CVE-2020-23691 in YFCMF
Summary
by MITRE • 05/15/2021
YFCMF v2.3.1 has a Remote Command Execution (RCE) vulnerability in the index.php.
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Analysis
by VulDB Data Team • 05/16/2021
The vulnerability identified as CVE-2020-23691 affects YFCMF version 2.3.1 and represents a critical remote command execution flaw located within the index.php file of the application. This vulnerability allows attackers to execute arbitrary commands on the target system remotely without authentication, making it particularly dangerous for web applications that process user input through this specific endpoint. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly filter malicious payloads submitted through the application's interface.
From a technical perspective, the vulnerability manifests when the index.php script processes user-supplied parameters that are directly incorporated into system commands without adequate sanitization. This creates an environment where attackers can inject operating system commands through crafted input, effectively bypassing normal application security controls. The vulnerability aligns with CWE-77 which describes improper neutralization of special elements used in commands, and CWE-94 which addresses improper control of generation of code. The attack vector typically involves sending malicious payloads through HTTP request parameters that are then executed by the underlying operating system, potentially allowing full system compromise.
The operational impact of this vulnerability extends beyond simple command execution, as it can enable attackers to gain complete control over the affected server. Attackers may leverage this weakness to establish persistent backdoors, exfiltrate sensitive data, deploy additional malware, or use the compromised system as a launch point for further attacks within the network. The vulnerability affects the confidentiality, integrity, and availability of the targeted system, potentially leading to data breaches, service disruption, and regulatory compliance violations. Organizations running affected versions of YFCMF face significant risk exposure, particularly if the application is accessible from untrusted networks or has elevated privileges.
Mitigation strategies for CVE-2020-23691 should prioritize immediate patching of the affected YFCMF version to the latest secure release. System administrators must implement proper input validation and sanitization measures to prevent command injection attacks, including the use of parameterized queries and strict input filtering. Network segmentation and access controls should be enforced to limit exposure of the vulnerable application, while regular security audits and penetration testing can help identify similar vulnerabilities. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious activity related to command execution attempts. The remediation process should follow established security frameworks such as those outlined in the mitre ATT&CK framework, specifically addressing techniques related to command and scripting interpreter execution. Additionally, comprehensive logging and monitoring should be implemented to detect and respond to exploitation attempts, ensuring that any unauthorized command execution activities are promptly identified and mitigated.