Critical Security Update for modsecurity-apache: CVE-2025-47947
Summary
DLA-4192-1: modsecurity-apache - security update. Affects modsecurity-apache versions < 2.9.3-3+deb11u3. Fixed in 2.9.3-3+deb11u3. How to fix ↓
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Background
modsecurity-apache is an open-source web application firewall that integrates with the Apache HTTP Server. It provides real-time monitoring and protection against various web threats, including SQL injection and cross-site scripting. The package is widely used to enhance the security of web applications by filtering and monitoring HTTP traffic. However, a recent vulnerability has been identified that could potentially compromise the security of applications utilizing this package.
Vulnerability Detail
The vulnerability identified as CVE-2025-47947 allows for potential unauthorized access or manipulation of data due to improper validation of user input. This flaw can be exploited by attackers to execute arbitrary commands or gain elevated privileges, leading to severe security breaches. The issue originates from a flaw in the input handling mechanism of modsecurity-apache, which fails to adequately sanitize user inputs, making it susceptible to various types of attacks.
How To Fix
Minimum fixed version
2.9.3-3+deb11u3
This is the first release that contains the fix.
sudo apt-get install --only-upgrade modsecurity-apacheTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can disable the modsecurity-apache module until the package is updated. This can be done by executing the command: 'sudo a2dismod modsecurity'. However, this is not a permanent solution and should only be used until the package is updated.
Conclusion
The modsecurity-apache package has a critical vulnerability (CVE-2025-47947) that poses significant risks to web applications. It is crucial to update to the patched version to ensure the security of your systems. Utilize tools like Vulert to monitor for vulnerabilities and maintain the integrity of your applications.
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FAQ
CVE-2025-47947 is a security vulnerability in the modsecurity-apache package that allows unauthorized access due to improper input validation.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to unauthorized data access, data manipulation, and potential system compromise.
Yes, a patched version of modsecurity-apache (2.9.3-3+deb11u3) is available. It is recommended to update to this version.
If you cannot update immediately, consider disabling the modsecurity-apache module as a temporary workaround until you can apply the patch.
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