{"id":37037,"date":"2025-05-11T03:08:52","date_gmt":"2025-05-11T03:08:52","guid":{"rendered":""},"modified":"2025-05-30T13:06:30","modified_gmt":"2025-05-30T19:06:30","slug":"cve-2023-38621-integer-overflow-vulnerabilities-in-gtkwave-s-vzt-facgeometry-parsing-functionality","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-38621-integer-overflow-vulnerabilities-in-gtkwave-s-vzt-facgeometry-parsing-functionality\/","title":{"rendered":"<strong>CVE-2023-38621: Integer Overflow Vulnerabilities in GTKWave&#8217;s VZT Facgeometry Parsing Functionality<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The CVE-2023-38621 vulnerability exposes a critical flaw in the VZT facgeometry parsing functionality of GTKWave 3.3.115. This vulnerability, reflected in its high CVSS Severity Score of 7.8, affects a broad range of systems and applications that leverage GTKWave for viewing waveform data from hardware simulations. The key concern is the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32974-critical-vulnerability-in-xwiki-s-rights-analysis-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"42278\">potential for system<\/a> compromise or data leakage, which can result in substantial damage to an organization&#8217;s data security and integrity.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2023-38621<br \/>\nSeverity: High (7.8 CVSS Severity Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: Arbitrary <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32444-remote-code-execution-vulnerability-in-vllm-integration-with-mooncake\/\"  data-wpil-monitor-id=\"41874\">code execution<\/a> leading to potential system compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3727119188\" 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: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\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: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\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: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/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 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35957-heap-based-buffer-overflow-vulnerabilities-in-gtkwave\/\"  data-wpil-monitor-id=\"41802\">vulnerability arises from multiple integer overflow<\/a> points found in the VZT facgeometry parsing functionality of GTKWave. By crafting a malicious .vzt file, an attacker can cause an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35989-integer-overflow-vulnerability-in-gtkwave-s-lxt2-zlib-block-allocation\/\"  data-wpil-monitor-id=\"41926\">integer overflow<\/a> when allocating the `flags` array. The overflow can lead to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35969-critical-heap-based-buffer-overflow-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"41916\">buffer<\/a> overflow, thereby paving the way for arbitrary code execution.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2187120325\" 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 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=\"42363\">vulnerability might be exploited<\/a>. This example does not represent a real exploit but serves to illustrate the process.<br \/>\nFirstly, the attacker creates a malicious .vzt file designed to trigger an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-36864-integer-overflow-vulnerability-in-gtkwave-3-3-115-with-potential-for-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"42466\">integer overflow<\/a> when the `flags` array is being allocated.<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;stdio.h&gt;\n#include &lt;string.h&gt;\nint main() {\nchar buffer[5];\nstrcpy(buffer, &quot;A string that&#039;s way too long for the buffer&quot;);\nreturn 0;\n}<\/code><\/pre>\n<p>The attacker then tricks the victim into opening the malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-38622-integer-overflow-vulnerabilities-in-gtkwave-vzt-facgeometry-parsing-functionality\/\"  data-wpil-monitor-id=\"43246\">.vzt file using GTKWave<\/a>. This, in turn, triggers the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2907-critical-vulnerability-in-order-delivery-date-wordpress-plugin-could-allow-full-site-takeover\/\"  data-wpil-monitor-id=\"41824\">vulnerability and allows<\/a> the attacker to execute arbitrary code.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The recommended mitigation strategy is to apply the patch provided by the vendor. If that is not possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. However, these do not eliminate the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31637-high-risk-sql-injection-vulnerability-in-lambertgroup-shout\/\"  data-wpil-monitor-id=\"51872\">vulnerabilities but merely reduce the risk<\/a> of exploitation. To ensure complete protection, it is crucial to update the affected software to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2775-unauthenticated-xxe-vulnerability-in-sysaid-on-prem-versions-leading-to-administrator-account-takeover\/\"  data-wpil-monitor-id=\"43834\">version where the vulnerability<\/a> has been rectified.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The CVE-2023-38621 vulnerability exposes a critical flaw in the VZT facgeometry parsing functionality of GTKWave 3.3.115. This vulnerability, reflected in its high CVSS Severity Score of 7.8, affects a broad range of systems and applications that leverage GTKWave for viewing waveform data from hardware simulations. The key concern is the potential for system compromise [&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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-37037","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37037","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=37037"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37037\/revisions"}],"predecessor-version":[{"id":46423,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37037\/revisions\/46423"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=37037"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=37037"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=37037"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=37037"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=37037"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=37037"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=37037"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=37037"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=37037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}