CVE-2011-3127 in WordPress
Summary
by MITRE
WordPress 3.1 before 3.1.3 and 3.2 before Beta 2 does not prevent rendering for (1) admin or (2) login pages inside a frame in a third-party HTML document, which makes it easier for remote attackers to conduct clickjacking attacks via a crafted web site.
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Analysis
by VulDB Data Team • 11/17/2021
WordPress versions 3.1 before 3.1.3 and 3.2 before Beta 2 contain a critical security flaw that undermines the protection mechanisms designed to prevent clickjacking attacks. This vulnerability stems from the absence of proper frame-busting techniques or security headers that would prevent the administration and login pages from being embedded within iframes on third-party websites. The flaw allows malicious actors to create deceptive web pages that display WordPress admin or login interfaces within hidden frames, creating an environment where users may unknowingly interact with these disguised interfaces. This vulnerability directly maps to CWE-1021, which describes insufficient protection against clickjacking attacks, and represents a significant weakening of the application's security posture. The issue enables attackers to craft malicious websites that overlay transparent or semi-transparent frames containing WordPress login or admin interfaces, making it appear as though users are interacting with legitimate WordPress pages while actually performing actions on attacker-controlled interfaces. This vulnerability is particularly dangerous because it targets the most privileged areas of the WordPress system, providing attackers with potential access to administrative functions and user accounts.
The technical implementation of this vulnerability occurs through the lack of X-Frame-Options headers or frame-busting JavaScript code within WordPress's administrative and authentication pages. When WordPress renders these sensitive pages, it fails to include security measures that would prevent the page from being embedded in frames from different origins. This allows attackers to create a layered attack surface where they can overlay their own content on top of the WordPress interface, making it appear as though users are performing legitimate administrative actions while actually executing malicious commands. The vulnerability is classified under the ATT&CK technique T1190, which describes the use of web shells or malicious web content to maintain access to systems. The flaw creates a dangerous environment where social engineering becomes significantly more effective, as users may be deceived into performing actions on what appears to be a legitimate WordPress interface but is actually a malicious frame overlay.
The operational impact of this vulnerability extends beyond simple clickjacking scenarios and represents a serious threat to WordPress administrators and users. Attackers can exploit this vulnerability to harvest credentials, perform unauthorized administrative actions, or manipulate user data through seemingly legitimate interface interactions. The vulnerability is particularly concerning because it affects the core authentication and administrative interfaces of WordPress, which are critical to system security. Users who are authenticated to WordPress may unknowingly perform actions on maliciously constructed pages, potentially leading to complete system compromise. This vulnerability can be exploited in conjunction with other attack vectors, such as cross-site scripting or credential theft, creating a multi-layered threat that can result in unauthorized access to sensitive systems. The exploitation requires minimal technical skill, making it a popular target for attackers who may not possess advanced technical capabilities.
Mitigation strategies for this vulnerability involve implementing proper security headers and frame-busting mechanisms within WordPress installations. The most effective approach is to ensure that WordPress includes X-Frame-Options headers with values such as "DENY" or "SAMEORIGIN" to prevent the rendering of pages within external frames. Additionally, implementing Content Security Policy headers with frame-ancestors directives provides more robust protection against framing attacks. WordPress administrators should ensure they are running patched versions of the software, specifically versions 3.1.3 or later for the 3.1.x series and Beta 2 or later for the 3.2.x series. Organizations should also implement monitoring for suspicious frame embedding attempts and consider additional security measures such as two-factor authentication to provide defense-in-depth. The vulnerability highlights the importance of implementing proper security headers at the application level and demonstrates the critical need for regular security updates to address known vulnerabilities in content management systems.