{"id":64223,"date":"2025-08-21T20:17:06","date_gmt":"2025-08-21T20:17:06","guid":{"rendered":""},"modified":"2025-09-07T11:38:16","modified_gmt":"2025-09-07T17:38:16","slug":"cve-2025-55345-arbitrary-file-overwrite-and-remote-code-execution-vulnerability-in-codex-cli","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55345-arbitrary-file-overwrite-and-remote-code-execution-vulnerability-in-codex-cli\/","title":{"rendered":"<strong>CVE-2025-55345: Arbitrary File Overwrite and Remote Code Execution Vulnerability in Codex CLI<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this blog post, we will discuss the recently identified vulnerability CVE-2025-55345, which affects the Codex CLI when it is operated in workspace-write mode within a malicious context such as a repository or directory. This vulnerability could lead to arbitrary file overwriting and in worst-case scenarios, facilitate remote code execution. Given its severity and potential impact, it is crucial to understand how this vulnerability works, who it affects, and how it can be mitigated.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43275-critical-race-condition-vulnerability-in-macos\/\"  data-wpil-monitor-id=\"71653\">vulnerability is particularly critical<\/a> because it can lead to a system compromise or data leakage, posing substantial risks to any organization that uses Codex CLI. Therefore, it is of utmost importance to be aware of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20217-denial-of-service-vulnerability-in-snort-3-detection-engine-of-cisco-secure-firewall-threat-defense-software\/\"  data-wpil-monitor-id=\"76970\">threat and implement necessary security<\/a> measures to protect your systems.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-55345<br \/>\nSeverity: High (8.8 CVSS Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74806\">Potential system compromise or data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2109388371\" 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>Codex CLI | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55010-arbitrary-php-object-instantiation-in-kanboard-prior-to-version-1-2-47\/\"  data-wpil-monitor-id=\"77884\">versions prior<\/a> to the patched version<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of Codex CLI&#8217;s workspace-write mode, specifically when it is operated within a malicious context. An attacker can craft a malicious symlink that, when followed by the Codex CLI, leads <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24119-critical-macos-vulnerability-allowing-arbitrary-code-execution-outside-sandbox\/\"  data-wpil-monitor-id=\"90931\">outside the allowed<\/a> current working directory. As a result, an attacker can overwrite arbitrary files and, in some cases, execute remote code, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49691-heap-based-buffer-overflow-in-windows-media-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"72191\">leading to a potential system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3179971062\" 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 this vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\"># Attacker crafts malicious symlink\nln -s \/target\/directory \/workspace\/allowed\/directory\n# Codex CLI follows the symlink outside of its allowed directory\ncodex workspace-write \/workspace\/allowed\/directory\n# Arbitrary file is overwritten or remote code is executed\necho &quot;malicious code&quot; &gt; \/target\/directory\/overwritten_file<\/code><\/pre>\n<p>In this example, the attacker creates a symlink that points to a target directory outside of the allowed directory for Codex CLI. When the CLI attempts to write to the workspace, it inadvertently follows the symlink and writes to the target directory, enabling the attacker to overwrite <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30327-integer-overflow-vulnerability-in-incopy-leading-to-potential-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"73559\">arbitrary files or execute malicious code<\/a>.<\/p>\n<p><strong>Recommended Mitigation Steps<\/strong><\/p>\n<p>To mitigate this vulnerability, users are strongly recommended to apply the vendor-provided patch as soon as it becomes available. In the meantime, deploying a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary solution to detect and prevent <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-7457-macos-authorization-model-exploit-leading-to-potential-mitm-attacks\/\"  data-wpil-monitor-id=\"79986\">potential exploits<\/a>.<br \/>\nKeeping your systems updated and regularly monitoring for any unusual activities can also help prevent the exploitation of this vulnerability. Stay safe and secure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this blog post, we will discuss the recently identified vulnerability CVE-2025-55345, which affects the Codex CLI when it is operated in workspace-write mode within a malicious context such as a repository or directory. This vulnerability could lead to arbitrary file overwriting and in worst-case scenarios, facilitate remote code execution. Given its severity and [&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":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64223","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64223","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=64223"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64223\/revisions"}],"predecessor-version":[{"id":83889,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64223\/revisions\/83889"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64223"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64223"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64223"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64223"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64223"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64223"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}