Headline
GHSA-22f2-v57c-j9cx: 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.
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2024-25126
Rack vulnerable to ReDoS in content type parsing (2nd degree polynomial)
Low severity GitHub Reviewed Published Feb 28, 2024 in rack/rack • Updated Feb 28, 2024
Vulnerability details Dependabot alerts 0
Package
bundler rack (RubyGems)
Affected versions
>= 3.0.0, < 3.0.9.1
>= 0.4, < 2.2.8.1
Patched versions
3.0.9.1
2.2.8.1
Description
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.
References
- GHSA-22f2-v57c-j9cx
- rack/rack@6efb2ce
- rack/rack@d9c163a
- 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
tenderlove published to rack/rack
Feb 28, 2024
Published to the GitHub Advisory Database
Feb 28, 2024
Reviewed
Feb 28, 2024
Last updated
Feb 28, 2024
Severity
Low
Weaknesses
No CWEs
CVE ID
CVE-2024-25126
GHSA ID
GHSA-22f2-v57c-j9cx
Source code
rack/rack
Credits
- byroot Reporter
Checking history
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