CVE-2018-20640 in Entrepreneur Job Portal Script
Summary
by MITRE
PHP Scripts Mall Entrepreneur Job Portal Script 3.0.1 has stored Cross-Site Scripting (XSS) via the Full Name field.
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Analysis
by VulDB Data Team • 08/03/2023
The vulnerability identified as CVE-2018-20640 affects PHP Scripts Mall Entrepreneur Job Portal Script version 3.0.1 and represents a stored cross-site scripting flaw that poses significant security risks to users of this job portal application. This type of vulnerability allows attackers to inject malicious scripts into the application's database through user input fields, which are then executed whenever other users view the affected content. The specific vector involves the Full Name field, which suggests that the application fails to properly sanitize or validate user input before storing it in the database and subsequently rendering it in web pages. Stored XSS vulnerabilities are particularly dangerous because the malicious code persists in the application's database and can affect multiple users over time, unlike reflected XSS which requires user interaction with a crafted link. The vulnerability stems from inadequate input validation and output encoding practices within the application's data handling processes.
The technical implementation of this vulnerability demonstrates a failure in the application's security controls at multiple layers of the web application architecture. When users submit their full names through the job portal interface, the application should validate and sanitize this input to prevent the injection of malicious script code. However, the Entrepreneur Job Portal Script 3.0.1 appears to store user input directly into the database without proper sanitization, creating an environment where attackers can embed malicious javascript code within the Full Name field. This flaw directly maps to CWE-79, which describes Cross-Site Scripting vulnerabilities where applications fail to properly encode output or validate input, allowing malicious scripts to be executed in the context of other users' browsers. The vulnerability can be exploited through various attack vectors including the injection of javascript code that could steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users.
The operational impact of this stored XSS vulnerability extends beyond simple data corruption or user inconvenience, as it can lead to serious security breaches and compromise of user data. Attackers who successfully exploit this vulnerability can potentially hijack user sessions, gain unauthorized access to sensitive information, or manipulate the job portal functionality to serve malicious content to other users. The persistent nature of stored XSS means that once the malicious payload is injected, it will continue to affect users who view the affected profiles or content until the vulnerability is patched and the malicious code is removed from the database. This vulnerability particularly affects the integrity and confidentiality of user data within the job portal environment, as users may unknowingly execute malicious scripts when viewing job listings or user profiles. The impact is further amplified in a job portal context where users may be accessing the system with varying levels of privileges and may be browsing content that could trigger the execution of malicious code, potentially leading to unauthorized access to job applications, personal information, or employer data.
Mitigation strategies for CVE-2018-20640 should focus on implementing proper input validation and output encoding mechanisms throughout the application's data flow. The most effective immediate solution involves sanitizing all user input, particularly in fields like Full Name, through the application of proper encoding techniques such as HTML entity encoding before storing data in the database. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded and executed within the browser context. The application should also implement proper input validation to reject or remove potentially malicious characters and patterns from user submissions. Organizations should also consider implementing a comprehensive web application firewall (WAF) that can detect and block known XSS attack patterns, though this should not be considered a substitute for proper application-level security controls. Regular security testing including automated vulnerability scanning and manual penetration testing should be conducted to identify similar vulnerabilities in other input fields and application components. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1059.007 for scripting and T1566 for phishing, as attackers can leverage this vulnerability to deliver malicious payloads to unsuspecting users and potentially escalate privileges through session hijacking or credential theft. The remediation process should also include proper security training for developers to ensure that input validation and output encoding practices are consistently applied across all application components.