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| author | David Mehren | 2021-05-09 15:25:59 +0200 |
|---|---|---|
| committer | David Mehren | 2021-05-09 19:21:27 +0200 |
| commit | 4a0216096a6aa1ebba9d8b0ada067c73ffa1513f (patch) | |
| tree | d35701d841db5c7fa49a1c90e9614d5b5a0d768d /lib/web/note | |
| parent | 87c83dcba5ebab9078a7e625023d7fe37889adb8 (diff) | |
Escape custom Open Graph tags
HedgeDoc allows to specify custom Open Graph tags using the
`opengraph` key in the YAML metadata of a note.
These are rendered into the HTML delivered to clients using `ejs` and
its `<%-` tag. This outputs the variable unescaped into the template
and therefore allows to inject arbitrary strings,
including `<script>` tags.
This commit changes the template to use ejs's `<%=` tag instead,
which automatically escapes the variables content,
thereby mitigating the XSS vector.
See also https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq
Co-authored-by: Christoph (Sheogorath) Kern <sheogorath@shivering-isles.com>
Signed-off-by: David Mehren <git@herrmehren.de>
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