CVE-2023-29236 in Outdoor Theme
Summary
by MITRE • 04/07/2023
Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Cththemes Outdoor theme <= 3.9.6 versions.
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Analysis
by VulDB Data Team • 04/07/2023
The CVE-2023-29236 vulnerability represents a critical unauthenticated reflected cross-site scripting flaw discovered in the Cththemes Outdoor WordPress theme affecting versions 3.9.6 and earlier. This vulnerability resides within the theme's handling of user input parameters that are reflected back to users without proper sanitization or encoding mechanisms. The flaw specifically manifests when the theme processes certain GET parameters in its frontend rendering logic, creating an attack vector that allows malicious actors to inject arbitrary JavaScript code into web pages viewed by unsuspecting users.
The technical exploitation of this vulnerability occurs through the manipulation of URL parameters that are directly incorporated into HTML output without adequate validation or output encoding. When a user visits a maliciously crafted URL containing crafted script payloads, the theme's code fails to properly sanitize these inputs before rendering them in the browser context. This reflective nature means that the malicious script code is executed in the victim's browser session, making it particularly dangerous as it can leverage the user's authenticated session cookies or perform actions on their behalf. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting weaknesses in web applications, and it maps to ATT&CK technique T1531 which covers the use of malicious scripts in web applications for privilege escalation and data exfiltration.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the capability to perform session hijacking, steal sensitive user information, redirect users to malicious domains, or even install malware through browser-based attacks. An attacker could craft a phishing campaign using this vulnerability to target users of websites running the affected theme, potentially compromising user accounts and gaining unauthorized access to sensitive data. The unauthenticated nature of the vulnerability means that attackers do not require any credentials to exploit the flaw, making it particularly dangerous for widespread exploitation. The affected theme's user base could include various types of websites such as outdoor recreation sites, travel blogs, or business directories that rely on the Cththemes Outdoor theme, creating a broad attack surface for potential compromise.
Organizations affected by this vulnerability should immediately implement mitigations including updating to the latest version of the Cththemes Outdoor theme where the XSS flaw has been patched. The patch typically involves implementing proper input validation and output encoding mechanisms to prevent malicious script payloads from being executed in the browser context. Security teams should also consider implementing content security policies that restrict script execution and monitor for suspicious URL patterns in their web application firewalls. Additionally, regular security audits of third-party themes and plugins should be conducted to identify similar vulnerabilities that may exist in other components of the web application stack. The vulnerability demonstrates the importance of proper input sanitization and output encoding practices in web development, particularly in themes and plugins that handle user-provided data in their rendering logic, and highlights the need for continuous security testing of web applications to identify and remediate such critical flaws before they can be exploited by malicious actors.