Code Injection vulnerability in CarrierWave::RMagick

2021-02-08T19:16:39
ID GHSA-CF3W-G86H-35X4
Type github
Reporter GitHub Advisory Database
Modified 2021-02-09T18:49:29

Description

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

```ruby 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 mit.shibuya@gmail.com