Exploit: Apache Httpd 2.4.46
POST /cgi-bin/.%2e/bin/bash HTTP/1.1 Host: vulnerable-server.com Content-Type: application/x-www-form-urlencoded
: Test in an isolated lab environment. Public PoCs exist on GitHub for CVE-2021-40438 and CVE-2020-11984 – analyze those only for defensive understanding.
The first vulnerability, CVE-2021-41773, was publicly disclosed in October 2021. This issue arises from a path traversal vulnerability in the Apache HTTP Server. An attacker could exploit this vulnerability by manipulating URLs in a way that accesses files, directories, or other server resources outside the document root. Additionally, under certain configurations, this vulnerability could also lead to a denial of service (DoS) condition.
The discovery of CVE-2021-41773 and CVE-2021-42013 in Apache httpd underscores the importance of keeping server software up to date to protect against potential exploits. By understanding the nature of these vulnerabilities and taking steps to mitigate them, system administrators and organizations can significantly reduce the risk of their servers being compromised. apache httpd 2.4.46 exploit
CVSS 4.0 Severity and Vector Strings: NIST: NVD. N/A. NVD assessment not yet provided. CVSS 3.x Severity and Vector Strings: NIST: National Institute of Standards and Technology (.gov) CVE-2021-26690 Detail - NVD
(mod_proxy SSRF): A request-smuggling-like flaw in mod_proxy allows a crafted request to forward requests to an arbitrary origin server. This affects 2.4.48 and earlier, including 2.4.46. Impact : Server-side request forgery, potentially exposing internal services.
GET /icons/.%2e/ HTTP/1.1 Host: vulnerable-server.com POST /cgi-bin/
Users of version 2.4.46 are strongly recommended to , which addresses these vulnerabilities. Official security advisories can be found on the Apache HTTP Server Security page . Apache HTTP Server 2.4 vulnerabilities
If the server is vulnerable and the request is properly crafted, this could lead to remote code execution.
However, I can give you about known vulnerabilities affecting that version: This issue arises from a path traversal vulnerability
(mod_http2 memory corruption on early hints): Affects 2.4.46 – HTTP/2 103 responses can trigger memory corruption. Impact : Denial of service or potentially RCE.
(Null pointer dereference in mod_http2): Maliciously crafted HTTP/2 requests can crash the child process. Affects 2.4.46 if built with HTTP/2 support. Impact : DoS via repeated requests.
The exploitation of CVE-2021-42013 involves a similar approach to CVE-2021-41773 but with the potential for more severe impacts. An attacker could craft a request that not only traverses the file system but also injects code, potentially leading to a fully compromised server.