{"id":36793,"date":"2025-05-09T18:57:05","date_gmt":"2025-05-09T18:57:05","guid":{"rendered":""},"modified":"2025-05-24T17:20:54","modified_gmt":"2025-05-24T17:20:54","slug":"cve-2025-27920-directory-traversal-vulnerability-in-output-messenger","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-27920-directory-traversal-vulnerability-in-output-messenger\/","title":{"rendered":"<strong>CVE-2025-27920: Directory Traversal Vulnerability in Output Messenger<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The Common Vulnerabilities and Exposures (CVE) system has identified a critical vulnerability in Output Messenger, a popular communication tool used by many businesses. This vulnerability, tagged as CVE-2025-27920, could potentially allow attackers to access sensitive files outside the intended directory. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34087-code-execution-vulnerability-in-gtkwave-3-3-115-through-improper-array-index-validation\/\"  data-wpil-monitor-id=\"41543\">vulnerability occurs due to the application&#8217;s improper<\/a> handling of file paths, leading to a possible directory traversal attack. Its criticality is underlined by the CVSS Severity Score of 9.8, which underscores the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4372-webaudio-heap-corruption-in-google-chrome-a-potential-gateway-to-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"49399\">potential for severe damage and data<\/a> leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-27920<br \/>\nSeverity: Critical (CVSS: 9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32974-critical-vulnerability-in-xwiki-s-rights-analysis-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"42390\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-217327797\" 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>Output Messenger | Versions before 2.0.63<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4083-process-isolation-vulnerability-in-thunderbird-and-firefox-due-to-improper-handling-of-javascript-uris\/\"  data-wpil-monitor-id=\"41664\">improper file path handling<\/a> within Output Messenger. By using &#8216;..\/&#8217; sequences in parameters, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-47663-unauthenticated-remote-attacker-gaining-full-access-due-to-improper-json-web-tokens-implementation\/\"  data-wpil-monitor-id=\"41634\">attackers can manipulate the file path to access<\/a> directories and files outside of the intended scope. This directory traversal <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-49129-stack-overflow-vulnerability-in-solid-edge-se2023-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"43546\">allows them to potentially<\/a> access sensitive files, configurations, and data that would otherwise be off-limits.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2559496427\" 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>Here&#8217;s a conceptual example of how this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47154-exploitation-of-use-after-free-vulnerability-in-libjs-in-ladybird\/\"  data-wpil-monitor-id=\"42389\">vulnerability might be exploited<\/a>. This example simulates a malicious HTTP request, utilizing directory traversal to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43564-improper-access-control-vulnerability-in-coldfusion-leading-to-arbitrary-file-system-read\/\"  data-wpil-monitor-id=\"49398\">access a sensitive configuration file<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">GET \/download.php?file=..\/..\/..\/..\/etc\/passwd HTTP\/1.1\nHost: vulnerablemessenger.example.com<\/code><\/pre>\n<p>In this example, the &#8220;..\/&#8221; sequence is used to move up in the directory structure. As a result, instead of accessing a file within the intended directory, the attacker could potentially access and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3404-wordpress-download-manager-arbitrary-file-deletion-vulnerability\/\"  data-wpil-monitor-id=\"41701\">download the &#8216;\/etc\/passwd&#8217; file<\/a>, a sensitive file containing user account information on a Unix-based system.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users of Output Messenger are urged to update their software to version 2.0.63 or later, where the vulnerability has been patched. If immediate update isn&#8217;t possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure, providing some level of protection against <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-36864-integer-overflow-vulnerability-in-gtkwave-3-3-115-with-potential-for-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"42495\">potential attacks exploiting this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The Common Vulnerabilities and Exposures (CVE) system has identified a critical vulnerability in Output Messenger, a popular communication tool used by many businesses. This vulnerability, tagged as CVE-2025-27920, could potentially allow attackers to access sensitive files outside the intended directory. The vulnerability occurs due to the application&#8217;s improper handling of file paths, leading 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":[],"product":[],"attack_vector":[85],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-36793","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-directory-traversal"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/36793","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=36793"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/36793\/revisions"}],"predecessor-version":[{"id":44040,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/36793\/revisions\/44040"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=36793"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=36793"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=36793"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=36793"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=36793"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=36793"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=36793"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=36793"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=36793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}