372", "RH:CVE-2021-20233"]}, {"type": "suse", "idList": ["OPENSUSE-SU-2021:0462-1"]}, {"type": "ubuntu", "idList": ["USN-4992-1"]}, {"type": "ubuntucve", "idList": ["UB:CVE-2021-20233"]}]}, "exploitation": null, "epss": [{"cve": "CVE-2021-20233", "epss": 0.00042, "percentile": 0.05667, "modified": "2023-05-07"}], "short_description": "flaw in grub2 prior to 2.06 allows memory corruption via quote", "tags": ["cve-2021-20233", "grub2", "memory corruption", "data integrity", "data confidentiality", "system availability"], "vulnersScore": 8.0}, "_state": {"dependencies": 1701536082, "score": 1701533623, "affected_software_major_version": 0, "epss": 0, "chatgpt": 0}, "_internal": {"score_hash": "a8d64db84fe91c379f8aa36c8e900768", "chatgpt": "bcd8b0c2eb1fce714eab6cef0d771acc"}, "cna_cvss": {"cna": "redhat", "cvss": {}}, "cpe": ["cpe:/o:redhat:enterprise_linux_server_eus:7.7", "cpe:/o:redhat:enterprise_linux_server_eus:8.1", "cpe:/o:redhat:enterprise_linux_server_aus:7.7", "cpe:/o:redhat:enterprise_linux_workstation:7.0", "cpe:/o:redhat:enterprise_linux_server_tus:8.2", "cpe:/o:fedoraproject:fedora:33", "cpe:/o:fedoraproject:fedora:34", "cpe:/o:redhat:enterprise_linux_server_aus:7.4", "cpe:/o:redhat:enterprise_linux_server_aus:7.6", "cpe:/o:redhat:enterprise_linux_server_aus:7.2", "cpe:/o:redhat:enterprise_linux_server_eus:7.6", "cpe:/o:redhat:enterprise_linux:8.0", "cpe:/o:redhat:enterprise_linux_server_aus:7.3", "cpe:/o:redhat:enterprise_linux_server_tus:7.7", "cpe:/o:redhat:enterprise_linux_server_tus:7.6", "cpe:/o:redhat:enterprise_linux:7.0", "cpe:/o:redhat:enterprise_linux_server_tus:7.4", "cpe:/a:netapp:ontap_select_deploy_administration_utility:-", "cpe:/o:redhat:enterprise_linux_server_aus:8.2"], "cpe23": ["cpe:2.3:o:redhat:enterprise_linux_server_eus:8.1:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_eus:7.7:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*"], "cwe": ["CWE-787"], "affectedSoftware": [{"cpeName": "gnu:grub2", "version": "2.06", "operator": "lt", "name": "gnu grub2"}, {"cpeName": "redhat:enterprise_linux_server_aus", "version": "7.2", "operator": "eq", "name": "redhat enterprise linux server aus"}, {"cpeName": "redhat:enterprise_linux_workstation", "version": "7.0", "operator": "eq", "name": "redhat enterprise linux workstation"}, {"cpeName": "redhat:enterprise_linux", "version": "7.0", "operator": "eq", "name": "redhat enterprise linux"}, {"cpeName": "redhat:enterprise_linux_server_aus", "version": "7.3", "operator": "eq", "name": "redhat enterprise linux server aus"}, {"cpeName": "redhat:enterprise_linux_server_aus", "version": "7.4", "operator": "eq", "name": "redhat enterprise linux server aus"}, {"cpeName": "redhat:enterprise_linux_server_tus", "version": "7.4", "operator": "eq", "name": "redhat enterprise linux server tus"}, {"cpeName": "redhat:enterprise_linux_server_tus", "version": "7.6", "operator": "eq", "name": "redhat enterprise linux server tus"}, {"cpeName": "redhat:enterprise_linux_server_eus", "version": "7.6", "operator": "eq", "name": "redhat enterprise linux server eus"}, {"cpeName": "redhat:enterprise_linux_server_aus", "version": "7.6", "operator": "eq", "name": "redhat enterprise linux server aus"}, {"cpeName": "redhat:enterprise_linux", "version": 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"version": "34", "operator": "eq", "name": "fedoraproject fedora"}, {"cpeName": "netapp:ontap_select_deploy_administration_utility", "version": "-", "operator": "eq", "name": "netapp ontap select deploy administration utility"}], "affectedConfiguration": [], "cpeConfiguration": {"CVE_data_version": "4.0", "nodes": [{"operator": "OR", "children": [], "cpe_match": [{"vulnerable": true, "cpe23Uri": "cpe:2.3:a:gnu:grub2:2.06:*:*:*:*:*:*:*", "versionEndExcluding": "2.06", "cpe_name": []}]}, {"operator": "OR", "children": [], "cpe_match": [{"vulnerable": true, "cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*", "cpe_name": []}, {"vulnerable": true, "cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*", "cpe_name": []}, {"vulnerable": true, "cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "cpe_name": []}, {"vulnerable": true, "cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*", "cpe_name": []}, 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{"prion": [{"lastseen": "2023-11-22T00:32:33", "description": "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. 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Setparam_prefix() in\nthe menu rendering code performs a length calculation on the assumption\nthat expressing a quoted single quote will require 3 characters, while it\nactually requires 4 characters which allows an attacker to corrupt memory\nby one byte for each quote in the input. The highest threat from this\nvulnerability is to data confidentiality and integrity as well as system\navailability.\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": 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": "ubuntucve", "title": "CVE-2021-20233", "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-2021-20233"], "modified": "2021-03-02T00:00:00", "id": "UB:CVE-2021-20233", "href": "https://ubuntu.com/security/CVE-2021-20233", "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. 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.", "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": "2021-03-03T17:15:00", "type": "alpinelinux", "title": "CVE-2021-20233", "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-2021-20233"], "modified": "2023-11-07T03:29:00", "id": "ALPINE:CVE-2021-20233", "href": "https://security.alpinelinux.org/vuln/CVE-2021-20233", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}], "osv": [{"lastseen": "2022-11-22T20:48:04", "description": "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.", "cvss3": {}, "published": "2021-03-03T17:15:00", "type": "osv", "title": "CVE-2021-20233", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2021-20233"], "modified": "2022-11-22T20:48:03", "id": "OSV:CVE-2021-20233", "href": "https://osv.dev/vulnerability/CVE-2021-20233", "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"}}], "redhatcve": [{"lastseen": "2023-12-02T17:38:19", "description": "A flaw was found in grub2. 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.\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": "2021-03-02T21:11:09", "type": "redhatcve", "title": "CVE-2021-20233", "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-2021-20233"], "modified": "2023-11-16T13:45:01", "id": "RH:CVE-2021-20233", "href": "https://access.redhat.com/security/cve/cve-2021-20233", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-12-02T17:38:19", "description": "** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: none.\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": "2021-03-02T18:33:45", "type": "redhatcve", "title": "CVE-2021-3408", "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-2021-20233", "CVE-2021-3408"], "modified": "2023-04-06T08:02:19", "id": "RH:CVE-2021-3408", "href": "https://access.redhat.com/security/cve/cve-2021-3408", "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. 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security_report_v4(\n port : 0,\n severity : SECURITY_HOLE,\n extra : extra\n );\n exit(0);\n}\nelse\n{\n var tested = pkg_tests_get();\n if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);\n else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'grub2 / grub2-common / grub2-efi-aa64-modules / grub2-efi-ia32 / etc');\n}\n", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2023-11-28T15:43:58", "description": "The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has grub2 packages installed that are affected by multiple vulnerabilities:\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. 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. 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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