MEDIUM5.3
GHSA-22f2-v57c-j9cx
Rack vulnerable to ReDoS in content type parsing (2nd degree polynomial)
Quick fix
GHSA-22f2-v57c-j9cx — rack: upgrade to the fixed version with the command below.
bundle update rackDetails
### Summary
```ruby module Rack class MediaType SPLIT_PATTERN = %r{\s*[;,]\s*} ``` The above regexp is subject to ReDos. 50K blank characters as a prefix to the header will take over 10s to split.
### PoC
A simple HTTP request with lots of blank characters in the content-type header:
```ruby request["Content-Type"] = (" " * 50_000) + "a," ```
### Impact
It's a very easy to craft ReDoS. Like all ReDoS the impact is debatable.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/rack/rack/security/advisories/GHSA-22f2-v57c-j9cx[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2024-25126[ADVISORY]
- https://github.com/rack/rack/commit/6efb2ceea003c4b195815a614e00438cbd543462[WEB]
- https://github.com/rack/rack/commit/d9c163a443b8cadf4711d84bd2c58cb9ef89cf49[WEB]
- https://discuss.rubyonrails.org/t/denial-of-service-vulnerability-in-rack-content-type-parsing/84941[WEB]
- https://github.com/rack/rack[PACKAGE]
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-25126.yml[WEB]
- https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html[WEB]
- https://security.netapp.com/advisory/ntap-20240510-0005[WEB]