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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWNmM3ctZzg2aC0zNXg0

Code Injection vulnerability in CarrierWave::RMagick

Impact

CarrierWave::RMagick has a Code Injection vulnerability. Its #manipulate! method inappropriately evals the content of mutation option(:read/:write), allowing attackers to craft a string that can be executed as a Ruby code.
If an application developer supplies untrusted inputs to the option, it will lead to remote code execution(RCE).

(But supplying untrusted input to the option itself is dangerous even in absence of this vulnerability, since is prone to DoS vulnerability - attackers can try to consume massive amounts of memory by resizing to a very large dimension)

Proof of Concept

class MyUploader < CarrierWave::Uploader::Base
  include CarrierWave::RMagick
end

MyUploader.new.manipulate!({ read: { density: "1 }; p 'Hacked'; {" }}) # => shows "Hacked"

Patches

Upgrade to 2.1.1 or 1.3.2.

Workarounds

Stop supplying untrusted input to #manipulate!'s mutation option.

References

Code Injection Software Attack

For more information

If you have any questions or comments about this advisory:

• Open an issue in CarrierWave repo
• Email me at [email protected]

Permalink: https://github.com/advisories/GHSA-cf3w-g86h-35x4
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWNmM3ctZzg2aC0zNXg0
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 3 years ago
Updated: 12 months ago

CVSS Score: 7.4
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

Identifiers: GHSA-cf3w-g86h-35x4, CVE-2021-21305
References:

• https://github.com/carrierwaveuploader/carrierwave/security/advisories/GHSA-cf3w-g86h-35x4
• https://github.com/carrierwaveuploader/carrierwave/commit/387116f5c72efa42bc3938d946b4c8d2f22181b7
• https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#132---2021-02-08
• https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#211---2021-02-08
• https://rubygems.org/gems/carrierwave
• https://nvd.nist.gov/vuln/detail/CVE-2021-21305
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/carrierwave/CVE-2021-21305.yml
• https://github.com/advisories/GHSA-cf3w-g86h-35x4

Repository: https://github.com/carrierwaveuploader/carrierwave
Blast Radius: 35.7

Affected Packages