{"id":60309,"date":"2025-08-07T07:15:38","date_gmt":"2025-08-07T07:15:38","guid":{"rendered":""},"modified":"2025-10-23T04:01:33","modified_gmt":"2025-10-23T10:01:33","slug":"cve-2024-48916-unvalidated-jwt-signatures-in-ceph-storage-systems","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2024-48916-unvalidated-jwt-signatures-in-ceph-storage-systems\/","title":{"rendered":"<strong>CVE-2024-48916: Unvalidated JWT Signatures in Ceph Storage Systems<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The vulnerability CVE-2024-48916 is a major concern for any organization using the Ceph storage platform. As a distributed object, block, and file storage platform, Ceph is integral to a wide range of IT systems and cloud networks. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43209-high-risk-out-of-bounds-access-vulnerability-affecting-multiple-apple-operating-systems\/\"  data-wpil-monitor-id=\"69679\">vulnerability affects<\/a> Ceph versions 19.2.3 and below, specifically in the RadosGW OIDC provider. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7549-critical-vulnerability-in-tenda-fh1201-allows-remote-stack-based-buffer-overflow\/\"  data-wpil-monitor-id=\"67712\">vulnerability allows<\/a> for unvalidated JSON Web Tokens (JWTs) to be sent, bypassing the signature check by using &#8220;none&#8221; as the JWT algorithm. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33054-insufficient-ui-warning-in-remote-desktop-client-opens-door-to-spoofing-attacks\/\"  data-wpil-monitor-id=\"68081\">opens the door<\/a> for potential system compromise or data leakage, which could have far-reaching consequences for any organization storing sensitive information on affected systems.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2024-48916<br \/>\nSeverity: High (CVSS 8.1)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <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=\"78586\">System compromise<\/a> or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-132770687\" 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>Ceph | 19.2.3 and below<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3931-yggdrasil-s-flaw-opens-door-to-local-privilege-escalation-and-system-compromise\/\"  data-wpil-monitor-id=\"91372\">flaw in the Ceph system&#8217;s<\/a> handling of JWTs. When a JWT with &#8220;none&#8221; as its algorithm is sent, the Ceph system does not validate the signature. This allows an attacker to forge JWTs, bypassing normal security checks and gaining <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5835-droip-plugin-for-wordpress-unauthorized-access-and-modification-vulnerability\/\"  data-wpil-monitor-id=\"69680\">unauthorized access<\/a> to the system. This vulnerability is most likely in the RadosGW OIDC provider, a component of the Ceph <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52187-critical-cross-site-scripting-xss-vulnerability-in-getprojectsidea-create-school-management-system-1-0\/\"  data-wpil-monitor-id=\"73527\">system that handles identity and access management<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2087803246\" 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 an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42959-unauthenticated-replay-attack-exploiting-hmac-reuse\/\"  data-wpil-monitor-id=\"73526\">attacker might exploit<\/a> this vulnerability. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-9408-server-side-request-forgery-attack-in-eclipse-glassfish\/\"  data-wpil-monitor-id=\"77340\">attacker sends an HTTP request<\/a> to the Ceph system with a forged JWT:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/auth\/token HTTP\/1.1\nHost: ceph.example.com\nContent-Type: application\/jwt\n{\n&quot;alg&quot;: &quot;none&quot;,\n&quot;typ&quot;: &quot;JWT&quot;\n}\n{\n&quot;sub&quot;: &quot;admin&quot;,\n&quot;name&quot;: &quot;Admin&quot;,\n&quot;iat&quot;: 1516239022\n}<\/code><\/pre>\n<p>In this example, the attacker is forging a JWT that identifies them as an admin. Because the &#8220;alg&#8221; field is set to &#8220;none&#8221;, the Ceph system does not validate the signature, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54309-critical-vulnerability-in-crushftp-allowing-remote-admin-access\/\"  data-wpil-monitor-id=\"69822\">allowing the attacker to gain admin<\/a> access.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>No known patched <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43588-out-of-bounds-write-vulnerability-in-substance3d-sampler-versions-5-0-and-earlier\/\"  data-wpil-monitor-id=\"73525\">version has been published at the time of writing<\/a>. As a temporary mitigation, organizations can apply a vendor patch or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block malicious JWTs. Organizations should also monitor vendor communications for updates on a patched version.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The vulnerability CVE-2024-48916 is a major concern for any organization using the Ceph storage platform. As a distributed object, block, and file storage platform, Ceph is integral to a wide range of IT systems and cloud networks. This vulnerability affects Ceph versions 19.2.3 and below, specifically in the RadosGW OIDC provider. The vulnerability allows [&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-60309","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\/60309","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=60309"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/60309\/revisions"}],"predecessor-version":[{"id":84403,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/60309\/revisions\/84403"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=60309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=60309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=60309"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=60309"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=60309"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=60309"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=60309"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=60309"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=60309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}