CVE-2020-27749

{"containers": {"cna": {"affected": [{"product": "grub2", "vendor": "n/a", "versions": [{"status": "affected", "version": "grub 2.06"}]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-121", "description": "CWE-121", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-03-25T07:06:23.000Z", "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"}, {"name": "FEDORA-2021-cab258a413", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/"}, {"name": "GLSA-202104-05", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202104-05"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://security.netapp.com/advisory/ntap-20220325-0001/"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "secalert@redhat.com", "ID": "CVE-2020-27749", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "grub2", "version": {"version_data": [{"version_value": "grub 2.06"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-121"}]}]}, "references": {"reference_data": [{"name": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966", "refsource": "MISC", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"}, {"name": "FEDORA-2021-cab258a413", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/"}, {"name": "GLSA-202104-05", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202104-05"}, {"name": "https://security.netapp.com/advisory/ntap-20220325-0001/", "refsource": "CONFIRM", "url": "https://security.netapp.com/advisory/ntap-20220325-0001/"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T16:18:45.656Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"}, {"name": "FEDORA-2021-cab258a413", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/"}, {"name": "GLSA-202104-05", "tags": ["vendor-advisory", "x_refsource_GENTOO", "x_transferred"], "url": "https://security.gentoo.org/glsa/202104-05"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://security.netapp.com/advisory/ntap-20220325-0001/"}]}]}, "cveMetadata": {"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "assignerShortName": "redhat", "cveId": "CVE-2020-27749", "datePublished": "2021-03-03T16:40:30.000Z", "dateReserved": "2020-10-27T00:00:00.000Z", "dateUpdated": "2024-08-04T16:18:45.656Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "grub2", "vendor": "n/a", "versions": [{"status": "affected", "version": "grub 2.06"}]}], "source": "secalert@redhat.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*", "matchCriteriaId": "01F8D62F-70BB-4718-A095-D68540C17EEA", "versionEndExcluding": "2.06", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*", "matchCriteriaId": "1C8D871B-AEA1-4407-AEE3-47EC782250FF", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*", "matchCriteriaId": "98381E61-F082-4302-B51F-5648884F998B", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*", "matchCriteriaId": "D99A687E-EAE6-417E-A88E-D0082BC194CD", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*", "matchCriteriaId": "B353CE99-D57C-465B-AAB0-73EF581127D1", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*", "matchCriteriaId": "7431ABC1-9252-419E-8CC1-311B41360078", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*", "matchCriteriaId": "6897676D-53F9-45B3-B27F-7FF9A4C58D33", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*", "matchCriteriaId": "BF77CDCF-B9C9-427D-B2BF-36650FB2148C", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_eus:7.7:*:*:*:*:*:*:*", "matchCriteriaId": "21690BAC-2129-4A33-9B48-1F3BF30072A9", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_eus:8.1:*:*:*:*:*:*:*", "matchCriteriaId": "F2FF6D89-9361-45B9-ABCC-1A5E600BD63C", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*", "matchCriteriaId": "D5F7E11E-FB34-4467-8919-2B6BEAABF665", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*", "matchCriteriaId": "B76AA310-FEC7-497F-AF04-C3EC1E76C4CC", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*", "matchCriteriaId": "17F256A9-D3B9-4C72-B013-4EFD878BFEA8", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*", "matchCriteriaId": "B09ACF2D-D83F-4A86-8185-9569605D8EE1", "vulnerable": true}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "825ECE2D-E232-46E0-A047-074B34DB1E97", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194", "vulnerable": true}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*", "matchCriteriaId": "E7CF3019-975D-40BB-A8A4-894E62BD3797", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en grub2 en versiones anteriores a 2.06. Los nombres de las variables presentes se expanden en la l\u00ednea de comando proporcionada en sus correspondientes contenidos de variables, usando un b\u00fafer de la pila de 1kB para el almacenamiento temporal, sin una comprobaci\u00f3n suficiente de l\u00edmites. Si la funci\u00f3n es llamada con una l\u00ednea de comando que hace referencia a una variable con una carga \u00fatil suficientemente grande, es posible desbordar el b\u00fafer de la pila, corromper la trama de la pila y controlar una ejecuci\u00f3n, lo que tambi\u00e9n podr\u00eda omitir las protecciones de Secure Boot. La mayor amenaza de esta vulnerabilidad es la confidencialidad e integridad de los datos, as\u00ed como la disponibilidad del