Denial of Service Vulnerability in Ruby Rack Package
Summary
UBUNTU-CVE-2024-26146: Rack is a modular Ruby web server interface. Affects ruby-rack versions < 1.5.2-3+deb8u3ubuntu1~esm8. Fixed in 1.5.2-3+deb8u3ubuntu1~esm8. How to fix ↓
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Background
Ruby Rack is a modular web server interface for Ruby applications, allowing developers to build web applications in a flexible and efficient manner. It serves as a bridge between web servers and Ruby frameworks, enabling seamless communication. The package is widely used in the Ruby ecosystem, making it essential for many web applications. However, it has been identified to have a vulnerability that can lead to denial of service under specific conditions.
Vulnerability Detail
The vulnerability arises from the way Rack handles certain HTTP headers, specifically the Accept and Forwarded headers. Maliciously crafted headers can cause the header parsing process to take longer than expected, potentially leading to a denial of service. This issue affects versions of Rack prior to the patched versions, which include 2.0.9.4, 2.1.4.4, 2.2.8.1, and 3.0.9.1. It is important to note that applications using Ruby 3.2 or newer are not affected by this vulnerability due to built-in mitigations.
How To Fix
Minimum fixed version
1.5.2-3+deb8u3ubuntu1~esm8
This is the first release that contains the fix.
sudo apt-get install --only-upgrade ruby-rackTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, if upgrading is not immediately possible, consider implementing rate limiting on your application to mitigate the impact of potential denial of service attacks. This can be done by configuring your web server or application framework to limit the number of requests from a single IP address within a specified timeframe.
Conclusion
The Ruby Rack package has a vulnerability that can lead to denial of service due to improper handling of HTTP headers. It is crucial to update to the patched versions to ensure the security of your applications. Additionally, implementing rate limiting can serve as a temporary workaround until the update can be applied.
See every vulnerability recorded for ruby-rack →
FAQ
The CVSS score of this vulnerability is 5.3, indicating a medium severity level.
Versions of Ruby Rack prior to 2.0.9.4, 2.1.4.4, 2.2.8.1, and 3.0.9.1 are affected by this vulnerability.
You can use Vulert, which allows you to monitor and alert for open-source vulnerabilities in your software using just a manifest file. You can check your application for this vulnerability using the Vulert playground at Vulert Scanner.
Yes, implementing rate limiting on your application can help mitigate the impact of potential denial of service attacks.
If immediate upgrading is not possible, ensure that your application is monitored closely for unusual traffic patterns and consider applying rate limiting as a temporary measure.
Related vulnerabilities
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