CVE-2022-36226 in SiteServer
Summary
by MITRE • 08/26/2022
SiteServerCMS 5.X has a Remote-download-Getshell-vulnerability via /SiteServer/Ajax/ajaxOtherService.aspx.
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Analysis
by VulDB Data Team • 10/02/2022
The vulnerability identified as CVE-2022-36226 affects SiteServer CMS version 5.x and represents a critical remote code execution flaw that allows attackers to achieve unauthorized system compromise through a remote download and getshell mechanism. This vulnerability specifically targets the /SiteServer/Ajax/ajaxOtherService.aspx endpoint, which serves as an entry point for malicious actors to upload and execute arbitrary code on affected systems. The flaw stems from insufficient input validation and improper access controls within the CMS's ajax service implementation, creating a pathway for remote attackers to bypass authentication mechanisms and gain full control over the affected server infrastructure.
The technical exploitation of this vulnerability occurs through the manipulation of parameters within the ajaxOtherService.aspx handler, which processes file download requests without adequate sanitization of user-supplied inputs. Attackers can leverage this weakness to upload malicious files to the server and subsequently execute them as web shell components, effectively establishing persistent access to the compromised system. This vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of a file upload vulnerability that enables remote code execution. The attack vector operates through HTTP requests that target the specific endpoint, making it particularly dangerous as it can be exploited from any location without requiring physical access to the network.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with complete control over the affected CMS installation and underlying server infrastructure. Once exploited, adversaries can perform various malicious activities including data exfiltration, system reconnaissance, privilege escalation, and establishment of persistent backdoors. The vulnerability affects organizations using SiteServer CMS 5.x versions, which may include government agencies, educational institutions, and enterprise organizations that rely on this content management system for their web presence. The remote nature of the exploit means that attackers can target vulnerable systems from anywhere on the internet, making this vulnerability particularly dangerous for organizations that do not maintain proper network segmentation or monitoring controls.
Organizations should implement immediate mitigations including applying the latest security patches provided by SiteServer CMS vendors, implementing network-level restrictions to limit access to the vulnerable endpoint, and deploying web application firewalls to detect and block malicious requests targeting the specific ajaxOtherService.aspx handler. The mitigation strategy should also include comprehensive network monitoring to detect unusual file upload activities and unauthorized access attempts. Security teams must conduct thorough vulnerability assessments to identify all instances of SiteServer CMS 5.x installations within their environments and ensure proper access controls are implemented. Additionally, organizations should consider implementing the principle of least privilege for web application accounts and regularly audit file upload functionalities to prevent similar vulnerabilities from being introduced in the future. This vulnerability demonstrates the critical importance of maintaining up-to-date security patches and proper input validation in web applications, as it represents a clear violation of secure coding practices and provides attackers with a straightforward path to system compromise. The attack pattern associated with this vulnerability aligns with ATT&CK technique T1190, which covers exploitation of remote services, and T1078, which addresses valid accounts usage, as attackers can leverage legitimate administrative functions to achieve their objectives.