CVE-2022-23906 in CMS Made Simple
Summary
by MITRE • 03/01/2022
CMS Made Simple v2.2.15 was discovered to contain a Remote Command Execution (RCE) vulnerability via the upload avatar function. This vulnerability is exploited via a crafted image file.
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Analysis
by VulDB Data Team • 03/04/2022
The vulnerability identified as CVE-2022-23906 represents a critical remote command execution flaw within CMS Made Simple version 2.2.15, specifically targeting the avatar upload functionality. This vulnerability falls under the CWE-434 category, which addresses insecure upload of executable files, and demonstrates how web applications can be compromised through improper file validation mechanisms. The flaw exists in the application's file upload handling process where user-supplied avatar images are not properly sanitized or validated before being processed by the server.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious image file that contains embedded executable code or leverages the application's image processing pipeline to execute arbitrary commands on the underlying server. The vulnerability exploits the lack of proper input validation and file type checking in the avatar upload feature, allowing attackers to bypass security measures that should prevent execution of malicious code. This type of vulnerability is particularly dangerous because it enables attackers to gain unauthorized access to the server environment and potentially escalate privileges to execute commands with the same permissions as the web application.
From an operational impact perspective, this vulnerability creates significant risk for organizations using CMS Made Simple v2.2.15, as it allows remote attackers to execute arbitrary commands on the affected system without requiring authentication. The exploitation can lead to complete system compromise, data theft, service disruption, and potential lateral movement within network environments. The vulnerability aligns with ATT&CK technique T1059, which covers command and scripting interpreter, and T1566, which involves phishing with malicious attachments, as attackers can leverage this vulnerability to establish persistent access and execute malicious payloads. Organizations may experience unauthorized access to sensitive data, modification of web content, and potential use of compromised systems for further attacks.
Mitigation strategies for this vulnerability should include immediate patching to version 2.2.16 or later, which contains the necessary fixes for the avatar upload validation. Additionally, implementing proper file validation mechanisms, restricting file upload types to known safe formats, and employing web application firewalls can help prevent exploitation. Organizations should also conduct thorough security assessments of their CMS Made Simple installations, review file upload permissions, and implement monitoring for suspicious file upload activities. The vulnerability demonstrates the importance of proper input validation and secure file handling practices, aligning with security best practices outlined in OWASP Top Ten and NIST cybersecurity frameworks. Regular security updates and vulnerability management processes are essential to prevent similar issues from occurring in the future.