CVE-2024-25126: Rack ReDos in content type parsing (2nd degree polynomial)
First published: Fri Feb 23 2024(Updated: )
### 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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| rubygems/rack | >=0.4<2.2.8.1 | 2.2.8.1 |
| rubygems/rack | >=3.0.0<3.0.9.1 | 3.0.9.1 |
| redhat/rubygem-rack | <3.0.9.1 | 3.0.9.1 |
| redhat/rubygem-rack | <2.2.8.1 | 2.2.8.1 |
| debian/ruby-rack | 2.1.4-3+deb11u2 2.2.6.4-1+deb12u1 2.2.7-1.1 |
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Reference Links
- https://github.com/rack/rack/security/advisories/GHSA-22f2-v57c-j9cx
- https://github.com/rack/rack/commit/6efb2ceea003c4b195815a614e00438cbd543462
- https://github.com/rack/rack/commit/d9c163a443b8cadf4711d84bd2c58cb9ef89cf49
- https://discuss.rubyonrails.org/t/denial-of-service-vulnerability-in-rack-content-type-parsing/84941
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-25126.yml
- https://nvd.nist.gov/vuln/detail/CVE-2024-25126
- https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html
- https://github.com/advisories/GHSA-22f2-v57c-j9cx (Advisory)
- https://security.netapp.com/advisory/ntap-20240510-0005
- https://security.netapp.com/advisory/ntap-20240510-0005/
- https://launchpad.net/bugs/cve/CVE-2024-25126
- https://github.com/rack/rack/releases/tag/v2.2.8.1
- https://security-tracker.debian.org/tracker/CVE-2024-25126
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-25126
- https://ubuntu.com/security/CVE-2024-25126
- https://access.redhat.com/security/cve/CVE-2024-25126
- https://access.redhat.com/security/cve/CVE-2024-26141
- https://access.redhat.com/security/cve/CVE-2024-26146
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2265599
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2265596
- https://access.redhat.com/errata/RHSA-2024:1841
- https://access.redhat.com/errata/RHSA-2024:1846
- https://access.redhat.com/errata/RHSA-2024:2007
- https://access.redhat.com/errata/RHSA-2024:2113
- https://access.redhat.com/errata/RHSA-2024:2581
- https://access.redhat.com/errata/RHSA-2024:2584
- https://access.redhat.com/errata/RHSA-2024:2953
- https://access.redhat.com/errata/RHSA-2024:3431
- https://access.redhat.com/errata/RHSA-2024:10806
- https://bugzilla.redhat.com/show_bug.cgi?id=2265593
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