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GHSA-cf3w-g86h-35x4
No affected components available
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
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
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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