{"id":64159,"date":"2025-08-19T03:52:49","date_gmt":"2025-08-19T03:52:49","guid":{"rendered":""},"modified":"2025-11-02T15:08:01","modified_gmt":"2025-11-02T21:08:01","slug":"cve-2025-49693-a-deep-dive-into-double-free-vulnerability-in-microsoft-brokering-file-system","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49693-a-deep-dive-into-double-free-vulnerability-in-microsoft-brokering-file-system\/","title":{"rendered":"<strong>CVE-2025-49693: A Deep Dive into Double Free Vulnerability in Microsoft Brokering File System<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the constantly evolving realm of cybersecurity, there&#8217;s an urgent call to stay informed about the latest threats and vulnerabilities. This article will delve into the intricacies of CVE-2025-49693, a critical flaw in the Microsoft Brokering File System. This vulnerability affects a wide range of users, primarily those using Microsoft&#8217;s file system, and poses a severe threat due to its potential to allow an authorized attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53762-privilege-elevation-vulnerability-in-microsoft-purview\/\"  data-wpil-monitor-id=\"72905\">elevate privileges<\/a> locally. It is a cause for concern as it provides a gateway for <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74949\">potential system compromise or data<\/a> leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-49693<br \/>\nSeverity: High (7.8 CVSS Severity Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: High (Authorized <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3498-unauthenticated-user-access-and-modification-of-radiflow-isap-smart-collector-configuration\/\"  data-wpil-monitor-id=\"92256\">access to a user<\/a> account)<br \/>\nUser Interaction: None required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47962-unauthorized-privilege-elevation-in-windows-sdk\/\"  data-wpil-monitor-id=\"74056\">Elevation of privileges<\/a>, Potential system compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1293765547\" 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: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\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: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\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: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>Microsoft Brokering File System | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55010-arbitrary-php-object-instantiation-in-kanboard-prior-to-version-1-2-47\/\"  data-wpil-monitor-id=\"77928\">versions prior<\/a> to patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43193-critical-memory-handling-vulnerability-in-macos\/\"  data-wpil-monitor-id=\"71708\">vulnerability lies in the improper handling of memory<\/a> objects in the Microsoft Brokering File System. When an object is freed twice, it can cause a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27031-memory-corruption-via-ioctl-commands-processing\/\"  data-wpil-monitor-id=\"71596\">memory corruption<\/a> issue known as &#8216;double free. This corruption could allow an attacker, who already has local access to the system, to manipulate the system&#8217;s memory and execute <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30327-integer-overflow-vulnerability-in-incopy-leading-to-potential-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"73677\">arbitrary code<\/a>. This could result in an unauthorized elevation of privileges, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49691-heap-based-buffer-overflow-in-windows-media-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"72174\">potentially leading to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2550289631\" 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 conceptual example below <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49526-out-of-bounds-write-vulnerability-in-illustrator-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"75153\">illustrates how an attacker might exploit this vulnerability<\/a>. This pseudocode represents a malicious code segment that an attacker might use to trigger the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47168-use-after-free-vulnerability-in-microsoft-office-word-allowing-unauthorized-code-execution\/\"  data-wpil-monitor-id=\"73104\">double<\/a> free vulnerability.<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;stdlib.h&gt;\nint main() {\nchar *buffer = malloc(256); \/\/Allocate memory for buffer\nfree(buffer); \/\/Free the allocated memory\n\/\/... Some code here ...\nfree(buffer); \/\/Attempt to free the already freed memory causing double free vulnerability\n\/\/... More malicious code here ...\nreturn 0;\n}<\/code><\/pre>\n<p>Please note that this is a simplified example and real-world exploits would be more complex and tailored to the specific software and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2022-43110-critical-unauthenticated-remote-system-configuration-vulnerability-in-voltronic-power-viewpower-powershield-netguard\/\"  data-wpil-monitor-id=\"83141\">system configurations<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate the risks posed by CVE-2025-49693, users are strongly advised to apply the patch provided by the vendor as soon as possible. In the interim, or for those unable to apply the patch immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary mitigation. These <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27046-critical-memory-corruption-vulnerability-threatening-system-integrity\/\"  data-wpil-monitor-id=\"75074\">systems can detect and block attempts to exploit this vulnerability<\/a>, thus providing an additional layer of protection.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the constantly evolving realm of cybersecurity, there&#8217;s an urgent call to stay informed about the latest threats and vulnerabilities. This article will delve into the intricacies of CVE-2025-49693, a critical flaw in the Microsoft Brokering File System. This vulnerability affects a wide range of users, primarily those using Microsoft&#8217;s file system, and poses [&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":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64159","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-privilege-escalation"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64159","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=64159"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64159\/revisions"}],"predecessor-version":[{"id":85472,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64159\/revisions\/85472"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64159"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64159"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64159"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64159"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64159"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64159"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64159"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}