CVE-2017-18599 in Pinfinity Theme
Summary
by MITRE
The Pinfinity theme before 2.0 for WordPress has XSS via the s parameter.
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Analysis
by VulDB Data Team • 12/19/2023
The vulnerability identified as CVE-2017-18599 affects the Pinfinity theme for WordPress versions prior to 2.0, presenting a cross-site scripting flaw that could be exploited by malicious actors to execute arbitrary code in the context of a victim's browser. This vulnerability specifically manifests through the s parameter, which is commonly used for search functionality within WordPress themes and plugins. The issue represents a critical security concern as it allows attackers to inject malicious scripts that can compromise user sessions, steal sensitive information, or redirect users to malicious websites.
The technical flaw stems from insufficient input validation and output escaping within the theme's search handling mechanism. When users submit search queries through the s parameter, the theme fails to properly sanitize or escape the input before rendering it in the web page context. This lack of proper sanitization creates an environment where attacker-controlled data can be interpreted as executable code by web browsers, particularly when the parameter value contains script tags or other malicious payloads. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates how inadequate parameter handling can create persistent security weaknesses in content management systems.
The operational impact of this vulnerability extends beyond simple script injection, as it can be leveraged for more sophisticated attacks within the WordPress ecosystem. An attacker could craft malicious search queries that, when processed by the vulnerable theme, would execute scripts in the context of authenticated users' browsers. This could lead to session hijacking, unauthorized administrative actions, or the deployment of additional malware through browser-based attacks. The vulnerability is particularly concerning because it affects a widely used theme, potentially exposing numerous WordPress installations to exploitation. Attackers could utilize this flaw as part of broader campaign strategies targeting WordPress sites, as documented in various threat actor methodologies that align with ATT&CK technique T1566 for credential harvesting through social engineering and web application attacks.
Mitigation strategies for CVE-2017-18599 should prioritize immediate theme updates to version 2.0 or later, which contains the necessary patches to address the XSS vulnerability. Administrators should also implement additional defensive measures including input validation at multiple layers, proper output encoding for all dynamic content, and regular security auditing of installed themes and plugins. Network-level protections such as web application firewalls can provide additional defense in depth, though they should not replace proper code-level fixes. Security monitoring should include detection of suspicious search parameters and anomalous user behavior patterns that might indicate exploitation attempts. Organizations should also consider implementing content security policies to limit the execution of unauthorized scripts, and conduct regular vulnerability assessments to identify similar issues in other components of their WordPress installations. The remediation process must ensure that all instances of the vulnerable theme are updated across the entire WordPress environment, including any multisite configurations or network installations that might be affected by this vulnerability.