Vulnerability · Published Jul 7, 2023 · Assigned by GitHub_M
CVE-2023-37269Winter CMS vulnerable to stored XSS through privileged upload of SVG file
Low 2.0
In plain English
A low-severity cross-site scripting in winter from wintercms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.7% (higher than 86% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Users with the `backend.manage_branding` permission can upload SVGs as the application logo. Prior to version 1.2.3, SVG uploads were not sanitized, which could have allowed a stored cross-site scripting (XSS) attack. 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. 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. As a workaround, one may apply the patches manually.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | wintercms/winter | 1.2.3 | GHSA-wjw2-4j7j-6gc3 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
References
- https://github.com/wintercms/winter/security/advisories/GHSA-wjw2-4j7j-6gc3 x_refsource_CONFIRM
- https://github.com/wintercms/storm/commit/186d85d8fea2cae43afc807d39f68553c24e56be x_refsource_MISC
- https://github.com/wintercms/winter/commit/fa50b4c7489b67ea80072f8ac9fe5294fce1df1c x_refsource_MISC
- https://github.com/wintercms/winter/releases/tag/v1.2.3 x_refsource_MISC
- http://packetstormsecurity.com/files/173520/WinterCMS-1.2.2-Cross-Site-Scripting.html