CVE-2020-9393 in pricing-table-by-supsystic Plugin
Summary
by MITRE
An issue was discovered in the pricing-table-by-supsystic plugin before 1.8.2 for WordPress. It allows XSS.
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Analysis
by VulDB Data Team • 04/06/2024
The vulnerability identified as CVE-2020-9393 affects the pricing-table-by-supsystic WordPress plugin, specifically versions prior to 1.8.2, presenting a cross-site scripting vulnerability that poses significant security risks to affected websites. This issue stems from insufficient input validation and output escaping mechanisms within the plugin's codebase, allowing malicious actors to inject malicious scripts into web pages viewed by other users. The vulnerability specifically impacts the plugin's handling of user-supplied data in pricing table configurations and related administrative interfaces.
The technical flaw manifests when the plugin fails to properly sanitize and escape user input before rendering it in HTML output contexts. Attackers can exploit this weakness by crafting malicious payloads that are stored within the plugin's data structures and subsequently executed in the browsers of unsuspecting users who visit affected pages. The vulnerability falls under CWE-79, which categorizes cross-site scripting flaws as a critical security weakness in web applications. This weakness enables attackers to execute arbitrary JavaScript code in the context of the victim's browser, potentially leading to session hijacking, credential theft, or redirection to malicious websites.
The operational impact of this vulnerability extends beyond simple script execution, as it can be leveraged for more sophisticated attacks within the targeted WordPress environment. An attacker could exploit the XSS vulnerability to steal administrator cookies, modify content, or inject additional malicious scripts that persist across user sessions. The vulnerability affects the plugin's administrative dashboard functionality where users configure pricing tables, making it particularly dangerous for sites where multiple administrators or contributors have access. The attack surface is broadened as the vulnerability affects not only the plugin's front-end display but also its back-end administrative interfaces where users enter pricing data and configuration parameters.
Mitigation strategies for CVE-2020-9393 primarily involve immediate plugin updates to version 1.8.2 or later, which contain the necessary patches to address the input sanitization issues. Administrators should also implement additional security measures such as input validation at multiple layers, output escaping for all dynamic content, and regular security auditing of installed plugins. The vulnerability demonstrates the importance of proper security practices in WordPress plugin development, particularly around handling user input and ensuring proper context-aware escaping. Security teams should monitor for related attack patterns in their network logs and implement web application firewalls to detect and block malicious payloads targeting similar XSS vulnerabilities. Organizations should also consider implementing content security policies to further protect against script injection attacks, as outlined in the ATT&CK framework's technique for command and control communications through web application vulnerabilities.