{"id":35605,"date":"2025-05-06T12:22:57","date_gmt":"2025-05-06T12:22:57","guid":{"rendered":""},"modified":"2025-06-18T05:19:49","modified_gmt":"2025-06-18T11:19:49","slug":"cve-2023-35995-gtkwave-array-index-validation-vulnerability-leading-to-arbitrary-code-execution","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-35995-gtkwave-array-index-validation-vulnerability-leading-to-arbitrary-code-execution\/","title":{"rendered":"<strong>CVE-2023-35995: GTKWave Array Index Validation Vulnerability Leading to Arbitrary Code Execution<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity world is yet again faced with a significant vulnerability, CVE-2023-35995, which is threatening to compromise the integrity of systems globally. This vulnerability affects the GTKWave 3.3.115, an open-source waveform viewer which is extensively used across various industries for debugging and verification of digital circuits. The cause of concern is the possibility of arbitrary <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43946-critical-remote-code-execution-vulnerability-in-tcpwave-ddi\/\"  data-wpil-monitor-id=\"40336\">code execution<\/a>, which can lead to a system compromise or data leakage. This underscores the importance of understanding and mitigating this vulnerability as it can be exploited by malicious actors to gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-25777-unauthorized-user-profile-access-in-codeastro-bus-ticket-booking-system\/\"  data-wpil-monitor-id=\"41360\">unauthorized access<\/a> to sensitive data.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2023-35995<br \/>\nSeverity: High (7.8 CVSS Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3914-potential-arbitrary-file-uploads-and-system-compromise-in-aeropage-sync-for-airtable-wordpress-plugin\/\"  data-wpil-monitor-id=\"40579\">System compromise<\/a>, potential data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3374626366\" 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>GTKWave | 3.3.115<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability stems from multiple improper <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34436-critical-out-of-bounds-write-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"41038\">array index validations<\/a> in the fstReaderIterBlocks2 tdelta functionality of GTKWave 3.3.115. A malicious actor can exploit this by creating a specially crafted .fst file, leading to arbitrary <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-13808-remote-code-execution-vulnerability-in-xpro-elementor-addons-pro-wordpress-plugin\/\"  data-wpil-monitor-id=\"40357\">code execution<\/a>. A victim would need to open this malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2101-local-file-inclusion-vulnerability-in-edumall-wordpress-theme\/\"  data-wpil-monitor-id=\"40702\">file to trigger the vulnerability<\/a>. More specifically, this vulnerability concerns the tdelta indexing when signal_lens is 1, which is not adequately validated, opening up a potential gateway for arbitrary <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32432-remote-code-execution-vulnerability-in-craft-cms\/\"  data-wpil-monitor-id=\"40499\">code execution<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2281910708\" 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 the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47154-exploitation-of-use-after-free-vulnerability-in-libjs-in-ladybird\/\"  data-wpil-monitor-id=\"59585\">vulnerability might be exploited<\/a>. This pseudocode represents the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24189-memory-corruption-vulnerability-due-to-maliciously-crafted-web-content-in-various-operating-systems\/\"  data-wpil-monitor-id=\"59584\">crafting of a malicious<\/a> .fst file:<\/p>\n<pre><code class=\"\" data-line=\"\">def create_malicious_fst():\n# Initialize malicious fst file\nfst_file = FstFile(&quot;malicious.fst&quot;)\n# Set signal_lens to 1 to exploit vulnerability\nfst_file.set_signal_lens(1)\n# Insert malicious code that will be executed upon opening the file\nfst_file.insert_code(&quot;malicious_code&quot;)\n# Save the fst file\nfst_file.save()<\/code><\/pre>\n<p>The above pseudocode outlines the potential steps a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24274-input-validation-issue-exploitable-via-malicious-app-on-macos\/\"  data-wpil-monitor-id=\"59583\">malicious actor could take to exploit<\/a> the vulnerability. They craft a malicious .fst file and set signal_lens to 1, exploiting 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=\"41531\">improper array index<\/a> validation. They then insert malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20229-remote-code-execution-vulnerability-in-splunk-enterprise-and-cloud-platforms\/\"  data-wpil-monitor-id=\"40687\">code that would be executed<\/a> when the target opens the file.<\/p>\n<p><strong>How to Mitigate<\/strong><\/p>\n<p>The best mitigation strategy currently available is to apply the vendor patch. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure. However, it is highly recommended to apply the vendor patch as soon as possible to ensure the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32953-security-vulnerability-in-z80pack-emulator-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"40417\">security of your systems<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity world is yet again faced with a significant vulnerability, CVE-2023-35995, which is threatening to compromise the integrity of systems globally. This vulnerability affects the GTKWave 3.3.115, an open-source waveform viewer which is extensively used across various industries for debugging and verification of digital circuits. The cause of concern is the possibility of [&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-35605","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\/35605","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=35605"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/35605\/revisions"}],"predecessor-version":[{"id":53271,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/35605\/revisions\/53271"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=35605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=35605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=35605"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=35605"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=35605"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=35605"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=35605"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=35605"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=35605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}