CVE-2017-18498 in simple-job-board Plugin
Summary
by MITRE
The simple-job-board plugin before 2.4.4 for WordPress has reflected XSS via keyword search.
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Analysis
by VulDB Data Team • 11/23/2023
The vulnerability identified as CVE-2017-18498 affects the simple-job-board plugin for WordPress, specifically versions prior to 2.4.4, and represents a reflected cross-site scripting flaw that poses significant security risks to affected websites. This vulnerability resides within the plugin's keyword search functionality, where user input is not properly sanitized or escaped before being returned to the browser. The reflected nature of this XSS vulnerability means that an attacker can craft malicious URLs containing crafted script payloads that will be executed in the context of a victim's browser when the victim clicks on the link or visits the malicious page. The vulnerability specifically impacts the search feature of the job board plugin, where keywords entered by users are directly reflected back in the page response without adequate input validation or output encoding measures.
The technical exploitation of this vulnerability follows the standard reflected XSS attack pattern where malicious input is embedded within the URL parameters and subsequently rendered in the web page response. When a user performs a search using the job board plugin, the keyword parameter is processed and displayed in the search results page without proper sanitization. This creates an opportunity for attackers to inject malicious JavaScript code through the search functionality, which gets executed when other users browse the affected pages. The vulnerability demonstrates poor input handling practices and inadequate output encoding mechanisms that are fundamental to preventing XSS attacks. According to CWE standards, this vulnerability maps to CWE-79 which specifically addresses Cross-site Scripting flaws, and more specifically to CWE-74 which deals with Improper Neutralization of Special Elements in Output Used by a Downstream Component.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, redirection to malicious sites, and data exfiltration. An attacker could exploit this vulnerability to steal administrator sessions, inject malicious content into job listings, or redirect users to phishing sites that mimic legitimate job boards. The attack surface is particularly concerning given that job board websites often contain sensitive information about job seekers and employers, making them attractive targets for cybercriminals seeking to exploit user trust. The reflected nature of the vulnerability means that attacks can be delivered through social engineering tactics, where users are tricked into clicking malicious links that contain crafted search parameters. This vulnerability aligns with ATT&CK technique T1566.001 which covers Phishing via Social Media, as attackers could leverage the job board's search functionality to deliver malicious payloads through deceptive social media posts or email campaigns.
Mitigation strategies for this vulnerability require immediate patching of the simple-job-board plugin to version 2.4.4 or later, which contains the necessary fixes to properly sanitize user input and escape output before rendering. Organizations should also implement additional defensive measures such as Content Security Policy (CSP) headers to limit script execution capabilities, input validation at multiple layers, and regular security audits of WordPress plugins. The vulnerability highlights the critical importance of proper input validation and output encoding practices in web applications, as recommended by OWASP Top 10 and the Web Application Security Consortium guidelines. Security teams should also monitor for similar vulnerabilities in other plugins and themes, as reflected XSS vulnerabilities are common in WordPress environments where plugins fail to properly sanitize user input. Regular security assessments and automated vulnerability scanning should be implemented to identify and remediate similar issues before they can be exploited by malicious actors in the wild.