CVE-2018-20639 in Entrepreneur Job Portal Script
Summary
by MITRE
PHP Scripts Mall Entrepreneur Job Portal Script 3.0.1 has HTML injection via the Search Bar.
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Analysis
by VulDB Data Team • 08/03/2023
The vulnerability identified as CVE-2018-20639 affects PHP Scripts Mall Entrepreneur Job Portal Script version 3.0.1, representing a critical security flaw that allows attackers to inject malicious HTML content through the application's search functionality. This issue stems from inadequate input validation and sanitization mechanisms within the search bar component, creating an avenue for cross-site scripting attacks that can compromise user sessions and data integrity.
The technical implementation of this vulnerability resides in the manner the application processes user input from the search field without proper sanitization or encoding of special characters. When users submit search queries containing HTML tags or JavaScript code, the application fails to properly escape or filter these inputs before rendering them in the response, allowing malicious payloads to be executed within the context of other users' browsers. This weakness directly corresponds to CWE-79 which categorizes cross-site scripting vulnerabilities as a result of insufficient input validation and output encoding. The vulnerability operates at the application layer where user-supplied data flows through the system without adequate security controls to prevent malicious code execution.
The operational impact of this HTML injection vulnerability extends beyond simple data corruption, as it enables attackers to perform session hijacking, steal cookies, redirect users to malicious websites, or even execute arbitrary JavaScript code within the victim's browser context. An attacker could exploit this vulnerability by submitting crafted search terms containing HTML tags or script elements that would be rendered on the page, potentially compromising user accounts, stealing sensitive information, or defacing the job portal website. This type of attack aligns with ATT&CK technique T1059.001 which describes the use of scripting languages for execution and persistence within compromised systems.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's codebase. The most effective approach involves sanitizing all user inputs through proper HTML escaping and encoding before rendering any content in web responses, specifically targeting the search functionality where the vulnerability manifests. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against malicious script execution, while regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities in other application components. The remediation process should also include proper error handling and logging to detect potential exploitation attempts, ensuring that the application maintains a secure state even when processing potentially malicious input from users.