Released in 2015, is an older version of the Apache web server that contains several significant security vulnerabilities. Because it predates numerous critical patches, systems still running this version are highly susceptible to exploits ranging from Denial of Service (DoS) to Local Root Privilege Escalation .
Systems using the mod_session_crypto module for managing user sessions are vulnerable to a cryptographic exploit. Apache HTTP Server 2.4 vulnerabilities
This results in a "stream-processing outage," effectively crashing the web service for all other users. 3. Padding Oracle Attack (CVE-2016-0736) apache httpd 2.4.18 exploit
Apache 2.4.18 was among the first versions to support the protocol via mod_http2 . However, early implementations lacked sufficient resource limits.
This is a memory corruption vulnerability in the Apache Scoreboard , a shared memory area used by the main process (running as root) to track child processes (running with low privileges like www-data ). Released in 2015, is an older version of
The following article details the primary vulnerabilities, how they are exploited, and how to secure your environment.
Perhaps the most dangerous exploit for version 2.4.18 is , also known as "CARPE (DIEM)". Apache HTTP Server 2
The server failed to limit the number of simultaneous stream workers for a single HTTP/2 connection.
A malicious script (e.g., PHP or CGI) running with low privileges can modify the scoreboard to point to a malicious function. When the Apache server undergoes a graceful restart —typically triggered daily by automated tasks like logrotate —the parent root process executes the malicious code, granting the attacker full root access to the server. Impact: Complete server takeover. 2. HTTP/2 Denial of Service (CVE-2016-1546)
1. Critical Exploit: Local Root Privilege Escalation (CVE-2019-0211)