CVE-2020-25466 in CRMEB
Summary
by MITRE • 10/23/2020
A SSRF vulnerability exists in the downloadimage interface of CRMEB 3.0, which can remotely download arbitrary files on the server and remotely execute arbitrary code.
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Analysis
by VulDB Data Team • 07/05/2026
The CVE-2020-25466 vulnerability represents a critical server-side request forgery flaw within the CRMEB 3.0 content management system that fundamentally undermines the application's security boundaries. This vulnerability manifests specifically within the downloadimage interface, where the application fails to properly validate or sanitize user-supplied input parameters that dictate the source of images to be downloaded and processed. The flaw allows an attacker to manipulate the image download mechanism to target arbitrary URLs or file paths on the server, effectively bypassing the intended access controls and creating a pathway for unauthorized file operations. The vulnerability's classification aligns with CWE-918, which describes server-side request forgery vulnerabilities where applications fail to properly validate external resource requests. This issue directly maps to the ATT&CK technique T1190, which involves exploiting vulnerabilities in web applications to gain unauthorized access to server resources.
The technical exploitation of this vulnerability enables attackers to perform remote file inclusion operations that can extend beyond simple image downloading to full remote code execution capabilities. When the application processes malicious input through the downloadimage endpoint, it accepts user-controllable parameters that are then used to construct file paths or URLs for server-side processing. This lack of input validation creates a scenario where an attacker can specify not only the image source but potentially the entire file system path or network location, allowing for arbitrary file read operations, directory traversal attacks, and ultimately code execution. The vulnerability's severity stems from the fact that it operates at the server level, meaning successful exploitation can provide attackers with direct access to the underlying operating system and its resources. The flaw essentially transforms a legitimate image download function into a remote command execution vector, making it particularly dangerous for applications that handle sensitive data or operate in production environments.
The operational impact of CVE-2020-25466 extends far beyond simple data theft, as it creates a persistent attack surface that can be leveraged for comprehensive system compromise. Organizations utilizing CRMEB 3.0 may find their servers compromised through this vulnerability, potentially leading to data breaches, system infiltration, and unauthorized access to sensitive customer information. The vulnerability's remote exploitation capability means that attackers do not require physical access to the network or system, making it particularly dangerous for web applications that are publicly accessible. Once exploited, the vulnerability can be used to escalate privileges, establish persistent backdoors, or serve as a launch point for further attacks within the network infrastructure. The impact is compounded by the fact that many organizations may not immediately discover such vulnerabilities, allowing attackers to maintain access for extended periods while harvesting sensitive data or preparing for more sophisticated attacks.
Mitigation strategies for CVE-2020-25466 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from emerging. The primary fix involves implementing strict input validation and sanitization for all parameters passed to the downloadimage interface, ensuring that only predefined, trusted sources are permitted for image downloads. Organizations should implement a whitelist approach for acceptable URL schemes and domains, rejecting any external requests that do not match predetermined criteria. Network-level protections such as firewalls and web application firewalls should be configured to block suspicious requests and monitor for patterns indicative of SSRF attempts. Additionally, the application should be configured to run with minimal privileges and implement proper access controls to limit the damage that can be caused even if exploitation occurs. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other application components. The remediation process should also include implementing proper logging and monitoring to detect suspicious activities related to file downloads and system access attempts. Organizations should also consider implementing the principle of least privilege, ensuring that the application's file system access is restricted to only necessary directories and operations. This vulnerability serves as a critical reminder of the importance of validating all external inputs and implementing robust security controls in web applications to prevent unauthorized access to server resources.