CVE-2021-26786 in PlayTube
Summary
by MITRE • 11/03/2021
An issue was discoverered in in customercentric-selling-poland PlayTube, allows authenticated attackers to execute arbitrary code via the purchace code to the config.php.
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Analysis
by VulDB Data Team • 11/09/2021
The vulnerability identified as CVE-2021-26786 represents a critical remote code execution flaw within the customercentric-selling-poland PlayTube platform. This issue affects authenticated users who can leverage a specially crafted purchase code parameter to inject malicious code into the config.php file, thereby gaining unauthorized system access. The vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly filter user-supplied data before processing it within the application's configuration handling routines.
The technical implementation of this flaw involves the improper handling of the purchase code parameter which is directly incorporated into the config.php file without adequate security measures. When an authenticated attacker submits a malicious purchase code, the system processes this input without sufficient validation, allowing arbitrary code execution within the context of the web application. This represents a classic path traversal and code injection vulnerability that aligns with CWE-94, which specifically addresses "Improper Control of Generation of Code ('Code Injection')." The vulnerability exists at the intersection of input validation failure and privilege escalation, as it requires authentication but then allows for full system compromise.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. An authenticated attacker with access to the purchase code functionality can execute arbitrary commands on the target system, potentially leading to unauthorized data access, system modification, or even complete system takeover. This vulnerability directly maps to ATT&CK technique T1059.001, "Command and Scripting Interpreter: PowerShell," and T1059.007, "Command and Scripting Interpreter: JavaScript," as attackers can leverage this vulnerability to execute malicious scripts within the target environment. The compromise of config.php represents a particularly dangerous attack vector because configuration files typically contain sensitive system parameters and database credentials that can facilitate further lateral movement within the network.
Mitigation strategies for CVE-2021-26786 must address both the immediate code injection vulnerability and broader security practices within the PlayTube platform. Organizations should implement comprehensive input validation and sanitization measures that filter all user-supplied data before processing, particularly for parameters that interact with system configuration files. The application should employ proper parameterized queries and input escaping mechanisms to prevent code injection attacks. Additionally, implementing principle of least privilege access controls and mandatory access controls for configuration file modifications can significantly reduce the attack surface. Security patches should be applied immediately to address the specific vulnerability in the purchase code handling logic, and organizations should conduct thorough code reviews to identify similar patterns of insecure input handling throughout the application. Network segmentation and monitoring solutions should be deployed to detect anomalous code execution patterns and unauthorized modifications to critical system files. The vulnerability also highlights the importance of regular security assessments and vulnerability scanning to identify similar issues in other components of the system architecture, particularly those involving configuration file manipulation and user input processing functions.