CVE-2025-2997 in youkefu
Summary
by MITRE • 03/31/2025
A vulnerability was found in zhangyanbo2007 youkefu 4.2.0. It has been classified as critical. Affected is an unknown function of the file /res/url. The manipulation of the argument url leads to server-side request forgery. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 10/10/2025
This vulnerability resides within the zhangyanbo2007 youkefu 4.2.0 application where a critical server-side request forgery flaw has been identified in the url handling functionality. The vulnerability specifically affects the /res/url endpoint where improper input validation allows malicious actors to manipulate the url argument parameter. This creates a dangerous condition where external requests can be initiated from the vulnerable server without proper authorization or validation.
The technical implementation of this flaw stems from inadequate sanitization of user-supplied url parameters within the application's request processing pipeline. When the application receives a url argument through the /res/url endpoint, it fails to properly validate or sanitize the input before processing. This allows an attacker to craft malicious url values that can trigger the application to make unintended outbound requests to arbitrary destinations. The vulnerability operates at the server-side level, meaning the malicious request originates from the application server itself rather than from the client side, making it particularly dangerous as it can bypass typical client-side security controls.
The operational impact of this vulnerability is severe and multifaceted. Remote exploitation is possible, allowing attackers to leverage this flaw from outside the network perimeter without requiring authentication or prior access. This capability enables attackers to potentially access internal network resources that would otherwise be protected by firewalls or network segmentation. The vulnerability can be exploited to perform reconnaissance activities by making requests to internal systems, potentially leading to further exploitation of other vulnerabilities within the internal network. Additionally, the public disclosure of the exploit means that threat actors can readily implement this attack without requiring advanced technical skills.
This vulnerability aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate or sanitize user-supplied URLs that are used to make outbound requests. The attack pattern follows ATT&CK technique T1190, which covers the exploitation of vulnerabilities in web applications to perform server-side request forgery. The flaw represents a critical security gap that allows attackers to potentially escalate their access within the network environment and could facilitate more sophisticated attacks such as internal reconnaissance, data exfiltration, or further compromise of systems within the organization's infrastructure.
Mitigation strategies should include immediate implementation of input validation and sanitization measures for all url parameters processed by the application. Organizations should deploy web application firewalls that can detect and block suspicious outbound requests originating from the vulnerable application. Network segmentation and outbound traffic filtering should be implemented to restrict the application's ability to make arbitrary external connections. The application should be updated to a patched version that properly validates and sanitizes url parameters before processing. Additionally, monitoring and logging should be enhanced to detect unusual outbound requests that may indicate exploitation attempts. Regular security assessments and penetration testing should be conducted to identify and remediate similar vulnerabilities in other components of the application ecosystem.