{"id":84693,"date":"2025-10-26T20:34:24","date_gmt":"2025-10-26T20:34:24","guid":{"rendered":""},"modified":"2025-10-29T08:17:16","modified_gmt":"2025-10-29T14:17:16","slug":"cve-2025-36903-local-privilege-escalation-through-improper-input-validation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-36903-local-privilege-escalation-through-improper-input-validation\/","title":{"rendered":"<strong>CVE-2025-36903: Local Privilege Escalation through Improper Input Validation<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-36903 is a critical security vulnerability that potentially allows an attacker to perform an out-of-bounds read\/write operation due to improper input validation. This vulnerability is particularly concerning as it can lead to a local escalation of privilege, potentially compromising system security and leading to data leakage. User interaction is not necessary for the exploitation of this vulnerability, increasing its potential impact.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-36903<br \/>\nSeverity: High (7.8)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Not Required<br \/>\nImpact: Local escalation of privileges <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20681-wlan-ap-driver-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"91604\">leading to potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3188938112\" 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>lwis_io | All prior to version x.y.z<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32709-critical-use-after-free-vulnerability-in-windows-ancillary-function-driver-for-winsock\/\"  data-wpil-monitor-id=\"91732\">vulnerability arises from the lwis_io_buffer_write function<\/a>, which fails to properly validate input data. This failure can allow an attacker to initiate an out-of-bounds (OOB) read\/write operation. These operations can access or modify data that is outside the intended boundary of a buffer, leading to corruption of relevant data, a crash, or <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42967-remote-code-execution-vulnerability-in-sap-s-4hana-and-sap-scm-characteristic-propagation\/\"  data-wpil-monitor-id=\"91611\">code execution<\/a>. In this case, the OOB operation could lead to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20683-local-privilege-escalation-due-to-incorrect-bounds-check-in-wlan-ap-driver\/\"  data-wpil-monitor-id=\"91785\">local escalation of privileges<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3362942173\" 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>Below is a conceptual example of an exploit. The malicious payload is designed to trigger the OOB operation, taking advantage of the improper input validation.<\/p>\n<pre><code class=\"\" data-line=\"\">$ .\/lwis_io_buffer_write --input &quot;malicious_payload&quot;<\/code><\/pre>\n<p>This example is purely conceptual. The &#8220;malicious_payload&#8221; would be specifically crafted to exploit the OOB vulnerability.<\/p>\n<p><strong>Mitigation Measures<\/strong><\/p>\n<p>Users are advised to apply the vendor patch as soon as it becomes available. If the patch is not yet available or cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-36903 is a critical security vulnerability that potentially allows an attacker to perform an out-of-bounds read\/write operation due to improper input validation. This vulnerability is particularly concerning as it can lead to a local escalation of privilege, potentially compromising system security and leading to data leakage. User interaction is not necessary for the exploitation [&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":[],"product":[],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-84693","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-privilege-escalation"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/84693","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=84693"}],"version-history":[{"count":4,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/84693\/revisions"}],"predecessor-version":[{"id":84960,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/84693\/revisions\/84960"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=84693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=84693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=84693"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=84693"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=84693"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=84693"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=84693"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=84693"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=84693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}