{"id":20845,"date":"2025-04-10T14:15:33","date_gmt":"2025-04-10T14:15:33","guid":{"rendered":""},"modified":"2025-05-13T12:20:55","modified_gmt":"2025-05-13T12:20:55","slug":"cve-2023-6740-privilege-escalation-vulnerability-in-jar_signature","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-6740-privilege-escalation-vulnerability-in-jar_signature\/","title":{"rendered":"<strong>CVE-2023-6740: <\/strong>Privilege escalation vulnerability<strong> in <\/strong>jar_signature"},"content":{"rendered":"<p><strong>Introduction<\/strong><\/p>\n<p class=\"\" data-start=\"0\" data-end=\"164\">\u200b<span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">CVE-2023-6740 is a privilege escalation vulnerability identified in the <code data-start=\"72\" data-end=\"87\">jar_signature<\/code> agent plugin of Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">This flaw allows a local user to escalate their privileges, potentially gaining unauthorized access to sensitive system information or administrative control.<\/span> \u200b<span class=\"\" data-state=\"closed\"><span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/www.recordedfuture.com\/vulnerability-database\/CVE-2023-6740?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Checkmk<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+4<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Recorded Future<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+4<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Ubuntu<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+4<\/span><\/span><\/span><\/a><\/span><\/span><\/p>\n<p class=\"\" data-start=\"166\" data-end=\"188\"><strong data-start=\"166\" data-end=\"188\">Technical Details:<\/strong><\/p>\n<p class=\"\" data-start=\"190\" data-end=\"385\"><span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">The <\/code><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-21625-critical-remote-code-execution-vulnerability-in-network-protocol\/\"  data-wpil-monitor-id=\"24249\">vulnerability arises from the <code data-start=\"34\" data-end=\"49\">jar_signature plugin's execution<\/a> of the <code data-start=\"76\" data-end=\"87\">jarsigner<\/code> binary with elevated privileges.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">A malicious local user with <a class=\"wpil_keyword_link\" href=\"https:\/\/www.ameeba.com\"   title=\"access\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"24131\">access<\/a> to the system could replace the <code data-start=\"67\" data-end=\"78\">jarsigner<\/code> binary with a malicious script placed in the <code data-start=\"124\" data-end=\"135\">JAVA_HOME<\/code> directory.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">When the plugin executes this compromised binary, it runs with root privileges, thereby allowing the attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-6735-privilege-escalation-vulnerability-in-checkmks-mk_tsm-agent-plugin\/\"  data-wpil-monitor-id=\"26887\">escalate their privileges<\/a> to root.<\/span> \u200b<span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/checkmk.com\/werk\/16163?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between overflow-hidden\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Checkmk<\/span><\/span><\/span><\/a><\/span><\/p>\n<p class=\"\" data-start=\"387\" data-end=\"409\"><strong data-start=\"387\" data-end=\"409\">Affected Versions:<\/strong><\/p>\n<ul data-start=\"411\" data-end=\"672\">\n<li class=\"\" data-start=\"411\" data-end=\"496\">\n<p class=\"\" data-start=\"413\" data-end=\"496\"><span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">Checkmk versions before 2.2.0p18<\/span>\u200b<span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/www.recordedfuture.com\/vulnerability-database\/CVE-2023-6740?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Tenable\u00ae<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+5<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Recorded Future<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+5<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Ubuntu<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+5<\/span><\/span><\/span><\/a><\/span><\/p>\n<\/li>\n<li class=\"\" data-start=\"497\" data-end=\"584\">\n<p class=\"\" data-start=\"499\" data-end=\"584\"><span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">Checkmk versions before 2.1.0p38<\/span>\u200b<span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/checkmk.com\/werk\/16163?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between overflow-hidden\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Checkmk<\/span><\/span><\/span><\/a><\/span><\/p>\n<\/li>\n<li class=\"\" data-start=\"585\" data-end=\"672\">\n<p class=\"\" data-start=\"587\" data-end=\"672\"><span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">Checkmk versions before 2.0.0p39<\/span>\u200b<span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/www.recordedfuture.com\/vulnerability-database\/CVE-2023-6740?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Tenable\u00ae<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+5<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Recorded Future<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+5<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">NVD<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+5<\/span><\/span><\/span><\/a><\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"\" data-start=\"674\" data-end=\"689\"><strong data-start=\"674\" data-end=\"689\">Mitigation:<\/strong><\/p>\n<p class=\"\" data-start=\"691\" data-end=\"896\"><span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">To <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-50760-addressing-the-critical-buffer-overflow-vulnerability-in-secure-shell-ssh\/\"  data-wpil-monitor-id=\"26888\">address this vulnerability<\/a>, Checkmk has updated the <code data-start=\"55\" data-end=\"70\">jar_signature<\/code> plugin to execute the <code data-start=\"93\" data-end=\"104\">jarsigner<\/code> binary as the <code data-start=\"119\" data-end=\"127\">oracle<\/code> user instead of the root user, preventing the privilege escalation.