Insufficient Input Validation in MediaTek Chipsets (CVE‑2020‑0069) Enables Privilege Escalation
What It Is – MediaTek’s Command Queue driver ioctl handlers lack proper input validation and SELinux restrictions, allowing an out‑of‑bounds write that can be leveraged for privilege escalation.
Exploitability – The flaw has been demonstrated in the “AbstractEmu” exploit chain, combined with CVE‑2019‑2215 and CVE‑2020‑0041. Public PoC exists; attackers can achieve kernel‑level code execution on affected devices.
Affected Products – Multiple MediaTek chipset families used in smartphones, IoT devices, and embedded systems (e.g., Helio, Dimensity series).
Why It Matters for Trust & Control Assurance
- Demonstrates the need for a robust vulnerability‑management control that continuously inventories firmware/OS components and validates patch status.
- Missing SELinux constraints highlight gaps in secure configuration and least‑privilege enforcement, which are evidence points auditors request.
- Exploit chaining shows that a single unpatched component can compromise the entire device supply chain, stressing the importance of continuous monitoring of third‑party firmware.
Recommended Actions
- Identify all assets running the affected MediaTek chipsets via inventory tools.
- Apply vendor‑provided firmware updates or mitigations immediately.
- Enable SELinux enforcing mode on affected devices where possible.
- Integrate the patch status into your continuous control‑evidence pipeline to demonstrate remediation.
- Monitor logs for abnormal ioctl calls or privilege‑escalation attempts.
Source: CISA KEV – CVE‑2020‑0069