CVE-2020-24314 in RSS Feed Widget Plugin
Summary
by MITRE
Fahad Mahmood RSS Feed Widget Plugin v2.7.9 and lower does not sanitize the value of the "t" GET parameter before echoing it back out inside an input tag. This results in a reflected XSS vulnerability that attackers can exploit with a specially crafted URL.
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Analysis
by VulDB Data Team • 08/26/2020
The vulnerability identified as CVE-2020-24314 affects the Fahad Mahmood RSS Feed Widget plugin version 2.7.9 and earlier, representing a critical security flaw that exposes users to reflected cross-site scripting attacks. This issue stems from inadequate input validation and sanitization within the plugin's handling of HTTP GET parameters, specifically targeting the "t" parameter that is processed and subsequently rendered in an HTML input element. The vulnerability manifests when malicious actors craft URLs containing specially formatted payloads that exploit the lack of proper sanitization mechanisms. The affected plugin fails to properly escape or filter user-supplied data before incorporating it into dynamic HTML output, creating an avenue for attackers to inject malicious scripts that execute in the context of other users' browsers. This vulnerability directly violates security best practices outlined in the OWASP Top Ten and aligns with CWE-79, which specifically addresses cross-site scripting flaws where untrusted data is improperly incorporated into web pages without adequate sanitization or escaping. The reflected nature of this XSS vulnerability means that the malicious payload is reflected back to users through the vulnerable input parameter, making it particularly dangerous as it can be delivered via email links, malicious websites, or other attack vectors that direct users to specifically crafted URLs. The impact extends beyond simple script execution as attackers can leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious sites, or harvest sensitive information from authenticated sessions. The vulnerability's exploitation requires minimal user interaction since simply visiting a maliciously crafted URL containing the XSS payload is sufficient to trigger the attack, making it particularly dangerous in phishing scenarios or when embedded in compromised websites.
The technical implementation of this vulnerability occurs within the plugin's processing logic where the "t" GET parameter is directly incorporated into an HTML input element without proper sanitization or escaping. When a user accesses a URL containing the malicious parameter, the plugin retrieves this value and echoes it directly into the page's HTML structure, creating a reflected XSS condition. This flaw demonstrates a classic failure in input validation and output encoding practices, where the plugin assumes that user input is safe and does not implement proper security measures to prevent malicious data from being executed as code. The vulnerability specifically impacts the plugin's handling of the "t" parameter within an input tag context, which provides attackers with a direct path to inject JavaScript code that executes in the victim's browser context. The issue can be exploited across different browsers and operating systems since the vulnerability exists at the web application level rather than being dependent on specific client-side configurations. The reflected nature of the vulnerability means that the malicious script is not stored on the server but is instead injected through the HTTP request itself, making it difficult to detect through traditional server-side scanning methods and requiring real-time monitoring of user interactions.
The operational impact of CVE-2020-24314 extends beyond simple script injection to potentially compromise entire user sessions and enable advanced persistent threats against WordPress installations. Attackers can leverage this vulnerability to execute malicious scripts that steal authentication tokens, session cookies, or other sensitive user information, effectively allowing unauthorized access to user accounts and administrative functions. The vulnerability also enables attackers to redirect users to malicious websites, modify page content, or perform actions on behalf of authenticated users through the exploitation of the reflected XSS condition. This makes the vulnerability particularly dangerous for websites that rely on user authentication or contain sensitive information, as it provides attackers with a direct path to compromise user accounts and potentially gain administrative privileges. The attack vector is particularly concerning because it requires no special privileges or complex exploitation techniques beyond crafting a malicious URL, making it accessible to attackers with minimal technical expertise. The vulnerability can be exploited in various scenarios including targeted phishing campaigns, where attackers send malicious links to specific users, or through compromised websites where the malicious payload is embedded in legitimate-looking content. Organizations using the affected plugin version face significant risk of data breaches, unauthorized access, and potential compromise of their entire WordPress installation if proper mitigation measures are not implemented immediately.
Mitigation strategies for CVE-2020-24314 must address both immediate remediation and long-term security hardening measures to prevent exploitation of this reflected XSS vulnerability. The most effective immediate solution involves upgrading to a patched version of the Fahad Mahmood RSS Feed Widget plugin that properly sanitizes input parameters before rendering them in HTML output. Organizations should also implement proper input validation and output encoding mechanisms that escape special characters in user-supplied data before incorporating it into HTML elements. The implementation of Content Security Policy (CSP) headers can provide additional protection by restricting the sources from which scripts can be loaded and executed, making it more difficult for attackers to successfully exploit reflected XSS vulnerabilities. Regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other plugins or custom code within the WordPress installation. Web Application Firewall (WAF) rules can be implemented to detect and block known malicious patterns associated with this vulnerability, providing an additional layer of protection while awaiting official patches. Organizations should also consider implementing proper logging and monitoring to detect suspicious user behavior or attempts to access malicious URLs that may indicate exploitation attempts. Security awareness training for administrators and users can help prevent successful exploitation through social engineering attacks that rely on users clicking on malicious links. The vulnerability highlights the importance of keeping all WordPress plugins and themes updated to their latest versions, as outdated software represents one of the most common attack vectors for web application exploitation. Regular vulnerability scanning and penetration testing should be conducted to identify similar input validation flaws across the entire web application stack. The implementation of proper error handling and user input sanitization practices should be enforced throughout the development lifecycle to prevent similar vulnerabilities from being introduced in custom code or third-party components.