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.
The product implements an IOCTL with functionality that should be restricted, but it does not properly enforce access control for the IOCTL.
| Link | Tags |
|---|---|
| https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254 | third party advisory exploit |