CVE-2014-8087 in Post Highlights Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the post highlights plugin before 2.6.1 for WordPress allows remote attackers to inject arbitrary web script or HTML via the txt parameter in a headline action to ajax/ph_save.php.
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Analysis
by VulDB Data Team • 11/25/2019
The CVE-2014-8087 vulnerability represents a critical cross-site scripting flaw within the post highlights plugin for WordPress systems prior to version 2.6.1. This security weakness resides in the plugin's handling of user input through the txt parameter within the ajax/ph_save.php endpoint, creating an exploitable vector for remote attackers to execute malicious code within the context of affected websites. The vulnerability specifically targets the plugin's ajax functionality where user-provided content is processed without adequate sanitization or validation, allowing attackers to inject arbitrary web scripts or HTML code that can be executed by other users accessing the affected WordPress installation.
The technical exploitation of this vulnerability occurs through the manipulation of the txt parameter in a headline action request directed to the ajax/ph_save.php file. When a user submits content through the plugin's interface, the txt parameter containing potentially malicious input bypasses the plugin's input validation mechanisms. This flaw stems from inadequate output encoding and input sanitization practices within the plugin's codebase, where user-supplied data flows directly into the page output without proper HTML escaping or context-appropriate encoding. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as a reflected XSS attack where malicious payloads are injected into the application's response to the user's request.
The operational impact of CVE-2014-8087 extends beyond simple script injection, as successful exploitation can enable attackers to perform various malicious activities including session hijacking, defacement of website content, redirection to malicious sites, and data theft from authenticated users. When a victim visits a page containing the injected malicious script, the code executes within their browser context, potentially stealing cookies, modifying content, or redirecting users to phishing sites. The vulnerability is particularly dangerous in WordPress environments where administrators and editors may be logged in, as the malicious scripts can execute with elevated privileges, potentially allowing attackers to modify content, create new user accounts, or even install malware. The attack vector is easily accessible to remote adversaries, requiring only a simple HTTP request with crafted parameters to exploit the vulnerability.
Mitigation strategies for CVE-2014-8087 focus primarily on immediate plugin updates to version 2.6.1 or later, which includes proper input sanitization and output encoding mechanisms. Organizations should implement comprehensive input validation measures that filter and sanitize all user-provided data before processing, ensuring that any potentially malicious content is neutralized before being stored or displayed. The implementation of 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. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other plugins and themes, while maintaining up-to-date WordPress core installations and plugins helps prevent exploitation of known vulnerabilities. Security practitioners should also consider implementing web application firewalls that can detect and block suspicious parameter values, particularly those containing common XSS payload patterns, and establish monitoring protocols to detect unauthorized modifications to website content or unexpected user behavior patterns that may indicate exploitation attempts.