sistema"}], "id": "CVE-2020-27749", "lastModified": "2026-06-17T03:09:34.223", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-03T17:15:11.787", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"}, {"source": "secalert@redhat.com", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202104-05"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220325-0001/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202104-05"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220325-0001/"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Chris Coulson (Canonical) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:0699", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "grub2-1:2.02-0.87.el7_9.2", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0704", "cpe": "cpe:/o:redhat:rhel_aus:7.2", "package": "grub2-1:2.02-0.86.el7_2.2", "product_name": "Red Hat Enterprise Linux 7.2 Advanced Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0703", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "grub2-1:2.02-0.86.el7_3.2", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0702", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "grub2-1:2.02-0.86.el7_4.2", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0702", "cpe": "cpe:/o:redhat:rhel_tus:7.4", "package": "grub2-1:2.02-0.86.el7_4.2", "product_name": "Red Hat Enterprise Linux 7.4 Telco Extended Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0702", "cpe": "cpe:/o:redhat:rhel_e4s:7.4", "package": "grub2-1:2.02-0.86.el7_4.2", "product_name": "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0701", "cpe": "cpe:/o:redhat:rhel_eus:7.6", "package": "grub2-1:2.02-0.86.el7_6.3", "product_name": "Red Hat Enterprise Linux 7.6 Extended Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0700", "cpe": "cpe:/o:redhat:rhel_eus:7.7", "package": "grub2-1:2.02-0.86.el7_7.3", "product_name": "Red Hat Enterprise Linux 7.7 Extended Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:0696", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "grub2-1:2.02-90.el8_3.1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:1734", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "shim-0:15.4-2.el8_1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-05-18T00:00:00Z"}, {"advisory": "RHSA-2021:1734", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "shim-unsigned-aarch64-0:15-7.el8_1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-05-18T00:00:00Z"}, {"advisory": "RHSA-2021:1734", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "shim-unsigned-x64-0:15.4-4.el8_1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-05-18T00:00:00Z"}, {"advisory": "RHSA-2021:2566", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "fwupd-0:1.5.9-1.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-06-29T00:00:00Z"}, {"advisory": "RHSA-2021:0698", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "grub2-1:2.02-87.el8_1.2", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:3675", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "fwupd-0:1.1.4-4.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-09-28T00:00:00Z"}, {"advisory": "RHSA-2021:3675", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "shim-0:15.4-2.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-09-28T00:00:00Z"}, {"advisory": "RHSA-2021:3675", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "shim-unsigned-aarch64-0:15-7.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-09-28T00:00:00Z"}, {"advisory": "RHSA-2021:3675", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "shim-unsigned-x64-0:15.4-4.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-09-28T00:00:00Z"}, {"advisory": "RHSA-2021:0697", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "grub2-1:2.02-87.el8_2.3", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-03-02T00:00:00Z"}, {"advisory": "RHSA-2021:2790", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "fwupd-0:1.1.4-9.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-07-20T00:00:00Z"}, {"advisory": "RHSA-2021:2790", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "shim-0:15.4-2.el8_1", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-07-20T00:00:00Z"}, {"advisory": "RHSA-2021:2790", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "shim-unsigned-aarch64-0:15-7.el8_1", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-07-20T00:00:00Z"}, {"advisory": "RHSA-2021:2790", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "shim-unsigned-x64-0:15.4-4.el8_1", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-07-20T00:00:00Z"}], "bugzilla": {"description": "grub2: Stack buffer overflow in grub_parser_split_cmdline()", "id": "1899966", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-121", "details": ["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.", "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."], "name": "CVE-2020-27749", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "fwupd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "fwupdate", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2021-03-02T18:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-27749\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-27749"], "threat_severity": "Moderate"}

{}