Apache HTTP Server 2.4.38 is running on thousands of websites worldwide, but it contains 6 significant security vulnerabilities that put your data and users at risk. Three of these are classified as HIGH severity, including flaws that allow attackers to bypass authentication, execute arbitrary code, and access restricted resources. If your website still uses Apache 2.4.38, you need to take action immediately to protect against potential breaches.
In this comprehensive guide, we'll walk you through identifying whether your server is vulnerable, understanding the specific threats posed by each CVE, and implementing the security patches your site needs. Whether you're a site owner, developer, or system administrator, understanding these vulnerabilities is crucial for maintaining web security.
Apache HTTP Server is one of the most widely used open-source web servers, powering approximately 31% of all websites on the internet. Version 2.4.38, released in 2019, was designed to improve performance and security, but subsequent research discovered multiple vulnerabilities that weren't patched until later versions. This version remains in use on thousands of sites, often because administrators haven't prioritized updates or are unaware of the security risks.
The vulnerabilities in Apache 2.4.38 span multiple modules including mod_ssl, mod_auth_digest, and HTTP/2 handling. They range from privilege escalation attacks where low-level processes can gain administrator access, to authentication bypass flaws that allow unauthorized users to access restricted content. Understanding what makes version 2.4.38 vulnerable is the first step toward protecting your website from sophisticated attacks that target these known weaknesses.
6 CVEs found. The most critical are explained below.
A flaw allows malicious code running in less-privileged areas of Apache to break out and gain the highest level of system access. This is like a burglar finding a way from a storage room to your main office safe.
Impact: An attacker could take complete control of your website and server, steal all data, modify files, or use your server to attack others.
↗ View on NVDA bug in Apache's security system (TLSv1.3) allows unauthorized users to bypass certificate-based access controls you've set up. Users who shouldn't have access can gain entry anyway.
Impact: People you blocked from sensitive areas of your site could gain unauthorized access to protected content or resources.
↗ View on NVDA timing flaw in Apache's password system allows someone with valid login credentials to impersonate another user. It's like using one key to unlock another person's locker.
Impact: Attackers could log in as different users without knowing their passwords, accessing accounts and private data they shouldn't see.
↗ View on NVDAttackers can use double slashes in website URLs to confuse Apache's security filters, making restricted content visible. It's a loophole in how the server reads web addresses.
Impact: Restricted pages or files you thought were protected might become accessible to unauthorized visitors.
↗ View on NVDA bug in Apache's HTTP/2 handling can cause the server to access deleted memory, leading to crashes or incorrect request processing. This happens when attackers send specially crafted data.
Impact: Your website could crash repeatedly, causing downtime. Attackers could also manipulate how requests are processed.
↗ View on NVDWhen Apache tries to upgrade connections from older HTTP to newer HTTP/2, a bug can cause configuration errors and server crashes. This happens with specific server setups.
Impact: Your website could experience crashes or service interruptions, especially affecting users upgrading their connections.
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Securing Apache 2.4.38 isn't optional—it's essential for protecting your website, your users' data, and your business reputation. The three HIGH severity vulnerabilities alone pose serious risks including arbitrary code execution and authentication bypass. By following this guide and updating to a patched version immediately, you eliminate these attack vectors and significantly improve your security posture.
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