CVE-2024-52595

HIGH7.7EPSS 0.50%

HTML Cleaner allows crafted scripts in special contexts like svg or math to pass through

發布日:2024/11/19修改日:2025/1/14
也稱為:GHSA-5jfw-gq64-q45fPYSEC-2024-160

描述

### Impact The HTML Parser in lxml does not properly handle context-switching for special HTML tags such as `<svg>`, `<math>` and `<noscript>`. This behavior deviates from how web browsers parse and interpret such tags. Specifically, content in CSS comments is ignored by lxml_html_clean but may be interpreted differently by web browsers, enabling malicious scripts to bypass the cleaning process. This vulnerability could lead to Cross-Site Scripting (XSS) attacks, compromising the security of users relying on lxml_html_clean in default configuration for sanitizing untrusted HTML content. ### Patches Users employing the HTML cleaner in a security-sensitive context should upgrade to lxml 0.4.0, which addresses this issue. ### Workarounds As a temporary mitigation, users can configure lxml_html_clean with the following settings to prevent the exploitation of this vulnerability: * `remove_tags`: Specify tags to remove - their content is moved to their parents' tags. * `kill_tags`: Specify tags to be removed completely. * `allow_tags`: Restrict the set of permissible tags, excluding context-switching tags like `<svg>`, `<math>` and `<noscript>`. ### References * https://github.com/fedora-python/lxml_html_clean/pull/19 * https://github.com/fedora-python/lxml_html_clean/pull/19/commits/c5d816f86eb3707d72a8ecf5f3823e0daa1b3808

受影響套件(3)

CVSS 分數

來源版本嚴重程度向量
osvCVSS 3.1HIGH7.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H

參考連結(7)