UEditor Server-Side Request Forgery Scanner

UEditor is a widely used web-based rich text editor created by Baidu. It is commonly integrated into content management systems, forums, and websites to facilitate text editing and content creation. Developers and administrators utilize UEditor to enhance user interaction and provide a seamless online editing experience. Originally designed for ease of use and flexibility, UEditor offers multiple plugins and customizable features to adapt to diverse web applications. Its dynamic and user-friendly interface makes it a prominent choice in the industry. However, like many web applications, it needs regular updates and security audits to protect against vulnerabilities.

The Server-Side-Request-Forgery (SSRF) vulnerability found in UEditor could enable an attacker to make requests from the server where UEditor is installed. SSRF allows hackers to manipulate the server-side component to send requests to unintended locations. This vulnerability can lead to unauthorized access to internal systems, leak sensitive information, and potentially perform further attacks in an isolated system. The exploit typically involves an attacker supplying a URL to the server, which then makes a request on behalf of the attacker. Proper validation and restriction measures are needed to mitigate such vulnerabilities.

Technical details reveal that the SSRF vulnerability in UEditor resides in certain endpoints that handle image fetching functionalities via HTTP requests. The vulnerable endpoints can be manipulated in a way that allows external URL input, facilitating the sending of requests on behalf of the server. These parameters do not sufficiently validate or sanitize URLs, enabling a crafted exploit to trigger the SSRF condition. The threat level is contingent on the ability of the attacker to connect to resources within internal networks or other trusted zones.

Exploiting the SSRF vulnerability can have severe consequences, such as unauthorized network scanning, extraction of sensitive data, and leveraging internal services to probe and exploit other vulnerabilities within the server's internal network. Attackers might also conduct service disruptions or privilege escalations based on the data accessed through SSRF. The extent of damage is highly dependent on the data accessible via the server requests.

REFERENCES

• https://xz.aliyun.com/t/4154
• https://www.seebug.org/vuldb/ssvid-97311