Apache HTTP Server Vulnerability: CVE-2020-1927 - Redirects Misconfiguration
Summary
UBUNTU-CVE-2020-1927: In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request U... Affects apache2 versions 2.4.6-2ubuntu2 – 2.4.7-1ubuntu4.9. No fix is published. How to fix ↓
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Background
Apache HTTP Server 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 extensive feature set, including support for various modules that enhance its capabilities. The vulnerability CVE-2020-1927 affects versions 2.4.0 to 2.4.41, where misconfigured redirects using mod_rewrite can be exploited, leading to unexpected URL redirections.
Vulnerability Detail
In Apache HTTP Server versions 2.4.0 to 2.4.41, a vulnerability exists in the mod_rewrite module that allows attackers to manipulate self-referential redirects. By encoding newlines in the request URL, an attacker can redirect users to unintended URLs, potentially leading to phishing attacks or other malicious activities. This vulnerability can compromise the integrity of the web application and affect user trust.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If immediate patching is not feasible, consider disabling mod_rewrite or implementing strict input validation to prevent encoded newlines in URLs. This can help mitigate the risk until the server can be updated.
Conclusion
CVE-2020-1927 is a significant vulnerability in Apache HTTP Server that can lead to serious security risks through misconfigured redirects. It is crucial to update to a patched version to safeguard against potential exploitation. Regular monitoring and vulnerability management practices, such as using tools like Vulert, can help maintain the security of your applications.
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FAQ
CVE-2020-1927 is a vulnerability in Apache HTTP Server that allows for misconfigured redirects, potentially leading to unintended URL redirections.
The vulnerability affects Apache HTTP Server versions 2.4.0 to 2.4.41.
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 for CVE-2020-1927 is 6.1, indicating a medium severity level.
If immediate updates are not possible, consider disabling mod_rewrite or implementing strict input validation as a temporary workaround.
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