PT-2021-14773 · Iobit · Iobit Advanced Systemcare Ultimate

Cory Duplantis · Published 2021-07-07 · Updated 2022-07-29 · CVE-2021-21788

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions IOBit Advanced SystemCare Ultimate version 14.2.0.220

Description A privilege escalation issue exists due to the way the driver handles Privileged I/O write requests. Specifically, during the IOCTL 0x9c40a0dc operation, the first dword in the input buffer specifies the device port to write to, and the word at offset 4 is the value to write via the OUT instruction. This allows writing one byte to the given I/O device port, potentially leading to escalated privileges for unprivileged users. A local attacker can exploit this by sending a malicious IRP.

Recommendations For IOBit Advanced SystemCare Ultimate version 14.2.0.220, consider restricting access to the IOCTL 0x9c40a0dc operation until a patch is available. As a temporary workaround, disabling the driver's handling of Privileged I/O write requests may mitigate the risk of exploitation.

Exploit

Fix

Weakness Enumeration

CWE-782

Related Identifiers

CVE-2021-21788

Affected Products

Iobit Advanced Systemcare Ultimate

References · 3

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254 · Exploit
• https://osv.dev/vulnerability/CVE-2021-21788 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21788 · Security Note