{"id":37035,"date":"2025-05-11T01:08:14","date_gmt":"2025-05-11T01:08:14","guid":{"rendered":""},"modified":"2025-06-24T23:20:59","modified_gmt":"2025-06-25T05:20:59","slug":"cve-2023-38619-integer-overflow-vulnerability-in-gtkwave-s-vzt-facgeometry-parsing-functionality","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-38619-integer-overflow-vulnerability-in-gtkwave-s-vzt-facgeometry-parsing-functionality\/","title":{"rendered":"<strong>CVE-2023-38619: Integer Overflow Vulnerability in GTKWave&#8217;s VZT Facgeometry Parsing Functionality<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability, catalogued as CVE-2023-38619, has been identified in GTKWave 3.3.115, a fully featured GTK+ based wave viewer designed for Unix, Win32, and Mac OSX users. This vulnerability pertains to multiple integer overflow vulnerabilities within the VZT facgeometry parsing functionality of the software. An attacker exploiting this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32444-remote-code-execution-vulnerability-in-vllm-integration-with-mooncake\/\"  data-wpil-monitor-id=\"41866\">vulnerability could potentially execute arbitrary code<\/a> leading to system compromise or data leakage. This vulnerability, therefore, poses a considerable threat to all users of the affected version of GTKWave.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2023-38619<br \/>\nSeverity: High (7.8 CVSS Score)<br \/>\nAttack Vector: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43951-local-file-inclusion-vulnerability-in-labvantage-prior-to-lv-8-8-0-13-hf6\/\"  data-wpil-monitor-id=\"41736\">Local File Inclusion<\/a><br \/>\nPrivileges Required: User level<br \/>\nUser Interaction: Required<br \/>\nImpact: <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=\"42279\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2855455354\" 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 exploit works by leveraging an integer <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35957-heap-based-buffer-overflow-vulnerabilities-in-gtkwave\/\"  data-wpil-monitor-id=\"41800\">overflow vulnerability<\/a> in the VZT facgeometry parsing functionality of GTKWave. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35994-critical-array-index-validation-vulnerabilities-in-gtkwave\/\"  data-wpil-monitor-id=\"41989\">vulnerability lies in the incorrect allocation of the `msb` array<\/a>, which can be triggered by a specially crafted .vzt file. Upon opening this malicious file, the overflow occurs, potentially allowing an attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35996-arbitrary-code-execution-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"42048\">execute arbitrary code<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2972986225\" 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>A conceptual example of the vulnerability might look something like this:<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\ntypedef struct {\nint *msb;\nint size;\n} vzt_file;\nvzt_file *open_vzt_file(char *filename) {\n\/\/ Read file, calculate size, allocate msb array\n\/\/ ... (omitted for brevity)\n\/\/ Vulnerable integer overflow\nvzt_file-&gt;msb = malloc(size * sizeof(int));\n\/\/ ... (omitted for brevity)\n}\nint main(int argc, char **argv) {\nvzt_file *file = open_vzt_file(argv[1]);\n\/\/ ... (omitted for brevity)\n}<\/code><\/pre>\n<p>In this example, the `size` variable is under the control of the attacker and can be set to a large value, causing an integer <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=\"41917\">overflow in the `malloc` call and leading to a buffer<\/a> overflow when the `msb` array is later used. This could potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-35995-gtkwave-array-index-validation-vulnerability-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"42025\">lead to arbitrary code<\/a> execution.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the vendor patch once available. In the meantime, implementing a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure. Regular monitoring of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49199-application-backup-zips-vulnerability-and-system-compromise\/\"  data-wpil-monitor-id=\"61292\">systems and applications<\/a> for unusual activity can also aid in early detection of an attempted exploit.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability, catalogued as CVE-2023-38619, has been identified in GTKWave 3.3.115, a fully featured GTK+ based wave viewer designed for Unix, Win32, and Mac OSX users. This vulnerability pertains to multiple integer overflow vulnerabilities within the VZT facgeometry parsing functionality of the software. An attacker exploiting this vulnerability could potentially execute arbitrary code [&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-37035","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\/37035","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=37035"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37035\/revisions"}],"predecessor-version":[{"id":54967,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37035\/revisions\/54967"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=37035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=37035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=37035"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=37035"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=37035"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=37035"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=37035"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=37035"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=37035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}