Denial of Service Vulnerability in Ruby Rack Package - CVE-2024-39316
Summary
UBUNTU-CVE-2024-39316: Rack is a modular Ruby web server interface. Affects ruby-rack versions 1.5.2-1 – 1.5.2-3+deb8u3ubuntu1~esm7. No fix is published. How to fix ↓
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Background
Ruby Rack is a modular web server interface for Ruby applications, enabling seamless communication between web servers and Ruby frameworks. It is widely used for building web applications due to its flexibility and ease of integration. However, a vulnerability has been identified in versions 3.1.0 to 3.1.4, which can lead to Denial of Service (DoS) attacks when processing certain HTTP headers.
Vulnerability Detail
The vulnerability, identified as CVE-2024-39316, arises from a Regular Expression Denial of Service (ReDoS) issue in the Rack::Request::Helpers module. This flaw allows attackers to exploit the server by sending specially crafted Accept-Encoding or Accept-Language headers, causing excessive processing time and potentially leading to a complete service outage. The issue was not addressed in the main branch until version 3.1.5, despite being fixed in the earlier 3.0 release series.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, consider implementing rate limiting on your server to mitigate the impact of potential DoS attacks. Additionally, validate and sanitize incoming HTTP headers to prevent malicious payloads from being processed.
Conclusion
The CVE-2024-39316 vulnerability in the Ruby Rack package poses a significant risk of Denial of Service attacks. Users are strongly advised to upgrade to version 3.1.5 or later to mitigate this risk. Implementing additional security measures can further protect your applications from potential exploits.
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FAQ
CVE-2024-39316 is a vulnerability in the Ruby Rack package that allows attackers to exploit the server through specially crafted HTTP headers, leading to Denial of Service.
Versions 3.1.0 to 3.1.4 of Ruby Rack are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If left unaddressed, this vulnerability can lead to service outages, making your application unavailable to users.
Utilize tools like Vulert, which monitors open-source vulnerabilities in your software using a manifest file like package-lock.json.
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