{"id":38946,"date":"2025-05-17T13:19:31","date_gmt":"2025-05-17T13:19:31","guid":{"rendered":""},"modified":"2025-09-14T23:37:01","modified_gmt":"2025-09-15T05:37:01","slug":"cve-2025-4561-arbitrary-file-upload-vulnerability-in-kingfor-s-kfox","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4561-arbitrary-file-upload-vulnerability-in-kingfor-s-kfox\/","title":{"rendered":"<strong>CVE-2025-4561: Arbitrary File Upload Vulnerability in KingFor&#8217;s KFOX<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>Cybersecurity threats are ever-present, and in this post, we will be focusing on a significant vulnerability discovered in KingFor&#8217;s KFOX. Identified as CVE-2025-4561, this vulnerability allows for an arbitrary file upload, potentially leading to severe security breaches. It affects systems running KFOX and can be exploited by <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32819-remote-attacker-bypassing-path-traversal-checks-in-sma100\/\"  data-wpil-monitor-id=\"44106\">remote attackers<\/a> with regular privileges. It is crucial to understand this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4347-d-link-router-buffer-overflow-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"43574\">vulnerability as it can lead to a potential system<\/a> compromise and data leakage, posing a serious threat to confidentiality, integrity, and availability of data.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-4561<br \/>\nSeverity: High (CVSS: 8.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low (Regular privileges)<br \/>\nUser Interaction: None<br \/>\nImpact: <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=\"43784\">Potential system compromise and data<\/a> leakage.<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3925297529\" 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>KingFor&#8217;s KFOX | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47269-session-token-exposure-in-code-server-prior-to-version-4-99-4\/\"  data-wpil-monitor-id=\"46761\">versions prior<\/a> to the patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by taking advantage of a flaw in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47549-critical-unrestricted-file-upload-vulnerability-in-themefic-beaf\/\"  data-wpil-monitor-id=\"43890\">file upload<\/a> feature of KFOX. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-0984-critical-file-upload-and-xss-vulnerability-in-netoloji-software-e-flow\/\"  data-wpil-monitor-id=\"43954\">vulnerability allows an attacker to upload<\/a> a malicious web shell backdoor onto the server. Once the web shell backdoor is uploaded and executed, the attacker can run arbitrary code on the server, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30165-potential-system-compromise-in-vllm-v0-engine\/\"  data-wpil-monitor-id=\"43997\">potentially compromising the system<\/a> and leading to data leakage. The threat actors can gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47733-server-side-request-forgery-in-microsoft-power-apps-leads-to-unauthorized-information-disclosure\/\"  data-wpil-monitor-id=\"44904\">unauthorized access to sensitive information<\/a>, manipulate system functionalities, and even use the compromised server as a launchpad for further attacks.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3529769168\" 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>An attacker could exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47462-cross-site-request-forgery-vulnerability-in-ohidul-islam-challan-leading-to-privilege-escalation\/\"  data-wpil-monitor-id=\"43657\">vulnerability by sending a malicious HTTP POST request<\/a> to the vulnerable endpoint, which might look something like this:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/file_upload HTTP\/1.1\nHost: target.example.com\nContent-Type: multipart\/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW\n------WebKitFormBoundary7MA4YWxkTrZu0gW\nContent-Disposition: form-data; name=&quot;file&quot;; filename=&quot;shell.php&quot;\nContent-Type: application\/x-php\n&lt;?php system($_GET[&#039;cmd&#039;]); ?&gt;\n------WebKitFormBoundary7MA4YWxkTrZu0gW--<\/code><\/pre>\n<p>In this conceptual example, the attacker is uploading a web shell (&#8220;shell.php&#8221;) that would allow them to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46193-remote-code-execution-vulnerability-in-sourcecodester-client-database-management-system-1-0\/\"  data-wpil-monitor-id=\"45309\">execute arbitrary system<\/a> commands on the server.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>The best mitigation <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46658-critical-security-vulnerability-in-exonautweb-s-4c-strategies-exonaut-21-6\/\"  data-wpil-monitor-id=\"82508\">strategy for this vulnerability<\/a> is to apply the vendor patch as soon as it becomes available. If the patch is not yet available, or if you cannot apply the patch immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to temporarily mitigate the risk by detecting and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3605-privilege-escalation-vulnerability-in-frontend-login-and-registration-blocks-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"46151\">blocking attempts to exploit this vulnerability<\/a>. Regularly updating and patching your systems, along with maintaining a robust security posture, are <a href=\"https:\/\/www.ameeba.com\/blog\/building-a-cybersecurity-first-culture-a-crucial-step-for-u-s-manufacturing\/\"  data-wpil-monitor-id=\"45636\">crucial steps<\/a> towards ensuring the safety of your digital assets.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview Cybersecurity threats are ever-present, and in this post, we will be focusing on a significant vulnerability discovered in KingFor&#8217;s KFOX. Identified as CVE-2025-4561, this vulnerability allows for an arbitrary file upload, potentially leading to severe security breaches. It affects systems running KFOX and can be exploited by remote attackers with regular privileges. It is [&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-38946","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\/38946","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=38946"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38946\/revisions"}],"predecessor-version":[{"id":75027,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/38946\/revisions\/75027"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=38946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=38946"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=38946"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=38946"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=38946"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=38946"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=38946"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=38946"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=38946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}