CVE-2023-49805 : What You Need to Know
Discover the impact of CVE-2023-49805 affecting Uptime Kuma versions prior to 1.23.9. Learn about the vulnerability, its exploitation, and mitigation strategies.
Uptime Kuma Missing Origin Validation in WebSockets is a vulnerability that affects versions prior to 1.23.9 of the Uptime Kuma self-hosted monitoring tool.
Understanding CVE-2023-49805
This CVE involves a security issue in Uptime Kuma where WebSocket communication is not validated for the source, allowing unauthorized third-party access.
What is CVE-2023-49805?
Uptime Kuma, before version 1.23.9, lacks validation for the origin of WebSocket communications. This oversight permits unauthorized websites to establish connections without proper authentication.
The Impact of CVE-2023-49805
The vulnerability enables attackers to bypass firewall protections, potentially leading to unauthorized access. While sensitive endpoints may remain secure, the flaw could facilitate the exploitation of other vulnerabilities within the application.
Technical Details of CVE-2023-49805
Uptime Kuma uses WebSocket (with Socket.io) for communication, but fails to verify the validity of the source.
Vulnerability Description
The absence of origin validation allows connections from unauthorized websites, posing a significant security risk to Uptime Kuma users.
Affected Systems and Versions
Versions prior to 1.23.9 of Uptime Kuma are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit this issue by establishing unauthorized connections to the server, potentially compromising the application's security.
Mitigation and Prevention
To address CVE-2023-49805, immediate steps must be taken to secure affected systems.
Immediate Steps to Take
Users are advised to update to version 1.23.9 of Uptime Kuma, where additional verification of the HTTP Origin header has been implemented.
Long-Term Security Practices
Implementing strict origin validation practices and regularly updating security measures can help prevent similar vulnerabilities in the future.
Patching and Updates
Users can override default behavior by setting the environment variable 'UPTIME_KUMA_WS_ORIGIN_CHECK=bypass' to modify the connection handling.