CVE-2023-37269
Winter CMS stored XSS through privileged upload of SVG file
描述
### Impact Users with the `backend.manage_branding` permission can upload SVGs as the application logo. Previously, SVG uploads were not sanitized, which could have allowed a stored XSS attack. Although this was a security issue, it's important to note that its severity is low. To exploit the vulnerability, an attacker would already need to have developer or super user level permissions in Winter CMS. This means they would already have extensive access and control within the system. Additionally, to execute the XSS, the attacker would need to convince the victim to directly visit the URL of the maliciously uploaded SVG, and the application would have to be using local storage where uploaded files are served under the same domain as the application itself instead of a CDN. This is because all SVGs in Winter CMS are rendered through an `img` tag, which prevents any payloads from being executed directly. These two factors significantly limit the potential harm of this vulnerability. That being said, all users are advised to update to the latest version (1.2.3) to ensure their systems remain secure. ### Patches This issue has been patched in v1.2.3 through the inclusion of full support for SVG uploads and automatic sanitization of uploaded SVG files. ### Workarounds Apply https://github.com/wintercms/storm/commit/186d85d8fea2cae43afc807d39f68553c24e56be & https://github.com/wintercms/winter/commit/fa50b4c7489b67ea80072f8ac9fe5294fce1df1c manually if unable to upgrade to v1.2.3.
如何修補 CVE-2023-37269
要修補 CVE-2023-37269,請將受影響套件升級到下列已修補版本。
- —升級至 1.2.3 或更新版本
CVE-2023-37269 正在被利用嗎?
低 — EPSS 為 1.6%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- from 0, < 1.2.3