CVE-2020-21652 in Myucms
Summary
by MITRE • 10/07/2021
Myucms v2.2.1 contains a remote code execution (RCE) vulnerability in the component \controller\Config.php, which can be exploited via the addqq() method.
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Analysis
by VulDB Data Team • 10/10/2021
The vulnerability identified as CVE-2020-21652 represents a critical remote code execution flaw within Myucms version 2.2.1, specifically affecting a designated component of the content management system. This vulnerability stems from inadequate input validation and sanitization mechanisms that permit malicious actors to inject and execute arbitrary code on the affected system. The flaw exists in the way the application processes user-supplied data, creating an exploitable path for attackers to bypass security controls and gain unauthorized access to the underlying server infrastructure. Security researchers have identified that this vulnerability can be leveraged to establish persistent access, escalate privileges, and potentially compromise the entire web application environment.
The technical exploitation of this RCE vulnerability typically involves crafting malicious payloads that exploit the insecure data handling within the targeted component. Attackers can manipulate input fields, parameters, or file upload mechanisms to inject shell commands or malicious code that executes with the privileges of the web application. This vulnerability aligns with CWE-94, which categorizes improper control of generation of code, representing a fundamental flaw in how the application handles dynamic code execution. The vulnerability may also map to ATT&CK technique T1059.001, which covers command and scripting interpreter, as attackers can leverage the RCE capability to execute commands directly on the compromised system.
The operational impact of this vulnerability extends beyond simple code execution, potentially enabling attackers to establish backdoors, exfiltrate sensitive data, modify content, or use the compromised system as a launch point for further attacks within the network infrastructure. Organizations running Myucms v2.2.1 are at significant risk of unauthorized access, data breaches, and potential system compromise. The vulnerability's remote nature means that exploitation can occur from anywhere on the internet without requiring physical access to the network, making it particularly dangerous for organizations that do not maintain robust network segmentation or monitoring controls.
Mitigation strategies for CVE-2020-21652 should include immediate application of vendor-provided patches or updates that address the input validation and sanitization deficiencies. Organizations should implement network-level controls such as web application firewalls to detect and block malicious payloads targeting this vulnerability. Regular security assessments and penetration testing should be conducted to identify similar weaknesses in other components of the application stack. Additionally, implementing proper input validation, output encoding, and least privilege access controls can significantly reduce the attack surface and limit the potential impact of such vulnerabilities. Security teams should also monitor for indicators of compromise and maintain incident response procedures specifically tailored to handle RCE vulnerabilities in content management systems.