Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Iobit | Advanced Systemcare Ultimate | 14.2.0.220 |
Related Weaknesses (CWE)
References
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254ExploitThird Party Advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254ExploitThird Party Advisory
FAQ
What is CVE-2021-21788?
CVE-2021-21788 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 th...
How severe is CVE-2021-21788?
CVE-2021-21788 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21788?
Check the references section above for vendor advisories and patch information. Affected products include: Iobit Advanced Systemcare Ultimate.