CVE-2017-9288 in Raygun4WP Plugin
Summary
by MITRE
The Raygun4WP plugin 1.8.0 for WordPress is vulnerable to a reflected XSS in sendtesterror.php (backurl parameter).
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Analysis
by VulDB Data Team • 12/07/2022
The Raygun4WP plugin version 1.8.0 for WordPress presents a significant security vulnerability classified as reflected cross-site scripting within its sendtesterror.php component. This flaw specifically manifests through the backurl parameter, which fails to properly sanitize user input before incorporating it into the plugin's response. The vulnerability arises from the plugin's insufficient validation and encoding of parameters received from HTTP requests, creating an avenue for malicious actors to inject arbitrary JavaScript code that executes in the context of other users' browsers.
The technical implementation of this vulnerability stems from the plugin's failure to apply proper input sanitization mechanisms to the backurl parameter. When the sendtesterror.php script processes this parameter, it directly includes user-supplied data without adequate encoding or validation, allowing attackers to craft malicious URLs that, when clicked by unsuspecting users, trigger the execution of crafted JavaScript payloads. This reflected nature means that the malicious code is not stored on the server but rather injected through the request itself, making it particularly challenging to detect and prevent through traditional server-side security measures.
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, and redirection to malicious websites. An attacker could craft a phishing link that, when visited by an administrator or authenticated user, would execute malicious code to steal session cookies or redirect users to fraudulent sites designed to capture login credentials. The vulnerability is particularly concerning in WordPress environments where administrators often have elevated privileges and may be more likely to click on suspicious links, potentially leading to complete system compromise. This vulnerability aligns with CWE-79 which categorizes cross-site scripting flaws as a critical security weakness, and can be mapped to ATT&CK technique T1566.001 related to spearphishing via web links, demonstrating how such vulnerabilities can be exploited in real-world attack scenarios.
Mitigation strategies for this vulnerability should include immediate patching of the Raygun4WP plugin to version 1.8.1 or later, which contains the necessary fixes for the reflected XSS issue. Organizations should also implement input validation and output encoding mechanisms at multiple layers of their application architecture, ensuring that all parameters passed to web applications are properly sanitized before being processed or displayed. Network-based security controls such as web application firewalls can provide additional protection by detecting and blocking malicious payloads attempting to exploit this vulnerability. Regular security audits and vulnerability assessments should be conducted to identify similar issues in other plugins and themes, as the WordPress ecosystem has historically suffered from numerous XSS vulnerabilities due to inadequate input validation practices. Security monitoring should be enhanced to detect suspicious patterns in user agent strings and request parameters that may indicate exploitation attempts against known vulnerable components.