Critical Vulnerability in Apache2: Arbitrary Code Execution Risk
Summary
ALPINE-CVE-2019-0211: In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) cou... Affects apache2 versions < 2.4.39-r0. Fixed in 2.4.39-r0. How to fix ↓
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Background
Apache HTTP Server, commonly referred to as 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, robust performance, and extensive features, including support for various programming languages and modules. However, certain versions of Apache2 have been found to be vulnerable to a significant security flaw that could allow attackers to execute arbitrary code with elevated privileges, potentially compromising the entire server.
Vulnerability Detail
The vulnerability, identified as CVE-2019-0211, affects Apache HTTP Server versions 2.4.17 to 2.4.38 when using the event, worker, or prefork Multi-Processing Modules (MPMs). The flaw arises from improper handling of the scoreboard, which can be manipulated by code executing in less-privileged child processes or threads. This manipulation could lead to arbitrary code execution with the privileges of the parent process, typically root, posing a severe risk to server integrity. Non-Unix systems are not affected by this vulnerability.
How To Fix
Minimum fixed version
2.4.39-r0
This is the first release that contains the fix.
sudo apk add --upgrade apache2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, consider disabling the affected MPMs (event, worker, or prefork) if they are not essential for your application. This can be done by modifying the Apache configuration files to use a different MPM or by restricting access to sensitive scripts.
Conclusion
The CVE-2019-0211 vulnerability in Apache HTTP Server poses a significant risk of arbitrary code execution, particularly for versions 2.4.17 to 2.4.38. It is crucial to update to the patched version 2.4.39-r0 or later to mitigate this risk. Users should also consider temporary workarounds while planning for a full update.
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FAQ
CVE-2019-0211 is a security vulnerability in Apache HTTP Server that allows arbitrary code execution due to improper handling of the scoreboard.
Apache HTTP Server versions 2.4.17 to 2.4.38 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is impacted by this vulnerability without needing to sign up.
The CVSS score for CVE-2019-0211 is 7.8, indicating a high severity level.
If immediate updates are not feasible, consider disabling the affected MPMs or restricting access to sensitive scripts as a temporary workaround.
References
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