Critical Vulnerability in Ruby Packages: ruby2.5 and ruby3.0
Summary
USN-5806-2: ruby2.5, ruby3.0 vulnerability. Affects ruby2.5 versions < 2.5.1-1ubuntu1.13. Fixed in 2.5.1-1ubuntu1.13. How to fix ↓
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Background
Ruby is a dynamic, open-source programming language known for its simplicity and productivity. It is widely used for web development, particularly with the Ruby on Rails framework. The affected packages, ruby2.5 and ruby3.0, are versions of the Ruby interpreter that enable developers to run Ruby applications. These versions are susceptible to a vulnerability that could allow attackers to manipulate HTTP responses generated by applications using the cgi gem, potentially compromising user data and application integrity.
Vulnerability Detail
The vulnerability, identified as CVE-2021-33621, arises from Ruby's improper handling of user input in applications that generate HTTP responses using the cgi gem. An attacker could exploit this flaw to modify the responses sent to users, leading to possible data leakage or unauthorized actions being taken on behalf of the user. This vulnerability affects multiple versions of Ruby, specifically ruby2.5 and ruby3.0, and poses a significant risk to applications relying on these versions.
How To Fix
Minimum fixed version
2.5.1-1ubuntu1.13
This is the first release that contains the fix.
sudo apt-get install --only-upgrade ruby2.5Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider implementing input validation and sanitization in your application to mitigate the risk of exploitation. Additionally, review your application's use of the cgi gem and consider alternative methods for generating HTTP responses until the update can be applied.
Conclusion
The vulnerability in ruby2.5 and ruby3.0 poses a significant risk to applications that utilize these versions. It is crucial to update to the patched versions to safeguard against potential exploitation. Additionally, employing best practices in input handling can further enhance application security.
See every vulnerability recorded for ruby2.5 →
FAQ
CVE-2021-33621 is a vulnerability in Ruby that allows attackers to manipulate HTTP responses due to improper handling of user input in the cgi gem.
The affected versions are ruby2.5 and ruby3.0, specifically the versions prior to the patched releases.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file like package-lock.json, you can check for vulnerabilities without needing to install any software.
If exploited, this vulnerability could lead to unauthorized data access, manipulation of user responses, and overall compromise of application security.
Yes, implementing input validation and sanitization can help mitigate the risk until you can apply the necessary updates.
References
Related vulnerabilities
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