CVE-2020-15431: 
Control Web Panel vulnerability analysis and mitigation

CentOS Web Panel (cwp-e17.0.9.8.923) contained a critical remote code execution vulnerability that allows remote attackers to execute arbitrary code. The vulnerability was discovered in January 2020 and publicly disclosed on June 25, 2020, after the vendor failed to provide a patch within the 120-day disclosure deadline (ZDI Advisory).

The vulnerability exists within the ajax_crons.php file of CentOS Web Panel. The specific flaw occurs when parsing the user parameter, where the process fails to properly validate user-supplied strings before using them in system calls. The vulnerability has been assigned a CVSS score of 9.8 (Critical) with the following vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network accessibility, low attack complexity, and no required privileges or user interaction (ZDI Advisory).

The vulnerability allows attackers to execute code in the context of root, potentially leading to complete system compromise. No authentication is required to exploit this vulnerability, making it particularly severe (ZDI Advisory).

The vulnerability was disclosed as a zero-day, meaning it was publicly revealed without an available patch. The ease of exploitation is considered high due to the lack of required authentication and the straightforward nature of the command injection vulnerability (ZDI Advisory).

The recommended mitigation strategy is to restrict interaction with the service to trusted machines only. This can be implemented through firewall rules and whitelisting to ensure that only clients and servers with legitimate procedural relationships can communicate with the service (ZDI Advisory).

The vulnerability was discovered and reported by security researchers @PaulosYibelo and CasperTea through the Zero Day Initiative program. Despite multiple status update requests between January and June 2020, the vendor did not respond or provide patches (ZDI Advisory).