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\"><a href=\"https:\/\/www.ameeba.com\/blog\/unmasking-the-latest-google-user-scams-a-deep-dive-into-cybersecurity-threats-and-mitigation\/\"  data-wpil-monitor-id=\"42439\">Users are advised to update to the latest<\/a> versions of Checkmk to incorporate this fix.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">If updating is not feasible, disabling the <code data-start=\"43\" data-end=\"58\">jar_signature<\/code> plugin is recommended as a temporary mitigation measure.<\/span> \u200b<span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/checkmk.com\/werk\/16163?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Ubuntu<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+2<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Checkmk<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+2<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Recorded Future<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+2<\/span><\/span><\/span><\/a><\/span><\/p>\n<p class=\"\" data-start=\"898\" data-end=\"911\"><strong data-start=\"898\" data-end=\"911\">Severity:<\/strong><\/p>\n<p class=\"\" data-start=\"913\" data-end=\"1038\"><span class=\"relative -mx-px my-[-0.2rem] rounded-sm px-px py-[0.2rem]\">Checkmk GmbH has <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27007-incorrect-privilege-assignment-vulnerability-in-brainstorm-force-suretriggers\/\"  data-wpil-monitor-id=\"42438\">assigned this vulnerability<\/a> a CVSS score of 8.8 (High), with the following vector: <code data-start=\"100\" data-end=\"146\">CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:C\/C:H\/I:H\/A:H<\/code>.<\/span> \u200b<span class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem]\"><a class=\"flex h-6 overflow-hidden rounded-xl px-2.5 text-[0.5625em] font-medium text-token-text-secondary! bg-[#F4F4F4]! dark:bg-[#303030]!\" href=\"https:\/\/checkmk.com\/werk\/16163?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\"><span class=\"relative bottom-0 left-0 flex h-full w-full items-center\"><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Ubuntu<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+3<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">Checkmk<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+3<\/span><\/span><span class=\"flex h-4 w-full items-center justify-between absolute\"><span class=\"max-w-full grow truncate overflow-hidden text-center\">NVD<\/span><span class=\"ms-1 -me-1 flex h-full items-center rounded-full px-1 text-[#8F8F8F]\">+3<\/span><\/span><\/span><\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction \u200bCVE-2023-6740 is a privilege escalation vulnerability identified in the jar_signature agent plugin of Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39. This flaw allows a local user to escalate their privileges, potentially gaining unauthorized access to sensitive system information or administrative control. \u200bCheckmk+4Recorded Future+4Ubuntu+4 Technical Details: The vulnerability arises from the jar_signature plugin&#8217;s execution [&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,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[88,106],"product":[],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-20845","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","vendor-oracle","attack_vector-privilege-escalation"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Introduction \u200bCVE-2023-6740 is a privilege escalation vulnerability identified in the jar_signature agent plugin of Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39. This flaw allows a local user to escalate their privileges, potentially gaining unauthorized access to sensitive system information or administrative control. \u200bCheckmk+4Recorded Future+4Ubuntu+4 Technical Details: The vulnerability arises from the jar_signature plugin&#039;s execution\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Ameeba\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-6740-privilege-escalation-vulnerability-in-jar_signature\/\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.4\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ameeba Blog - Your Guide to a Safer Digital World.\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"CVE-2023-6740: Privilege escalation vulnerability in jar_signature - Ameeba Blog\" \/>\n\t\t<meta property=\"og:description\" content=\"Introduction \u200bCVE-2023-6740 is a privilege escalation vulnerability identified in the jar_signature agent plugin of Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39. This flaw allows a local user to escalate their privileges, potentially gaining unauthorized access to sensitive system information or administrative control. \u200bCheckmk+4Recorded Future+4Ubuntu+4 Technical Details: The vulnerability arises from the jar_signature plugin&#039;s execution\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/www.ameeba.com\/blog\/cve-2023-6740-privilege-escalation-vulnerability-in-jar_signature\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/02\/image-5.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/02\/image-5.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-04-10T14:15:33+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-05-13T12:20:55+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"CVE-2023-6740: Privilege escalation vulnerability in jar_signature - Ameeba Blog\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Introduction \u200bCVE-2023-6740 is a privilege escalation vulnerability identified in the jar_signature agent plugin of Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39. 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