CVE-2024-43329 in Allegiant Plugin
Summary
by MITRE • 08/18/2024
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WP Chill Allegiant allegiant allows Stored XSS.This issue affects Allegiant: from n/a through 1.2.7.
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Analysis
by VulDB Data Team • 03/14/2025
This vulnerability represents a critical cross-site scripting flaw in the WP Chill Allegiant plugin, specifically targeting the web page generation process where input validation and sanitization mechanisms fail to properly neutralize malicious user-supplied data. The vulnerability falls under the category of stored cross-site scripting attacks where malicious scripts are permanently stored on the server and executed whenever users access affected pages. The issue affects all versions of the Allegiant plugin from the initial release through version 1.2.7, indicating a long-standing flaw that has not been adequately addressed. This type of vulnerability enables attackers to inject malicious code that persists in the application's database, making it particularly dangerous as it can affect multiple users over time.
The technical exploitation of this vulnerability occurs when user input is not properly sanitized before being rendered in web pages, allowing attackers to inject malicious JavaScript code into the application's output. When other users view pages containing this malicious content, their browsers execute the injected scripts, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victims. The flaw specifically manifests during the web page generation phase where the application fails to implement adequate input filtering or output encoding mechanisms. This vulnerability maps directly to CWE-79 which defines the improper neutralization of input during web page generation as a core weakness leading to XSS attacks. The persistence of this vulnerability across multiple versions suggests inadequate security testing or insufficient attention to input validation during the plugin's development lifecycle.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with a foothold for more sophisticated attacks within the compromised environment. An attacker could potentially steal administrator credentials, modify content, redirect users to malicious sites, or perform actions that compromise the entire WordPress installation. The stored nature of the XSS attack means that the malicious payload remains active even after the initial injection, creating a persistent threat vector that can be exploited by multiple users over extended periods. This vulnerability particularly affects WordPress environments where the Allegiant plugin is installed, potentially compromising thousands of sites if the plugin is widely used. The attack surface includes any functionality within the plugin that accepts user input and displays it on web pages, making it a high-risk vulnerability that could lead to complete system compromise.
Mitigation strategies should focus on immediate input sanitization and output encoding measures to prevent malicious code execution. Administrators should upgrade to the latest version of the Allegiant plugin where this vulnerability has been patched, as version 1.2.7 appears to be the last affected release. The implementation of Content Security Policy headers can provide additional defense-in-depth measures to prevent script execution, while proper input validation and sanitization should be enforced at all points where user data enters the application. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other plugins and themes. Organizations should also consider implementing web application firewalls to detect and block malicious script injection attempts, and maintain comprehensive monitoring to identify potential exploitation attempts. This vulnerability aligns with ATT&CK technique T1566 which covers social engineering through malicious content, and T1059 which covers command and scripting interpreter techniques, making it a significant threat vector requiring immediate remediation.