CVE-2025-50900

Comprehensive Technical Analysis of CVE-2025-50900

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-50900 CVSS Score: 9.8

The vulnerability in question affects the getrebuild/rebuild software version 4.0.4, specifically within the com.rebuild.web.RebuildWebInterceptor class and the preHandle function. The issue arises from improper handling of URL-decoded request paths, which can lead to unauthenticated access to sensitive information or privilege escalation.

Severity Evaluation:

• CVSS Score: 9.8 (Critical)
• Impact: High
• Exploitability: High

The high CVSS score indicates a critical vulnerability that can be easily exploited with severe consequences. The vulnerability allows unauthenticated attackers to bypass security checks, potentially leading to unauthorized access to sensitive data or escalated privileges.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Unauthenticated Access: An attacker can craft a URL that, when decoded, ends with /error, bypassing the interceptor and gaining access to restricted areas.
2. Privilege Escalation: By manipulating the request path, an attacker can potentially redirect to internal APIs or services that require higher privileges.

Exploitation Methods:

• URL Manipulation: Attackers can encode malicious URLs that, when decoded, match the /error endpoint, allowing them to bypass authentication checks.
• Redirect Manipulation: By manipulating the request path, attackers can force the application to redirect to unintended endpoints, potentially exposing sensitive information or internal services.

3. Affected Systems and Software Versions

Affected Software:

• getrebuild/rebuild version 4.0.4

Affected Systems:

• Any system running the affected version of getrebuild/rebuild software.
• Systems that rely on the RebuildWebInterceptor class for request handling and authentication.

4. Recommended Mitigation Strategies

Immediate Actions:

1. Patching: Upgrade to a patched version of getrebuild/rebuild that addresses this vulnerability.
2. Temporary Workaround: Implement a temporary filter to block requests that match the vulnerable pattern until a patch is available.

Long-Term Mitigations:

1. Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities in other parts of the application.
2. Input Validation: Enhance input validation and sanitization to ensure that URL-decoded paths are properly handled.
3. Access Controls: Strengthen access controls and authentication mechanisms to prevent unauthorized access.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2025-50900 highlights the importance of robust input validation and secure coding practices. This vulnerability underscores the need for:

• Regular Security Audits: Continuous security assessments to identify and mitigate vulnerabilities.
• Secure Coding Practices: Adherence to secure coding guidelines to prevent common vulnerabilities.
• Incident Response: Effective incident response plans to quickly address and mitigate critical vulnerabilities.

6. Technical Details for Security Professionals

Vulnerable Code Snippet:

String decodedPath = CodecUtils.urlDecode(request.getRequestURI());
if (decodedPath.endsWith("/error")) {
    return true;
} else {
    response.sendRedirect("/user/login");
    return false;
}

Technical Analysis:

• The CodecUtils.urlDecode function decodes the request URI, which can be manipulated by an attacker to bypass the interceptor.
• The endsWith("/error") check is insufficient to prevent unauthorized access, as attackers can craft URLs that decode to match this pattern.

Recommended Fix:

• Implement additional checks to validate the decoded path and ensure it does not bypass authentication mechanisms.
• Use secure coding practices to handle URL decoding and path validation.

Example Fix:

String decodedPath = CodecUtils.urlDecode(request.getRequestURI());
if (decodedPath.endsWith("/error") && isAuthenticated(request)) {
    return true;
} else {
    response.sendRedirect("/user/login");
    return false;
}

Conclusion: CVE-2025-50900 represents a critical vulnerability that can be exploited to gain unauthorized access or escalate privileges. Immediate patching and long-term mitigation strategies are essential to protect affected systems. This vulnerability serves as a reminder of the importance of secure coding practices and regular security audits in maintaining a robust cybersecurity posture.