Denial of Service Vulnerability in Puma Package - USN-6597-1
Summary
USN-6597-1: puma vulnerability. Affects puma versions < 5.6.5-4ubuntu2.1. Fixed in 5.6.5-4ubuntu2.1. How to fix ↓
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Background
Puma is a high-performance web server for Ruby/Rack applications, designed to handle concurrent requests efficiently. It is widely used in web applications due to its speed and ability to serve multiple requests simultaneously. However, a recent vulnerability has been identified that affects its ability to handle chunked transfer encoding, potentially leading to resource exhaustion.
Vulnerability Detail
The vulnerability arises from Puma's improper handling of chunked transfer encoding bodies. This flaw allows a remote attacker to exploit the server, causing it to consume excessive resources. As a result, the server may become unresponsive, leading to a denial of service. The issue has been tracked under CVE-2024-21647, highlighting its significance in the context of web application security.
How To Fix
Minimum fixed version
5.6.5-4ubuntu2.1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade pumaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can limit the number of concurrent requests to Puma or implement rate limiting at the application level to mitigate the impact of this vulnerability until the package is updated.
Conclusion
In summary, the Puma package has a critical vulnerability that can lead to denial of service due to improper handling of chunked transfer encoding. It is crucial for users to update to the latest patched version to protect their applications. Additionally, temporary workarounds can help mitigate the risk until the update is applied.
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FAQ
The vulnerability is related to improper handling of chunked transfer encoding, which can lead to denial of service due to resource exhaustion.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If exploited, this vulnerability can cause the Puma server to become unresponsive, affecting the availability of web applications relying on it.
Yes, the patched version of Puma is 5.6.5-4ubuntu2.1, which addresses this vulnerability.
If an immediate update is not possible, consider implementing rate limiting or reducing the number of concurrent requests to mitigate the risk.
References
Related vulnerabilities
Recent vulnerabilities recorded for puma.
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