| Action | Command / Configuration | |--------|--------------------------| | | sudo apt-get upgrade apache2 (or compile 2.4.58+) | | Disable HTTP/2 | Protocols http/1.1 in httpd.conf | | Remove mod_cgi/cgid | sudo a2dismod cgi cgid | | Set ProxyRequest Off | Prevents HTTPOXY (Not a complete fix) | | Deploy WAF rule | Block Proxy header containing http:// or Proxy: * |
Exploitation vectors for Apache 2.4.18 vary based on the attacker's initial access level. Remote Attacks
Understanding the Apache HTTPD 2.4.18 Vulnerability Landscape apache httpd 2.4.18 exploit
The Apache Software Foundation has addressed this vulnerability in Apache HTTP Server version 2.4.23. Therefore, one of the most straightforward mitigations is to update to a version of Apache that is not vulnerable.
Several Common Vulnerabilities and Exposures (CVEs) apply directly to version 2.4.18. The most significant risks stem from core architectural components, specifically the HTTP/2 module ( mod_http2 ) and the XML parsing capabilities. 1. Denial of Service via HTTP/2 (CVE-2016-8740) Denial of Service via HTTP/2 (CVE-2016-8740) Apache httpd
Apache httpd 2.4.18 ──► [CVE-2019-0211] ──► Manipulates Scoreboard ──► Local Root Escalation ──► [CVE-2019-0196] ──► Fuzzes HTTP/2 Input ──► Memory Corruption / DoS ──► [CVE-2016-4979] ──► Bypasses X.509 Auth ──► Unauthorized Access 1. Local Root Privilege Escalation (CVE-2019-0211)
Once they had exploited the vulnerability, they had uploaded a malicious Lua script that allowed them to execute system commands on the server. The script was cleverly disguised as a legitimate configuration file, but John was able to spot it using his monitoring tools. apache httpd 2.4.18 exploit
: It is a use-after-free bug that occurs when the server processes an OPTIONS request.
Disclaimer: This article is for educational and security awareness purposes only. Never test exploits on systems you do not own or have explicit permission to test.
Apache utilizes a shared memory segment called the to keep track of worker child processes and tracking metrics (such as active connections and process IDs).