CVE-2024-11359 in Library Bookshelves Plugin
Summary
by MITRE • 12/12/2024
The Library Bookshelves plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 5.8. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 02/18/2025
The CVE-2024-11359 vulnerability affects the Library Bookshelves plugin for WordPress, representing a critical security flaw that exposes websites to reflected cross-site scripting attacks. This vulnerability exists within the plugin's handling of URL parameters, specifically through the improper use of the add_query_arg function without adequate escaping mechanisms. The flaw impacts all versions up to and including 5.8, making it a widespread concern for WordPress administrators who have not yet updated their installations. The vulnerability stems from the plugin's failure to properly sanitize user-supplied input that gets reflected back in the HTTP response, creating an avenue for malicious actors to execute arbitrary scripts in the context of a victim's browser.
The technical nature of this vulnerability allows attackers to craft malicious URLs that, when clicked by an unsuspecting user, will execute injected scripts in the victim's browser. This occurs because the plugin does not implement proper output escaping when processing URL parameters through the add_query_arg function. The reflected nature of the vulnerability means that the malicious script is injected into the response by the web server, which then reflects it back to the user. This type of vulnerability falls under CWE-79, which specifically addresses Cross-Site Scripting flaws in web applications. The attack vector requires social engineering to trick users into clicking malicious links, but once executed, the scripts can perform actions such as stealing cookies, session tokens, or redirecting users to malicious sites.
The operational impact of this vulnerability extends beyond simple script execution, potentially allowing attackers to perform unauthorized actions on behalf of users. When exploited, the reflected XSS attack can lead to session hijacking, where attackers steal user authentication tokens and gain unauthorized access to WordPress admin panels. The vulnerability also enables more sophisticated attacks such as credential theft, data exfiltration, or the modification of web page content to deceive users. Given that the Library Bookshelves plugin is designed for WordPress environments, attackers could leverage this vulnerability to compromise entire websites, especially those with multiple users or administrative privileges. The lack of authentication requirements for exploiting this vulnerability makes it particularly dangerous as any user visiting a maliciously crafted URL could become a victim without requiring any special credentials or access rights.
Security mitigations for CVE-2024-11359 primarily involve immediate plugin updates to versions that address the reflected XSS vulnerability through proper escaping of URL parameters. WordPress administrators should prioritize updating to the latest available version of the Library Bookshelves plugin, which should include fixes for the add_query_arg function usage. Additionally, implementing proper input validation and output escaping measures can provide defense-in-depth protection against similar vulnerabilities. Organizations should also consider implementing Content Security Policy headers to limit the execution of unauthorized scripts, which can mitigate the impact even if the underlying vulnerability remains unpatched. Network-based protections such as web application firewalls can help detect and block malicious requests attempting to exploit this vulnerability, though they should not be considered a substitute for proper patching. The ATT&CK framework categorizes this vulnerability under T1566, which involves social engineering techniques to manipulate users into executing malicious code, emphasizing the importance of user education alongside technical mitigations. Regular security audits and vulnerability assessments should include checks for outdated plugins, as this vulnerability demonstrates how seemingly minor coding issues can result in significant security risks for WordPress installations.