Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1
Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability.
Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/rails/rails/releases/tag/v7.2.3.1
security-advisories@github.com
https://github.com/rails/rails/releases/tag/v8.0.4.1
security-advisories@github.com
https://github.com/rails/rails/releases/tag/v8.1.2.1
security-advisories@github.com
https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
security-advisories@github.com
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-…
security-advisories@github.com