CVE-2022-33154 in schema Extension
Summary
by MITRE • 07/13/2022
The schema (aka Embedding schema.org vocabulary) extension before 1.13.1 and 2.x before 2.5.1 for TYPO3 allows XSS.
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Analysis
by VulDB Data Team • 07/23/2022
The vulnerability CVE-2022-33154 affects the schema extension, also known as Embedding schema.org vocabulary, within the TYPO3 content management system. This extension enables websites to implement structured data markup using schema.org vocabulary, which helps search engines better understand website content. The flaw exists in versions prior to 1.13.1 for the 1.x branch and 2.5.1 for the 2.x branch, representing a cross-site scripting vulnerability that could allow attackers to execute malicious scripts in the context of a victim's browser.
The technical implementation of this vulnerability stems from insufficient input validation and output escaping within the schema extension's handling of user-provided data. When administrators or users input content that includes schema.org markup, the extension fails to properly sanitize or escape special characters before rendering them in web pages. This oversight creates an environment where malicious actors can inject JavaScript code through carefully crafted schema markup that gets executed when the page loads. The vulnerability specifically targets the extension's rendering mechanism that processes structured data elements, making it particularly dangerous in environments where users with content editing privileges can submit schema markup.
The operational impact of this vulnerability is significant as it allows attackers to perform various malicious activities including session hijacking, credential theft, defacement of content, and redirection to malicious sites. An attacker who can submit content through the schema extension could potentially execute scripts that steal cookies, redirect users to phishing sites, or even inject additional malicious code into the website. The vulnerability affects not only the immediate execution environment but also the broader security posture of TYPO3 installations, as it provides a potential foothold for more extensive attacks. According to CWE-79, this vulnerability maps to Cross-site Scripting, which is classified as a critical security weakness in web applications.
Mitigation strategies for CVE-2022-33154 primarily involve upgrading the schema extension to versions 1.13.1 or 2.5.1 respectively, which contain proper input validation and output escaping mechanisms. Organizations should also implement additional security measures such as content security policies to limit script execution, regular monitoring of content submissions, and strict access controls for users who can modify schema markup. The ATT&CK framework categorizes this vulnerability under T1566 - Phishing and T1059 - Command and Scripting Interpreter, as it enables attackers to establish persistent access through malicious script injection. Security teams should also consider implementing automated scanning tools that can detect and prevent the injection of suspicious script content, particularly in areas where schema.org markup is utilized. Regular security audits of TYPO3 installations, including third-party extensions, are essential to maintain protection against similar vulnerabilities and ensure compliance with industry security standards such as those outlined in ISO/IEC 27001 and NIST cybersecurity frameworks.