CVE-2023-39240 : What You Need to Know
Learn about the critical format string vulnerability in ASUS RT-AX56U V2, allowing unauthenticated remote attackers to execute arbitrary code or disrupt services. Mitigation steps provided.
A format string vulnerability has been identified in ASUS RT-AX56U V2, affecting the iperf client function API. This vulnerability allows unauthenticated remote attackers to execute arbitrary code, system operations, or disrupt services.
Understanding CVE-2023-39240
This section will delve into the details of the CVE-2023-39240 vulnerability affecting ASUS RT-AX56U V2.
What is CVE-2023-39240?
CVE-2023-39240 is a format string vulnerability in the iperf client function API of ASUS RT-AX56U V2, allowing unauthenticated remote attackers to exploit the lack of validation for a specific value within the set_iperf3_cli.cgi module.
The Impact of CVE-2023-39240
The impact of this vulnerability is critical, with a CVSS base score of 9.8. Attackers can perform remote arbitrary code execution, arbitrary system operations, or disrupt services without the need for privileges.
Technical Details of CVE-2023-39240
This section will provide technical insights into the vulnerability including its description, affected systems and versions, and exploitation mechanism.
Vulnerability Description
The vulnerability stems from a lack of validation for a specific value within the set_iperf3_cli.cgi module, leading to a format string vulnerability in ASUS RT-AX56U V2.
Affected Systems and Versions
- Product: RT-AX55
- Vendor: ASUS
- Version: 3.0.0.4.386_50460 (Affected)
- Product: RT-AX56U_V2
- Vendor: ASUS
- Version: 3.0.0.4.386_50460 (Affected)
- Product: RT-AC86U
- Vendor: ASUS
- Version: 3.0.0.4_386_51529 (Affected)
Exploitation Mechanism
Unauthenticated remote attackers can exploit this vulnerability to execute arbitrary code, system operations, or disrupt service without requiring any privileges.
Mitigation and Prevention
In this section, we will explore the measures to mitigate and prevent the exploitation of CVE-2023-39240.
Immediate Steps to Take
- Update RT-AX55 to version 3.0.0.4.386_51948
- Update RT-AX56U_V2 to version 3.0.0.4.386_51948
- Update RT-AC86U to version 3.0.0.4.386_51915
Long-Term Security Practices
Ensure regular security audits, monitor for updates from ASUS, and apply patches promptly to prevent known vulnerabilities.
Patching and Updates
Regularly check for security updates and patches from ASUS for the affected versions to stay protected against potential exploits.