{"id":23443,"date":"2025-04-15T05:11:46","date_gmt":"2025-04-15T05:11:46","guid":{"rendered":""},"modified":"2025-05-19T11:36:49","modified_gmt":"2025-05-19T11:36:49","slug":"cve-2025-20936-escalation-of-privileges-through-improper-access-control-in-hdcp-trustlet","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20936-escalation-of-privileges-through-improper-access-control-in-hdcp-trustlet\/","title":{"rendered":"<strong>CVE-2025-20936: Escalation of Privileges through Improper Access Control in HDCP Trustlet<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>Unveiling a vulnerability that hits close to the core of system security, CVE-2025-20936 brings to light a flaw in the HDCP trustlet that can be exploited by local attackers to escalate their privileges to root. This vulnerability is particularly concerning as it gives attackers the potential to compromise the entire system or leak sensitive data, posing a significant risk to both the integrity and confidentiality of information.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3248-critical-code-injection-vulnerability-in-langflow-versions-prior-to-1-3-0\/\"  data-wpil-monitor-id=\"30436\">vulnerability affects devices prior<\/a> to the SMR Apr-2025 Release 1 and has been given a high CVSS Severity Score of 8.8, indicating its potential for severe damage and the urgency for its mitigation. It is of paramount importance to address this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-21673-high-impact-remote-code-execution-vulnerability-in-confluence-data-center-and-server\/\"  data-wpil-monitor-id=\"28938\">vulnerability promptly to minimize its potential impact<\/a> on affected systems.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-20936<br \/>\nSeverity: High (8.8)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-11861-critical-command-injection-vulnerability-in-enersys-ampa-granting-privileged-remote-shell-access\/\"  data-wpil-monitor-id=\"45240\">Shell Privilege<\/a><br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-0576-critical-vulnerability-in-totolink-lr1200gb-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"30072\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2682925863\" 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>HDCP Trustlet | Prior to SMR Apr-2025 Release 1<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>CVE-2025-20936 is based on <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-49647-an-in-depth-look-at-the-zoom-desktop-client-improper-access-control-vulnerability\/\"  data-wpil-monitor-id=\"26911\">improper access control<\/a> in the HDCP trustlet. A local attacker with shell <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-33472-scada-lts-remote-privilege-escalation-vulnerability\/\"  data-wpil-monitor-id=\"26908\">privilege can take advantage of this flaw to escalate<\/a> their privileges to root. This is achieved by manipulating the trustlet, which is supposed to be a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32953-security-vulnerability-in-z80pack-emulator-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"45241\">secured part of the system<\/a> responsible for handling sensitive operations. However, due to the improper access control, the attacker can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-0056-microsoft-sql-data-provider-security-feature-bypass-vulnerability\/\"  data-wpil-monitor-id=\"30437\">bypass the trustlet&#8217;s security<\/a> mechanisms, gaining root access and potentially compromising the entire system or leaking sensitive data.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3781550764\" 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 how the <a href=\"https:\/\/www.ameeba.com\/blog\/fortinet-s-fortigate-vulnerability-ssl-vpn-symlink-exploit-puts-user-access-at-risk-post-patching\/\"  data-wpil-monitor-id=\"30071\">vulnerability might be exploited<\/a>. It demonstrates how an attacker with shell <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23391-incorrect-privilege-assignment-in-suse-rancher-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"33072\">privilege might manipulate the system<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\"># Attacker gains shell privilege\n$ ssh user@target.example.com\n# Attacker exploits the vulnerability to escalate privileges to root\n$ echo &quot;exploit_code&quot; &gt; \/dev\/hdcp\/trustlet\n# Attacker now operates with root privileges\n$ whoami\nroot<\/code><\/pre>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>It&#8217;s recommended to apply the vendor patch to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-51063-understanding-and-mitigating-a-dom-based-xss-vulnerability-in-qstar-archive-solutions\/\"  data-wpil-monitor-id=\"28032\">mitigate this vulnerability<\/a>. However, if the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can monitor and block suspicious activities or traffic, helping to safeguard the system until the patch can be applied. Regularly updating and patching <a href=\"https:\/\/www.ameeba.com\/blog\/betting-on-cybersecurity-a-comparative-analysis-of-cisco-systems-and-okta-stocks\/\"  data-wpil-monitor-id=\"28937\">systems is a crucial part of maintaining cybersecurity<\/a>, and this vulnerability serves as a stern reminder of the importance of these practices.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview Unveiling a vulnerability that hits close to the core of system security, CVE-2025-20936 brings to light a flaw in the HDCP trustlet that can be exploited by local attackers to escalate their privileges to root. This vulnerability is particularly concerning as it gives attackers the potential to compromise the entire system or leak sensitive [&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":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-23443","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/23443","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=23443"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/23443\/revisions"}],"predecessor-version":[{"id":40442,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/23443\/revisions\/40442"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=23443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=23443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=23443"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=23443"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=23443"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=23443"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=23443"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=23443"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=23443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}