Rack CVE-2022-30122: Denial of Service Vulnerability in Rack Multipart Parsing

Summary

Description There is a possible denial of service vulnerability in the multipart parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-30122.

Versions Affected: >= 1.2 Not affected: < 1.2 Fixed Versions: 2.0.9.1, 2.1.4.1, 2.2.3.1

Impact Carefully crafted multipart POST requests can cause Rack's multipart parser to take much longer than expected, leading to a possible denial of service vulnerability.

Impacted code will use Rack's multipart parser to parse multipart posts. This includes directly using the multipart parser like this:

params = Rack::Multipart.parse_multipart(env)

But it also includes reading POST data from a Rack request object like this:

p request.POST # read POST data p request.params # reads both query params and POST data

All users running an affected release should either upgrade or use one of the workarounds immediately.

Full Security Advisory: https://github.com/advisories/GHSA-hxqx-xwvh-44m2