CVE-2021-21787 Privilege escalation in Iobit
An attacker can escalate privileges by exploiting a driver vulnerability that allows arbitrary I/O port writes via a specific IOCTL request.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-21787?
CVE-2021-21787 is a high-severity vulnerability in Iobit, published on 7 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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 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.
Weakness: CWE-782
Which versions are affected by CVE-2021-21787?
It affects 1 product.
Products include Iobit Advanced Systemcare Ultimate.
How do I fix CVE-2021-21787?
No fix has been published for CVE-2021-21787 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-21787 being exploited?
There is no known exploitation of CVE-2021-21787 in the wild and no public exploit code.
Other vulnerabilities in Iobit
Sources
Also known as GHSA-2894-2ggj-v24h.