CVE-2015-9363 in iThemes Exchange
Summary
by MITRE
iThemes Exchange before 1.12.0 for WordPress has XSS via add_query_arg() and remove_query_arg().
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Analysis
by VulDB Data Team • 12/07/2023
The vulnerability identified as CVE-2015-9363 affects the iThemes Exchange plugin for WordPress, specifically versions prior to 1.12.0. This issue represents a cross-site scripting vulnerability that arises from improper handling of query arguments within the plugin's codebase. The vulnerability stems from the use of add_query_arg() and remove_query_arg() functions without adequate sanitization or validation of user-supplied input, creating an avenue for malicious actors to inject arbitrary JavaScript code into web pages viewed by other users.
The technical flaw manifests when the plugin processes URL parameters through the WordPress functions add_query_arg() and remove_query_arg() without implementing proper input validation or output encoding mechanisms. These functions are designed to manipulate query strings in URLs, but when used inappropriately within the plugin's code, they fail to sanitize user-provided data that gets reflected back to users. This creates a classic XSS vulnerability where an attacker can craft malicious URLs containing JavaScript payloads that execute in the context of other users' browsers who visit pages containing these manipulated query parameters.
The operational impact of this vulnerability is significant within WordPress environments that utilize the iThemes Exchange plugin. Attackers can exploit this weakness to perform session hijacking, steal user credentials, deface websites, or redirect users to malicious domains. The vulnerability affects any user who interacts with pages that process query arguments through the vulnerable plugin functions, making it particularly dangerous in multi-user environments where administrators and regular users may be targeted. The reflected nature of the XSS means that the malicious code executes immediately when users navigate to compromised pages, without requiring any additional user interaction beyond visiting the malicious URL.
Mitigation strategies for this vulnerability include immediately upgrading to iThemes Exchange version 1.12.0 or later, which contains the necessary patches to address the XSS issue. System administrators should also implement proper input validation and output encoding practices throughout their WordPress installations, ensuring that all user-supplied data is sanitized before being processed or displayed. Additionally, implementing content security policies can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be executed. Organizations should follow CWE-79 guidelines for cross-site scripting prevention and consider implementing web application firewalls to detect and block malicious query parameter injection attempts. The vulnerability aligns with ATT&CK technique T1203, which involves exploiting web application vulnerabilities to gain access to user sessions and execute malicious code within the victim's browser context.