Realtek rtl81xx SDK Wi-Fi Driver rtwlanu Heap-based Buffer Overflow Local Privilege Escalation Vulnerability

Vulnerability Details

This vulnerability allows local attackers to escalate privileges on affected installations of Realtek rtl81xx SDK Wi-Fi driver. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the N6CSet_DOT11_CIPHER_DEFAULT_KEY function. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

Additional Details

Fixed in v1030.44.1204.2024 - https://www.realtek.com/Article/Index?menu_id=848

Disclosure Timeline

• 2025-02-21 - Vulnerability reported to vendor
• 2025-09-02 - Coordinated public release of advisory
• 2025-09-02 - Advisory Updated

Credit

dungnm from vcslab of Viettel Cyber Security

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