Apache 2.4.29 contains four significant security vulnerabilities that put thousands of websites at risk. Over 6,600 websites are currently running this outdated version, exposing their servers to potential attacks including authentication bypasses, file upload exploits, and session hijacking. This comprehensive guide explains each vulnerability in plain language and provides step-by-step instructions to protect your server.
The vulnerabilities range from critical to medium severity, with the most dangerous being a flawed digest authentication system that could allow attackers to forge legitimate requests. If your website runs Apache 2.4.29, taking immediate action is essential to maintain security and protect your users' data.
Understanding these risks doesn't require deep technical knowledge. This article breaks down what each vulnerability means, who it affects, and exactly what you need to do to fix it.
Apache is the software that powers websites by responding to visitor requests and delivering web pages. Think of it like a receptionist at a busy office—it receives requests from browsers, processes them, and sends back the appropriate web pages. Apache 2.4.29 is a specific version released in 2018 that many website administrators continue using today, either because their hosting hasn't updated them or because they're running older systems.
When Apache receives updates and new versions, it's almost always because developers have discovered security problems in the old version. Apache 2.4.29 is no exception—it has multiple documented security flaws that attackers actively exploit. Running an outdated version is like leaving doors unlocked on your house; even if no one enters today, you're making it easy for bad actors to access your website's data and compromise your server.
4 CVEs found. The most critical are explained below.
Your Apache server generates security codes to prevent attackers from replaying old login attempts. If you run multiple servers sharing the same login setup, these security codes aren't random enough, making them predictable.
Impact: An attacker could reuse captured login sessions to access user accounts without knowing passwords, especially if you operate multiple connected servers.
↗ View on NVDYour website can block certain file uploads using filename rules. Due to a flaw in how Apache checks filenames, attackers can use hidden characters to trick the system and upload restricted files anyway.
Impact: Attackers could upload dangerous files (like scripts) that bypass your security filters, potentially compromising your website and visitor data.
↗ View on NVDIf your site uses directory-based login (LDAP), Apache mishandles special character encoding based on language preferences. An attacker can send crafted requests to interfere with credential verification.
Impact: Attackers could gain unauthorized access or cause authentication failures for legitimate users if you use directory-based login systems.
↗ View on NVDIf your Apache is configured to pass session information to custom applications, attackers can inject fake session data through HTTP headers to manipulate how the application behaves.
Impact: Attackers could impersonate users or modify their session information if you use custom applications that receive session data from Apache.
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Apache 2.4.29 contains serious vulnerabilities that directly threaten your website's security. The critical digest authentication flaw alone could allow attackers to bypass your login systems, while the other vulnerabilities create additional attack vectors. Upgrading to a newer version is straightforward and essential—the longer you wait, the higher your risk of compromise.
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