CVE-2018-11208 in Z-BlogPHP
Summary
by MITRE
An issue was discovered in Z-BlogPHP 2.0.0. There is a persistent XSS that allows remote attackers to inject arbitrary web script or HTML into background web site settings via the "copyright information office" field. NOTE: the vendor indicates that the product was not intended to block this type of XSS by a user with the admin privilege
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/04/2024
The vulnerability CVE-2018-11208 represents a persistent cross-site scripting flaw in Z-BlogPHP version 2.0.0 that specifically targets the administrative interface of the content management system. This issue resides within the copyright information office field of the website settings, where user input is not properly sanitized or validated before being stored and subsequently rendered back to users. The vulnerability enables remote attackers to inject malicious scripts or HTML code that will persistently execute whenever the affected page is accessed, creating a significant security risk for administrators and other users who interact with the compromised system.
The technical nature of this vulnerability aligns with CWE-79, which describes cross-site scripting flaws where untrusted data is improperly incorporated into web pages without adequate validation or escaping mechanisms. The flaw occurs in the backend administrative settings where administrators can configure copyright information, making it particularly dangerous as it targets users with elevated privileges who are already trusted within the system. This persistent nature means that the malicious payload will execute every time the affected page is loaded, potentially allowing attackers to steal session cookies, perform unauthorized actions, or redirect users to malicious sites.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with a foothold for more sophisticated attacks within the compromised environment. When an administrator accesses the settings page containing the malicious input, the injected code executes in their browser context, potentially leading to privilege escalation or session hijacking. The vendor's statement that the product was not intended to block this type of XSS by users with admin privileges reveals a design oversight where the system assumes that administrators are trusted and will not inject malicious content, which is a dangerous assumption in modern security practices.
Security professionals should consider this vulnerability in the context of ATT&CK framework's T1059.001 technique for command and script injection, as well as T1566 for social engineering through malicious content. The persistence of the vulnerability means that it can serve as a foundation for further attacks, potentially allowing attackers to establish backdoors, exfiltrate sensitive data, or manipulate the content management system's functionality. Organizations using Z-BlogPHP 2.0.0 should immediately implement input sanitization measures, validate all user-supplied data, and consider implementing Content Security Policy headers to mitigate the risk of script execution.
Mitigation strategies should include immediate patching of the Z-BlogPHP software to the latest version that addresses this vulnerability, implementing proper input validation and output encoding for all administrative fields, and establishing regular security audits of administrative interfaces. Organizations should also consider implementing web application firewalls to detect and block suspicious script injection attempts, and conduct security training for administrators to recognize potential social engineering attempts that might exploit this vulnerability. The incident highlights the importance of defense in depth approaches where even trusted users within a system should be subject to input validation controls to prevent both malicious attacks and accidental security breaches.