(Pwn2Own) QNAP QHora-322 qsyslog-cli username Format String Remote Code Execution Vulnerability
Vulnerability Details
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of QNAP QHora-322 routers. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of the username parameter provided to the qsyslog-cli executable. The issue results from the lack of proper validation of a user-supplied string before using it as a format specifier. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root.
Additional Details
QNAP has issued an update to correct this vulnerability. More details can be found at:
https://www.qnap.com/en-us/security-advisories
Disclosure Timeline
- 2024-12-02 - Vulnerability reported to vendor
- 2025-07-31 - Coordinated public release of advisory
- 2025-07-31 - Advisory Updated
Credit
Chris Anastasio @mufinnnnnnn & Fabius Watson
