# Active Storage allowed transformation methods potentially unsafe Active Storage attempts to prevent the use of potentially unsafe image
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 7.1.5.2, 7.0.2.1, 8.0.2.1, 7.2.2.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- 1 Metasploit module, 1 proof of concept on GitHub
- Exploitation: poc
- Automatable: yes
- Technical impact: total
Summary
Active Storage allowed transformation methods potentially unsafe Active Storage attempts to prevent the use of potentially unsafe image transformation methods and parameters by default. The default allowed list contains three methods allow for the circumvention of the safe defaults which enables potential command injection vulnerabilities in cases where arbitrary user supplied input is accepted as valid transformation methods or parameters. Impact ------ This vulnerability impacts applications that use Active Storage with the image_processing processing gem in addition to mini_magick as the image processor. Vulnerable code will look something similar to this: ``` <%= image_tag blob.variant(params[:t] => params[:v]) %> ``` Where the transformation method or its arguments are untrusted arbitrary input. All users running an affected release should either upgrade or use one of the workarounds immediately. Workarounds ----------- Consuming user supplied input for image transformation methods or their parameters is unsupported behavior and should be considered dangerous. Strict validation of user supplied methods and parameters should be performed as well as having a strong ImageMagick security policy deployed. Credits ------- Thank you lio346 for reporting this!
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: poc · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Rails activestorage
From 5.2; From 7.0 · fixed in 7.1.5.2; From 8.0 · fixed in 7.0.2.1
- activestorageRubyGems
From 8.0 · fixed in 8.0.2.1
- activestorageRubyGems
From 7.2 · fixed in 7.2.2.2
- activestorageRubyGems
From 5.2.0 · fixed in 7.1.5.2