Updated advisory posts against rubysec/ruby-advisory-db@aa479b5

Author: jasnow

advisories/_posts/2024-09-23-GHSA-8fx8-3rg2-79xw.md

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+---
+layout: advisory
+title: 'GHSA-8fx8-3rg2-79xw (camaleon_cms): Camaleon CMS vulnerable to stored XSS
+  through user file upload (GHSL-2024-184)'
+comments: false
+categories:
+- camaleon_cms
+advisory:
+  gem: camaleon_cms
+  ghsa: 8fx8-3rg2-79xw
+  url: https://github.com/owen2345/camaleon-cms/security/advisories/GHSA-r9cr-qmfw-pmrc
+  title: Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)
+  date: 2024-09-23
+  description: |
+    A stored cross-site scripting has been found in the image upload
+    functionality that can be used by normal registered users:
+    It is possible to upload a SVG image containing JavaScript and
+    it's also possible to upload a HTML document when the format
+    parameter is manually changed to [documents][1] or a string of
+    an [unsupported format][2]. If an authenticated user or administrator
+    visits that uploaded image or document malicious JavaScript can
+    be executed on their behalf (e.g. changing or deleting content
+    inside of the CMS.)
+
+    [1]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L105-L106
+    [2]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L110-L111
+
+    ## Impact
+
+    This issue may lead to account takeover due to reflected
+    Cross-site scripting (XSS).
+
+    ## Remediation
+
+    Only allow the upload of safe files such as PNG, TXT and others
+    or serve all "unsafe" files such as SVG and other files with a
+    content-disposition: attachment header, which should prevent
+    browsers from displaying them.
+
+    Additionally, a [Content security policy (CSP)][3] can be created
+    that disallows inlined script. (Other parts of the application
+    might need modification to continue functioning.)
+
+    [3]: https://web.dev/articles/csp
+
+    To prevent the theft of the auth_token it could be marked with
+    HttpOnly. This would however not prevent that actions could be
+    performed as the authenticated user/administrator. Furthermore,
+    it could make sense to use the authentication provided by
+    Ruby on Rails, so that stolen tokens cannot be used anymore
+    after some time.
+  cvss_v3: 5.4
+  patched_versions:
+  - ">= 2.8.1"
+  related:
+    url:
+    - https://github.com/owen2345/camaleon-cms/security/advisories/GHSA-r9cr-qmfw-pmrc
+    - https://github.com/rubysec/ruby-advisory-db/blob/master/gems/camaleon_cms/GHSA-r9cr-qmfw-pmrc.yml
+    - https://github.com/advisories/GHSA-8fx8-3rg2-79xw
+---