Executive Summary

CVE-2023-53884 is a stored cross-site scripting (XSS) vulnerability in Webedition CMS version 2.9.8.8. Authenticated users can upload malicious SVG files containing embedded JavaScript through the media upload feature. When other users view these SVG files, the embedded scripts execute, allowing attackers to run arbitrary scripts within the context of the CMS. This occurs due to improper neutralization of input during web page generation. [1, 2]

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Impact Analysis

This vulnerability can allow attackers to execute arbitrary JavaScript code in the browsers of users who view the malicious SVG files. Potential impacts include session hijacking, defacement of the website, and other client-side attacks within the Webedition CMS environment. Because the malicious code is stored and executed persistently, it can affect multiple users and compromise the security and integrity of the CMS. [1, 2]

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Detection Guidance

This vulnerability can be detected by checking for the presence of malicious SVG files uploaded through the media upload feature of Webedition CMS v2.9.8.8. Specifically, look for SVG files containing embedded JavaScript code, such as <script> tags within SVG files. You can search the upload directories for SVG files and inspect their contents for suspicious scripts. For example, on the server hosting the CMS, you can run commands like: 1) Find all SVG files: `find /path/to/webedition/uploads -name '*.svg'` 2) Search for script tags inside SVG files: `grep -r '<script' /path/to/webedition/uploads/*.svg` or `grep -r '<script' /path/to/webedition/uploads/` This will help identify SVG files that contain embedded JavaScript, indicating potential exploitation of the vulnerability. [2]

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Mitigation Strategies

Immediate mitigation steps include restricting or disabling the upload of SVG files through the media upload feature in Webedition CMS v2.9.8.8, especially from authenticated users who do not require this functionality. Additionally, implement server-side validation and sanitization to prevent SVG files containing embedded JavaScript from being uploaded or served. If possible, update or patch the CMS to a version that addresses this vulnerability once available. As a temporary measure, review and remove any suspicious SVG files containing scripts from the media library to prevent execution of malicious code. [1, 2]

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