CVE-2017-20036 in PHPList
Summary
by MITRE • 06/10/2022
A vulnerability, which was classified as problematic, was found in PHPList 3.2.6. Affected is an unknown function of the file /lists/admin/ of the component Bounce Rule. The manipulation leads to cross site scripting (Persistent). It is possible to launch the attack remotely. Upgrading to version 3.3.1 is able to address this issue. It is recommended to upgrade the affected component.
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Analysis
by VulDB Data Team • 11/22/2022
This vulnerability in PHPList 3.2.6 represents a persistent cross site scripting flaw that resides within the bounce rule functionality of the administrative interface. The issue manifests in the /lists/admin/ directory where an improperly validated input field allows attackers to inject malicious scripts that persist in the application's database and execute whenever the affected page is loaded. The vulnerability classification as problematic indicates a significant security risk that could enable attackers to execute arbitrary code within the context of users' browsers. This type of vulnerability falls under CWE-79 which specifically addresses cross site scripting flaws in web applications where user-supplied data is not properly sanitized before being rendered back to users. The attack vector is remote, meaning that an attacker can exploit this vulnerability without requiring physical access to the system or direct network interaction with the target server, as the malicious payload is stored and executed through the persistent nature of the vulnerability.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the capability to perform session hijacking, steal sensitive user credentials, redirect users to malicious domains, or even inject additional malware into the victim's browser environment. The persistent nature of the XSS vulnerability means that once the malicious script is stored in the database through the vulnerable bounce rule function, it will continue to execute for any user who views the affected administrative page. This characteristic makes the vulnerability particularly dangerous in multi-user environments where administrators frequently access the bounce rule management interface. The vulnerability directly maps to attack techniques described in the ATT&CK framework under T1566 which covers social engineering tactics, specifically the use of malicious payloads delivered through web interfaces. The fact that this vulnerability affects the administrative component of PHPList makes it especially concerning as successful exploitation could provide attackers with elevated privileges and access to sensitive mailing list data and user information.
The remediation strategy involves upgrading to PHPList version 3.3.1 or later, which includes proper input sanitization and output encoding mechanisms that prevent the injection of malicious scripts into the bounce rule management interface. Security practitioners should also implement additional protective measures such as input validation at multiple layers, regular security audits of administrative interfaces, and monitoring for suspicious activities in the bounce rule processing functionality. Organizations should consider implementing web application firewalls to detect and block potential XSS payloads before they can be stored in the database, while also ensuring that proper access controls are in place to limit who can modify bounce rules within the system. The vulnerability demonstrates the critical importance of proper data validation and output encoding in web applications, particularly within administrative interfaces where the potential for privilege escalation exists. Additionally, regular security assessments of third-party components and timely patch management processes are essential to prevent exploitation of known vulnerabilities that could otherwise compromise entire email distribution systems.