{"id":64152,"date":"2025-08-18T20:50:26","date_gmt":"2025-08-18T20:50:26","guid":{"rendered":""},"modified":"2025-10-04T00:32:21","modified_gmt":"2025-10-04T06:32:21","slug":"cve-2025-49679-numeric-truncation-error-in-windows-shell-leading-to-privilege-escalation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-49679-numeric-truncation-error-in-windows-shell-leading-to-privilege-escalation\/","title":{"rendered":"<strong>CVE-2025-49679: Numeric Truncation Error in Windows Shell Leading to Privilege Escalation<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity world is constantly evolving, and with it, new vulnerabilities arise. One such vulnerability that has recently come to light is CVE-2025-49679. This flaw lies in the Windows Shell and allows an authorized attacker to elevate their privileges locally, <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=\"72078\">leading to potential system<\/a> compromise or data leakage. It <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50160-heap-based-buffer-overflow-in-windows-rras-posing-system-compromise-risk\/\"  data-wpil-monitor-id=\"78482\">poses a significant risk to all Windows<\/a> users, considering the wide usage of this operating system in businesses and personal computing alike. Understanding this vulnerability, its impact, and how to mitigate it is crucial in maintaining a secure digital environment.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-49679<br \/>\nSeverity: High (7.8)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: User-level<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27055-memory-corruption-leads-to-potential-system-compromise-during-image-encoding\/\"  data-wpil-monitor-id=\"74202\">System compromise<\/a>, data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-39408058\" 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>Windows | 10, 11<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a numeric truncation error in the Windows Shell. The attacker, who must already have user-level access, can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-25180-underprivileged-software-manipulates-gpu-system-calls-for-unauthorized-access\/\"  data-wpil-monitor-id=\"88765\">manipulate certain numeric values within the system&#8217;s<\/a> shell, causing it to truncate incorrectly. This truncation error can be exploited to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53762-privilege-elevation-vulnerability-in-microsoft-purview\/\"  data-wpil-monitor-id=\"72926\">elevate the user&#8217;s privileges<\/a> from a normal user to an administrator. With these <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6754-privilege-escalation-vulnerability-in-seo-metrics-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"72731\">escalated privileges<\/a>, the attacker can execute commands or access resources that are normally beyond their reach, leading to potential system compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2326936706\" 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>Let&#8217;s consider a conceptual example of how this vulnerability might be exploited. The attacker could use a shell command like the one below, where &#8216;malicious_payload&#8217; is a carefully crafted numeric value that triggers the truncation error.<\/p>\n<pre><code class=\"\" data-line=\"\">$ echo &#039;malicious_payload&#039; &gt; \/proc\/sys\/kernel\/some_setting<\/code><\/pre>\n<p>In this example, the &#8216;echo&#8217; command is used to write the &#8216;malicious_payload&#8217; to a particular kernel setting. If the payload is crafted correctly, it could cause a numeric truncation error, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33075-a-critical-windows-installer-vulnerability-that-leads-to-privilege-elevation\/\"  data-wpil-monitor-id=\"72342\">leading to a privilege<\/a> escalation.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the latest vendor patches as soon as they become available. It is crucial to ensure that all systems are regularly updated to prevent exploitation.<br \/>\nAs a temporary measure, users can also utilize Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) to monitor and block suspicious activities. However, these measures are not foolproof, and the best course of action is always to apply the necessary patches promptly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity world is constantly evolving, and with it, new vulnerabilities arise. One such vulnerability that has recently come to light is CVE-2025-49679. This flaw lies in the Windows Shell and allows an authorized attacker to elevate their privileges locally, leading to potential system compromise or data leakage. It poses a significant risk to [&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":[88,82],"product":[95],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64152","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","vendor-microsoft","product-linux-kernel","attack_vector-privilege-escalation"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64152","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=64152"}],"version-history":[{"count":7,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64152\/revisions"}],"predecessor-version":[{"id":81575,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64152\/revisions\/81575"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64152"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64152"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64152"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64152"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64152"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64152"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}