{"id":"GHSA-75j2-9gmc-m855","summary":"Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)","details":"A stored cross-site scripting has been found in the image upload functionality that can be used by normal registered users:\nIt is possible to upload a SVG image containing JavaScript and it's also possible to upload a HTML document when the format\nparameter 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.)\n\n[1]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L105-L106\n[2]: https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/uploaders/camaleon_cms_uploader.rb#L110-L111\n\n## Impact\n\nThis issue may lead to account takeover due to reflected Cross-site scripting (XSS).\n\n## Remediation\n\nOnly 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.\n\nAdditionally, a [Content security policy (CSP)][3] can be created that disallows inlined script. (Other parts of the application might need modification to continue functioning.)\n\n[3]: https://web.dev/articles/csp\n\nTo 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.\n","modified":"2024-12-05T05:39:56.339159Z","published":"2024-09-25T21:53:27Z","database_specific":{"github_reviewed_at":"2024-09-25T21:53:27Z","nvd_published_at":null,"cwe_ids":["CWE-79"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/owen2345/camaleon-cms/security/advisories/GHSA-r9cr-qmfw-pmrc"},{"type":"PACKAGE","url":"https://github.com/owen2345/camaleon-cms"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/camaleon_cms/GHSA-8fx8-3rg2-79xw.yml"}],"affected":[{"package":{"name":"camaleon_cms","ecosystem":"RubyGems","purl":"pkg:gem/camaleon_cms"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"2.8.2"}]}],"versions":["2.8.0","2.8.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/09/GHSA-75j2-9gmc-m855/GHSA-75j2-9gmc-m855.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}