Description
The UX360CA BIOS through 303 on ASUS laptops allow an attacker (with the ring 0 privilege) to overwrite nearly arbitrary physical memory locations, including SMRAM, and execute arbitrary code in the SMM (issue 3 of 3).
Affected Software
Related
{"id": "CVE-2021-26943", "vendorId": null, "type": "cve", "bulletinFamily": "NVD", "title": "CVE-2021-26943", "description": "The UX360CA BIOS through 303 on ASUS laptops allow an attacker (with the ring 0 privilege) to overwrite nearly arbitrary physical memory locations, including SMRAM, and execute arbitrary code in the SMM (issue 3 of 3).", "published": "2021-03-31T20:15:00", "modified": "2021-04-07T14:12:00", "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-2021-26943", "reporter": "cve@mitre.org", "references": ["https://www.asus.com/support/FAQ/1045541/", "https://www.youtube.com/watch?v=1H3AfaVyeuk"], "cvelist": ["CVE-2021-26943"], "immutableFields": [], "lastseen": "2022-03-23T15:53:12", "viewCount": 36, "enchantments": {"dependencies": {"references": [{"type": "githubexploit", "idList": ["BC7BF8EC-4D5F-580E-B5FC-52260BB2BBA3"]}], "rev": 4}, "score": {"value": 5.3, "vector": "NONE"}, "backreferences": {"references": [{"type": "githubexploit", "idList": ["BC7BF8EC-4D5F-580E-B5FC-52260BB2BBA3"]}]}, "exploitation": null, "vulnersScore": 5.3}, "_state": {"dependencies": 0}, "_internal": {}, "cna_cvss": {"cna": null, "cvss": {}}, "cpe": [], "cpe23": [], "cwe": ["NVD-CWE-noinfo"], "affectedSoftware": [{"cpeName": "asus:ux360ca_bios", "version": "304", "operator": "lt", "name": "asus ux360ca bios"}], "affectedConfiguration": [{"name": "asus ux360ca", "cpeName": "asus:ux360ca", "version": "-", "operator": "eq"}], "cpeConfiguration": {"CVE_data_version": "4.0", "nodes": [{"operator": "AND", "children": [{"operator": "OR", "children": [], "cpe_match": [{"vulnerable": true, "cpe23Uri": "cpe:2.3:o:asus:ux360ca_bios:304:*:*:*:*:*:*:*", "versionEndExcluding": "304", "cpe_name": []}]}, {"operator": "OR", "children": [], "cpe_match": [{"vulnerable": false, "cpe23Uri": "cpe:2.3:h:asus:ux360ca:-:*:*:*:*:*:*:*", "cpe_name": []}]}], "cpe_match": []}]}, "extraReferences": [{"url": "https://www.asus.com/support/FAQ/1045541/", "name": "https://www.asus.com/support/FAQ/1045541/", "refsource": "CONFIRM", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://www.youtube.com/watch?v=1H3AfaVyeuk", "name": "https://www.youtube.com/watch?v=1H3AfaVyeuk", "refsource": "MISC", "tags": ["Exploit", "Third Party Advisory"]}]}
{"githubexploit": [{"lastseen": "2022-07-03T19:24:35", "description": "# SmmExploit\r\n\r\nThis is a report and an exploit of [CVE-2021-269...", "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": "2020-12-31T16:30:02", "type": "githubexploit", "title": "Exploit for Vulnerability in Asus Ux360Ca Bios", "bulletinFamily": "exploit", "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-2021-26943"], "modified": "2022-07-03T15:31:33", "id": "BC7BF8EC-4D5F-580E-B5FC-52260BB2BBA3", "href": "", "cvss": {"score": 7.2, "vector": "AV:L/AC:L/Au:N/C:C/I:C/A:C"}, "privateArea": 1}]}