MISP: Stored XSS via Inline-Served SVG Organisation Logos and Report Pictures
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| MISP | MISP | affected |
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| Misp | Misp |
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Vendor Solution
A new sandboxInlineFile() method is added to RestResponseComponent. When a file is served inline (download=false) and its type is SVG (svg, svgz, or image/svg+xml), the response is augmented with a Content-Security-Policy header containing the sandbox directive (which assigns an opaque origin and disables script execution, plugins, and form submission) along with restrictive default-src, style-src, img-src, and font-src directives that still permit rendering of inline styles, embedded raster images, and data: fonts. An X-Content-Type-Options: nosniff header is also set. The method is invoked from both the generic sendFile() path and the org-logo endpoint. The enable_svg_logos setting description is updated to warn administrators that SVG files remain XML documents and should be left disabled unless required.
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.396% probability within 30 days)
| Link | Providers |
|---|---|
| https://github.com/MISP/MISP/commit/86496aecc |
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| Type | Values Removed | Values Added |
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| First Time appeared |
Misp
Misp misp |
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| Vendors & Products |
Misp
Misp misp |
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| Description | Affected versions of MISP serve uploaded SVG images inline without a restrictive browser sandbox. The commit explains that SVG files are XML documents rather than passive bitmap images. While scripts inside SVG do not execute when the SVG is rendered through a normal <img>, they can execute when the SVG is navigated to directly or embedded as a document. In that case, malicious <script> elements, event handlers, or javascript: URLs execute on the MISP origin with the viewer’s session. The affected use cases include: - organisation SVG logos; - event-report SVG pictures. Importantly, the vulnerable behavior is on the serve path, not merely the upload path: the patch notes that a malicious SVG uploaded while SVG support was enabled could remain dangerous even after uploads were later disabled. Version affected: ≤2.5.45 | |
| Title | MISP: Stored XSS via Inline-Served SVG Organisation Logos and Report Pictures | |
| Weaknesses | CWE-693 CWE-79 |
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| References |
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| Metrics |
cvssV4_0
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