CVE-2018-14937 in My Little Forum
Summary
by MITRE
The Add page option in my little forum 2.4.12 allows XSS via the Menu Link field.
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Analysis
by VulDB Data Team • 03/13/2020
The vulnerability identified as CVE-2018-14937 represents a cross-site scripting flaw within my little forum version 2.4.12 that specifically affects the Add page functionality. This issue resides in the Menu Link field processing mechanism, where user input is not properly sanitized or validated before being rendered back to users. The vulnerability enables attackers to inject malicious scripts that execute in the context of other users' browsers when they access the affected forum pages. The flaw demonstrates a classic input validation weakness that falls under the category of insecure data handling within web applications.
The technical implementation of this vulnerability stems from inadequate output encoding and input sanitization practices within the forum's administrative interface. When administrators or authorized users create menu links through the Add page option, the system fails to properly escape or filter special characters that could be interpreted as HTML or JavaScript code. This allows an attacker to craft malicious input containing script tags or other executable code that gets stored and subsequently executed when other users browse the forum's navigation elements. The vulnerability specifically targets the Menu Link field, which is typically used to define URLs or navigation paths within the forum's interface.
From an operational perspective, this XSS vulnerability presents significant risks to forum administrators and users who may be tricked into clicking maliciously crafted menu links. The impact extends beyond simple script execution as it can potentially enable session hijacking, credential theft, or redirection to malicious sites. Attackers could exploit this vulnerability to steal user sessions, modify forum content, or escalate privileges within the application. The vulnerability is particularly concerning in multi-user environments where administrators may have elevated privileges and whose sessions could be compromised. According to CWE guidelines, this represents a CWE-79: Cross-site Scripting vulnerability, which is categorized under the broader category of injection flaws that affect web applications.
The exploitation of CVE-2018-14937 aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to initial access and privilege escalation. Attackers may leverage this vulnerability as part of a broader attack chain to establish persistent access to the forum environment. The vulnerability could be used to deliver malware payloads or redirect users to phishing sites that attempt to harvest credentials. Security practitioners should consider this vulnerability in the context of web application security assessments and implement proper input validation measures to prevent similar issues in other applications.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and output encoding mechanisms throughout the application. The forum should sanitize all user inputs, particularly those that are rendered in HTML contexts, by applying proper HTML escaping techniques and validating input against expected formats. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be executed. Regular security updates and patch management processes are essential to address such vulnerabilities, as they represent a common class of flaws that attackers frequently target in web applications. The vulnerability also underscores the importance of proper security testing including dynamic application security testing and manual penetration testing to identify and remediate similar issues before they can be exploited in production environments.