Critical Encoding Vulnerability in Apache2 Package: CVE-2024-38473
Summary
UBUNTU-CVE-2024-38473: Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Affects apache2 versions 2.4.6-2ubuntu2 – 2.4.7-1ubuntu4.9. No fix is published. 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 web applications. It is known for its flexibility, power, and extensive support for various modules and configurations. However, it has recently been identified that versions prior to 2.4.60 are vulnerable to an encoding issue in mod_proxy, which can lead to serious security risks.
Vulnerability Detail
The vulnerability, identified as CVE-2024-38473, arises from an encoding problem in the mod_proxy module of Apache HTTP Server versions 2.4.59 and earlier. This flaw allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication mechanisms through crafted requests. The ramifications of this vulnerability are significant, as it could allow unauthorized access to sensitive data or services, leading to data breaches or service disruptions.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you can implement strict input validation on the backend services to reject improperly encoded URLs. However, this is not a substitute for upgrading the affected software.
Conclusion
The CVE-2024-38473 vulnerability poses a significant risk to Apache2 users, allowing potential unauthorized access through crafted requests. It is essential to upgrade to version 2.4.60 or later to protect against this vulnerability. Users are encouraged to stay informed and utilize tools like Vulert for real-time monitoring of open-source vulnerabilities.
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FAQ
CVE-2024-38473 is a critical vulnerability in the Apache2 web server that allows unauthorized access due to an encoding issue in mod_proxy.
Apache2 versions 2.4.59 and earlier are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score of CVE-2024-38473 is 8.1, indicating a high severity level.
If an immediate upgrade is not possible, implement strict input validation on your backend services to mitigate the risk temporarily.
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