Description: 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 0x9c40a0dc, the first dword passed in the input buffer is the device port to write to and the word 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. A local attacker can send a malicious IRP to trigger this vulnerability.
CVE-2021-21788
Published Date: 2021-07-07T17:15Z
Last Modified: 2022-07-29T12:57Z
CVSS Score: 8.8 (HIGH)
EPSS Score: 0.04%
Risk Score: 6.16 (HIGH)
Risk Score based on CVSS score and EPSS. This score is for reference purposes and is not internationally recognized.
CVSS:
8.8 |
EPSS:
0.04%
Mitre ATT&CK Technical v15.1
T1053.002 – At
Technical Analysis & Mitigation Measures
Reference Links
Vendor - Produce - Version
advanced_systemcare_ultimate - iobit
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