Critical Vulnerabilities in Apache2 Package: HTTP Request Splitting and Denial of Service Risks
Summary
USN-6729-3: apache2 vulnerabilities. Affects apache2 versions < 2.4.58-1ubuntu8.1. Fixed in 2.4.58-1ubuntu8.1. How to fix ↓
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Background
Apache2 is a widely used open-source web server software that enables the hosting of websites and applications. It is known for its flexibility, performance, and robust feature set, including support for various protocols and modules. However, recent vulnerabilities have been identified that could potentially compromise the security and stability of systems running Apache2, particularly in the Ubuntu 24.04 LTS environment.
Vulnerability Detail
The vulnerabilities in Apache2 stem from improper input validation, which can lead to HTTP request splitting attacks. This allows remote attackers to manipulate requests, potentially leading to unauthorized actions or data exposure. Additionally, the HTTP/2 module has a flaw that can cause resource exhaustion, resulting in a denial of service. The vulnerabilities are identified as CVE-2023-38709, CVE-2024-24795, and CVE-2024-27316, highlighting the critical nature of these issues.
How To Fix
Minimum fixed version
2.4.58-1ubuntu8.1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade apache2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, you can restrict access to the Apache server or disable the HTTP/2 module until the update is applied. This can be done by modifying the Apache configuration file and commenting out the line that enables HTTP/2 support.
Conclusion
The identified vulnerabilities in the Apache2 package pose significant risks to systems running Ubuntu 24.04 LTS. It is crucial to apply the necessary updates to safeguard against potential attacks. Utilizing tools like Vulert can further enhance your security posture by providing real-time monitoring of vulnerabilities.
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FAQ
The vulnerabilities include improper input validation leading to HTTP request splitting and resource exhaustion in the HTTP/2 module, identified as CVE-2023-38709, CVE-2024-24795, and CVE-2024-27316.
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.
Immediately update your Apache2 package to the latest patched version using the command 'sudo apt update && sudo apt upgrade apache2' to mitigate the vulnerabilities.
While specific exploits may not be publicly disclosed, the nature of the vulnerabilities suggests that they could be leveraged for unauthorized access and denial of service attacks.
Vulert is a tool that allows you to monitor and alert for open-source vulnerabilities in your software using just a manifest file. You can check your application for vulnerabilities in real-time without any signup.
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