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Security Advisories: GSA_kwCzR0hTQS0yMmYyLXY1N2MtajljeM4AA5mE

Rack vulnerable to ReDoS in content type parsing (2nd degree polynomial)

Summary

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:

request["Content-Type"] = (" " * 50_000) + "a,"

Impact

It's a very easy to craft ReDoS. Like all ReDoS the impact is debatable.

Permalink: https://github.com/advisories/GHSA-22f2-v57c-j9cx
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0yMmYyLXY1N2MtajljeM4AA5mE
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: about 2 months ago
Updated: about 2 months ago


Identifiers: GHSA-22f2-v57c-j9cx, CVE-2024-25126
References: Repository: https://github.com/rack/rack
Blast Radius: 0.0

Affected Packages

rubygems:rack
Dependent packages: 3,603
Dependent repositories: 1,043,594
Downloads: 875,708,068 total
Affected Version Ranges: >= 0.4, < 2.2.8.1, >= 3.0.0, < 3.0.9.1
Fixed in: 2.2.8.1, 3.0.9.1
All affected versions: 0.4.0, 0.9.0, 0.9.1, 1.0.0, 1.0.1, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 1.1.6, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 1.2.7, 1.2.8, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.3.8, 1.3.9, 1.3.10, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.4.6, 1.4.7, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.8, 1.6.9, 1.6.10, 1.6.11, 1.6.12, 1.6.13, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.2.7, 2.2.8, 2.2.9, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.0.10
All unaffected versions: 0.1.0, 0.2.0, 0.3.0