Critical Vulnerabilities in ruby-rack: Denial of Service and Remote Code Execution Risks
Summary
USN-5896-1: ruby-rack vulnerabilities. Affects ruby-rack versions < 1.6.4-4ubuntu0.2+esm2. Fixed in 1.6.4-4ubuntu0.2+esm2. How to fix ↓
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Background
ruby-rack is a widely used web application framework for Ruby, designed to provide a modular interface for web servers and applications. It allows developers to build web applications by providing essential components for handling HTTP requests and responses. However, recent vulnerabilities have been discovered that expose applications using ruby-rack to significant security risks, including denial of service and potential remote code execution.
Vulnerability Detail
The vulnerabilities stem from improper parsing of multipart POST requests and inadequate escaping of untrusted data during logging operations. Specifically, CVE-2022-30122 allows attackers to craft malicious multipart POST requests that can lead to denial of service. Meanwhile, CVE-2022-30123 enables attackers to execute arbitrary code on the machine running the application by exploiting logging operations that fail to escape shell sequences properly. These vulnerabilities can be exploited by both users and automated systems, posing a serious threat to applications utilizing ruby-rack.
How To Fix
Minimum fixed version
1.6.4-4ubuntu0.2+esm2
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, you can implement input validation and sanitization to mitigate the risk of malformed multipart POST requests. Additionally, ensure that logging mechanisms are configured to handle untrusted data safely, reducing the risk of shell injection attacks.
Conclusion
The vulnerabilities in ruby-rack present significant risks to web applications, including potential denial of service and remote code execution. It is crucial for developers and system administrators to update to the patched versions of ruby-rack as soon as possible and to implement recommended workarounds in the interim.
See every vulnerability recorded for ruby-rack →
FAQ
ruby-rack is a framework for building web applications in Ruby, providing a modular interface for handling HTTP requests and responses.
The main vulnerabilities include improper parsing of multipart POST requests leading to denial of service and inadequate escaping of untrusted data during logging, which can allow remote code execution.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected without requiring any signup.
If immediate updates are not possible, implement input validation and sanitization as a temporary workaround to reduce the risk of exploitation.
Detailed information can be found in the Ubuntu Security Notices, specifically USN-5896-1, which outlines the vulnerabilities and their implications.
References
Related vulnerabilities
Recent vulnerabilities recorded for ruby-rack.
