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

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2021-07-07 17:15

Updated : 2024-02-28 18:28

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

NVD-CWE-Other CWE-782

Exposed IOCTL with Insufficient Access Control

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