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When the attributes are put back together, the value of the title attribute is wrapped around in double quotes (line 3018). However, this only works because the crafted title tag uses single quotes. This attribute is valid HTML and would pass the sanitization step. The flaw occurs in the lines 30 of the above snippet, where the attribute values are concatenated back together without being escaped.Īn attacker can create a comment containing a crafted tag and set for example the title attribute of the anchor to title='XSS " onmouseover=alert(1) id="'. ⋮ if ( current_user_can ( 'unfiltered_html' ) )
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The following code snippet shows how this is handled in the WordPress core: If the nonce is invalid, the comment is still created but is sanitized. When the administrator submits a comment and supplies a valid nonce, the comment is created without any sanitization. WordPress tries to solve this problem by generating an extra nonce for administrators in the comment form. In theory, an attacker could simply abuse the CSRF vulnerability to create a comment containing malicious JavaScript code. This can become a security issue since administrators of a WordPress blog are allowed to use arbitrary HTML tags in comments, even tags. This means an attacker can create comments in the name of administrative users of a WordPress blog via CSRF attacks. This is because some WordPress features such as trackbacks and pingbacks would break if there was any validation. WordPress performs no CSRF validation when a user posts a new comment. Considering that comments are a core feature of blogs and are enabled by default, the vulnerability affected millions of sites.ĬSRF in comment form leads to HTML injection
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WordPress is used by over 33% of all websites on the internet, according to its own download page. The vulnerabilities exist in WordPress versions prior to 5.1.1 and is exploitable with default settings.
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The CSRF exploit abuses multiple logic flaws and sanitization errors that when combined lead to Remote Code Execution and a full site takeover. As soon as the victim administrator visits the malicious website, a cross-site request forgery (CSRF) exploit is run against the target WordPress blog in the background, without the victim noticing.
This blog post reveals another critical exploit chain for WordPress 5.1 that enables an unauthenticated attacker to gain remote code execution on any WordPress installation prior to version 5.1.1.Īn attacker can take over any WordPress site that has comments enabled by tricking an administrator of a target blog to visit a website set up by the attacker. Last month we released an authenticated remote code execution (RCE) vulnerability in WordPress 5.0.
WordPress 5.1 CSRF to Remote Code Execution
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