Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS12Zm12LWpmYzUtcGpqd84AA6Re

CarrierWave content-Type allowlist bypass vulnerability which possibly leads to XSS remained

Impact

The vulnerability CVE-2023-49090 wasn't fully addressed.

This vulnerability is caused by the fact that when uploading to object storage, including Amazon S3, it is possible to set a Content-Type value that is interpreted by browsers to be different from what's allowed by content_type_allowlist, by providing multiple values separated by commas.

This bypassed value can be used to cause XSS.

Patches

Upgrade to 3.0.7 or 2.2.6.

Workarounds

Use the following monkey patch to let CarrierWave parse the Content-type by using Marcel::MimeType.for.

# For CarrierWave 3.x
CarrierWave::SanitizedFile.class_eval do
  def declared_content_type
    @declared_content_type ||
      if @file.respond_to?(:content_type) && @file.content_type
        Marcel::MimeType.for(declared_type: @file.content_type.to_s.chomp)
      end
  end
end

# For CarrierWave 2.x
CarrierWave::SanitizedFile.class_eval do
  def existing_content_type
    if @file.respond_to?(:content_type) && @file.content_type
      Marcel::MimeType.for(declared_type: @file.content_type.to_s.chomp)
    end
  end
end

References

OWASP - File Upload Cheat Sheet

Permalink: https://github.com/advisories/GHSA-vfmv-jfc5-pjjw
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS12Zm12LWpmYzUtcGpqd84AA6Re
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 10 months ago
Updated: 10 months ago

CVSS Score: 6.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

EPSS Percentage: 0.00043
EPSS Percentile: 0.10511

Identifiers: GHSA-vfmv-jfc5-pjjw, CVE-2024-29034
References:

• https://github.com/carrierwaveuploader/carrierwave/security/advisories/GHSA-vfmv-jfc5-pjjw
• https://nvd.nist.gov/vuln/detail/CVE-2024-29034
• https://github.com/carrierwaveuploader/carrierwave/commit/25b1c800d45ef8e78dc445ebe3bd8a6e3f0a3477
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/carrierwave/CVE-2024-29034.yml
• https://github.com/advisories/GHSA-vfmv-jfc5-pjjw

Repository: https://github.com/carrierwaveuploader/carrierwave
Blast Radius: 32.8

Affected Packages