OPNsense is an open-source firewall and routing platform that is widely used for its extensive security features and high-performance capabilities. The platform is based on FreeBSD and is designed to be a versatile solution for securing networks and managing network traffic. Despite its many advantages, the recent discovery of this vulnerability, CVE-2023-39000, has raised concerns among users and administrators.
Details of the Vulnerability
In OPNsense versions before 23.7, the /ui/diagnostics/log/core/ component fails to properly sanitize user input, allowing attackers to exploit the reflected XSS vulnerability. When this input is subsequently processed and returned to the user's browser, the malicious script embedded by the attacker is executed. This contextually-based attack has the potential to cause harm through the execution of unauthorized actions or extraction of sensitive information.
Here's a sample code snippet that demonstrates how an attacker could exploit this vulnerability
For more details and information, please refer to the following official sources
Currently, there are no known instances of this vulnerability being exploited in the wild. However, given the public nature of this issue and the distribution of information through multiple sources, it is advised that users and administrators take immediate steps to mitigate the risk of exploitation.
To protect against this vulnerability, it is strongly recommended that users and administrators running OPNsense versions before 23.7 immediately upgrade to the latest version, which can be downloaded from https://opnsense.org/download/. Additionally, users should follow best practices for securing their installations, including the use of strong authentication methods and encryption where applicable. Regular security audits and updates should also be conducted to ensure the ongoing security of the system.
Published on: 08/09/2023 19:15:00 UTC
Last modified on: 08/15/2023 15:08:00 UTC