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Security Advisories: GSA_kwCzR0hTQS03NWoyLTlnbWMtbTg1Nc4AA_yE

Camaleon CMS vulnerable to stored XSS through user file upload (GHSL-2024-184)

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 or a string of an unsupported format. 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.)

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) can be created that disallows inlined script. (Other parts of the application might need modification to continue functioning.)

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.

Permalink: https://github.com/advisories/GHSA-75j2-9gmc-m855
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS03NWoyLTlnbWMtbTg1Nc4AA_yE
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 2 months ago
Updated: about 2 months ago


CVSS Score: 5.4
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-75j2-9gmc-m855
References: Repository: https://github.com/owen2345/camaleon-cms
Blast Radius: 6.9

Affected Packages

rubygems:camaleon_cms
Dependent packages: 7
Dependent repositories: 19
Downloads: 339,976 total
Affected Version Ranges: >= 2.8.0, < 2.8.2
Fixed in: 2.8.2
All affected versions: 2.8.0, 2.8.1
All unaffected versions: 0.0.1, 0.0.2, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.1.7, 0.1.8, 0.1.9, 0.2.0, 0.2.1, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.1.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.1.0, 2.1.1, 2.2.0, 2.2.1, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.7.5, 2.8.2, 2.8.3