Httpd 2.4.18 Exploit [hot] - Apache
An unauthenticated remote attacker can flood the server with a malicious stream of HTTP/2 CONTINUATION frames . Because the server keeps allocating memory to process these infinite headers, it rapidly runs out of RAM, completely crashing the web server daemon and triggering a persistent Denial of Service state. Technical Comparison of Version 2.4.18 Flaws
The local attacker can escalate their privileges from standard web-server user ( www-data ) to full root access, taking total control of the hosting server. How Attackers Exploit Apache 2.4.18 apache httpd 2.4.18 exploit
that exposes systems to critical risks, including local root privilege escalation, authentication bypass, and severe Denial of Service (DoS) attacks . Released in late 2015, this specific build of the Apache HTTP Server contains fundamental design flaws within its core engine and popular modules like mod_http2 and mod_status . Because version 2.4.18 remains embedded in old enterprise environments and unpatched Linux distributions, understanding its exploit vectors is vital for security teams performing penetration testing or modernizing legacy infrastructure. Major Vulnerabilities and Exploit Mechanisms An unauthenticated remote attacker can flood the server
When the root process restarts, it executes an arbitrary function pointer from the fake structure. : Full system compromise. How Attackers Exploit Apache 2
| CVE ID | Description | Impact | Status | | :--- | :--- | :--- | :--- | | | | CVE-2019-10082 | Use-after-free in HTTP/2 session handling (2.4.18 to 2.4.39). | Critical – Potential Information Disclosure & Denial of Service. | Fixed in 2.4.40. | | CVE-2018-1302 | NULL pointer dereference in HTTP/2 stream shutdown. | Low – Crash possible, but difficult to trigger. | Fixed in 2.4.30. | | Access Control & Security Bypasses | | CVE-2016-8743 | Excessive liberal whitespace parsing in HTTP requests. | High – Request Smuggling & Response Splitting. | Fixed in 2.4.25. | | CVE-2017-15715 | <FilesMatch> directive bypass using a trailing newline. | Low – Bypass access restrictions. | Fixed in 2.4.30. | | Denial of Service (DoS) Vulnerabilities | | CVE-2016-1546 | Unbounded stream workers in HTTP/2, causing stream-processing outage. | Medium – DoS via resource exhaustion. | Fixed in 2.4.20. | | CVE-2016-8740 | Memory exhaustion via crafted CONTINUATION frames in HTTP/2. | Medium – DoS via memory exhaustion. | Fixed in 2.4.25. | | CVE-2016-2161 | Server crash via malicious input to mod_auth_digest . | Low – DoS via module crash. | Fixed in 2.4.25. | | CVE-2018-1303 | Out-of-bounds read in mod_cache_socache . | Low – DoS in misconfigured caching setups. | Fixed in 2.4.30. | | Information Disclosure & Miscellaneous | | CVE-2017-15710 | Out-of-bounds write in mod_authnz_ldap . | Low – Memory corruption risk, DoS likely. | Fixed in 2.4.30. | | CVE-2016-0736 | Padding Oracle vulnerability in mod_session_crypto . | Low – Session data risk if misused. | Fixed in 2.4.25. | | CNVD-2019-08943 | General security bypass vulnerability in httpd. | Not specified | Not specified |