CVE-2021-21787

A privilege escalation vulnerability exists in the way IOBit Advanced SystemCare Ultimate 14.2.0.220 driver handles Privileged I/O write requests. During IOCTL 0x9c40a0d8, the first dword passed in the input buffer is the device port to write to and the byte at offset 4 is the value to write via the OUT instruction. The OUT instruction can write one byte to the given I/O device port, potentially leading to escalated privileges of unprivileged users.

CVSS v3 8.8 HIGH
CVSS v2.0 4.6 MEDIUM

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.0 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

4.6^/10

CVSS v2.0 : MEDIUM

Vector : AV:L/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 3.9 / Impact : 6.4

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254	Exploit Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:iobit:advanced_systemcare_ultimate:14.2.0.220:*:*:*:*:*:*:*

History

21 Nov 2024, 05:48

Type	Values Removed	Values Added
References	~~() https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254 - Exploit, Third Party Advisory~~	() https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254 - Exploit, Third Party Advisory

Information

Published : 2021-07-07 17:15

Updated : 2024-11-21 05:48

NVD link : CVE-2021-21787

Mitre link : CVE-2021-21787

CVE.ORG link : CVE-2021-21787

JSON object : View

Products Affected

iobit

advanced_systemcare_ultimate

CWE

CWE-782

Exposed IOCTL with Insufficient Access Control

NVD-CWE-Other

{"id": "CVE-2021-21787", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.6, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Secondary", "source": "talos-cna@cisco.com", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}]}, "published": "2021-07-07T17:15:07.957", "references": [{"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254", "tags": ["Exploit", "Third Party Advisory"], "source": "talos-cna@cisco.com"}, {"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254", "tags": ["Exploit", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "talos-cna@cisco.com", "description": [{"lang": "en", "value": "CWE-782"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-Other"}]}], "descriptions": [{"lang": "en", "value": "A privilege escalation vulnerability exists in the way IOBit Advanced SystemCare Ultimate 14.2.0.220 driver handles Privileged I/O write requests. During IOCTL 0x9c40a0d8, the first dword passed in the input buffer is the device port to write to and the byte at offset 4 is the value to write via the OUT instruction. The OUT instruction can write one byte to the given I/O device port, potentially leading to escalated privileges of unprivileged users."}, {"lang": "es", "value": "Se presenta una vulnerabilidad de escalada de privilegios en la forma en que el controlador IOBit Advanced SystemCare Ultimate versi\u00f3n 14.2.0.220, maneja las peticiones de escritura de I/O con Privilegios. Durante IOCTL 0x9c40a0d8, el primer dword pasado en el buffer de entrada es el puerto del dispositivo para escribir y el byte en el offset 4 es el valor para escribir por medio de la instrucci\u00f3n OUT. Un atacante local puede enviar un IRP malicioso para activar esta vulnerabilidad"}], "lastModified": "2024-11-21T05:48:58.250", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:iobit:advanced_systemcare_ultimate:14.2.0.220:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9B0C837B-7E2B-4AD5-8CFE-EE9CC92D1115"}], "operator": "OR"}]}], "sourceIdentifier": "talos-cna@cisco.com"}