Critical Vulnerabilities in ruby-rack: Denial of Service Risks
Summary
USN-6905-1: ruby-rack vulnerabilities. Affects ruby-rack versions < 1.5.2-3+deb8u3ubuntu1~esm7. Fixed in 1.5.2-3+deb8u3ubuntu1~esm7. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
ruby-rack is a widely-used web application framework for Ruby, designed to provide a modular interface for web servers. It facilitates the development of web applications by offering essential components for handling HTTP requests and responses. However, recent vulnerabilities have been identified that could allow attackers to exploit the framework, leading to potential denial of service conditions.
Vulnerability Detail
The vulnerabilities discovered in ruby-rack stem from improper handling of regular expressions and Multipart MIME parsing. Specifically, CVE-2023-27539 allows a remote attacker to craft requests that cause excessive resource consumption, potentially leading to service outages. CVE-2023-27530 affects only Ubuntu 20.04 LTS and Ubuntu 22.04 LTS, where similar resource exhaustion can occur due to flawed MIME parsing. These vulnerabilities highlight the need for immediate attention to ensure the stability and security of applications utilizing ruby-rack.
How To Fix
Minimum fixed version
1.5.2-3+deb8u3ubuntu1~esm7
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
If immediate patching is not possible, consider implementing rate limiting on your web server to mitigate the impact of potential denial of service attacks. This can help control the number of requests a user can make in a given timeframe, reducing the risk of resource exhaustion.
Conclusion
The vulnerabilities in ruby-rack present significant risks, particularly in terms of denial of service attacks. It is essential for users to update to the latest patched versions to ensure the security and stability of their applications. Implementing workarounds such as rate limiting can provide temporary relief while updates are being applied.
See every vulnerability recorded for ruby-rack →
FAQ
The main vulnerabilities are related to improper handling of regular expressions and Multipart MIME parsing, leading to potential denial of service.
The vulnerabilities affect Ubuntu 14.04 LTS, 16.04 LTS, 18.04 LTS, 20.04 LTS, and 22.04 LTS.
You can use Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
Implement rate limiting on your web server to help mitigate the risk of denial of service attacks until you can apply the patch.
Detailed information can be found in the Ubuntu Security Notices, specifically USN-6905-1, which outlines the vulnerabilities and their implications.
References
Related vulnerabilities
Recent vulnerabilities recorded for ruby-rack.
