{"id":37032,"date":"2025-05-11T00:07:50","date_gmt":"2025-05-11T00:07:50","guid":{"rendered":""},"modified":"2025-05-30T13:06:31","modified_gmt":"2025-05-30T19:06:31","slug":"cve-2023-38618-integer-overflow-vulnerabilities-in-gtkwave-s-vzt-facgeometry-parsing-functionality","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-38618-integer-overflow-vulnerabilities-in-gtkwave-s-vzt-facgeometry-parsing-functionality\/","title":{"rendered":"<strong>CVE-2023-38618: Integer Overflow Vulnerabilities in GTKWave&#8217;s VZT Facgeometry Parsing Functionality<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>This blog post aims to thoroughly investigate CVE-2023-38618, a critical vulnerability that affects the VZT facgeometry parsing functionality of GTKWave 3.3.115. This vulnerability is particularly significant due to its potential to execute arbitrary code, which would enable a threat actor to compromise systems or leak data. Victims could inadvertently trigger this <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=\"41737\">vulnerability by merely opening a malicious .vzt file<\/a>. Given the widespread use of GTKWave in analyzing digital logic simulations, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31637-high-risk-sql-injection-vulnerability-in-lambertgroup-shout\/\"  data-wpil-monitor-id=\"51873\">vulnerability poses a serious risk<\/a> to a large number of users.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2023-38618<br \/>\nSeverity: High (7.8\/10)<br \/>\nAttack Vector: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2158-local-file-inclusion-vulnerability-in-wordpress-review-plugin\/\"  data-wpil-monitor-id=\"45563\">Local File<\/a><br \/>\nPrivileges Required: None<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=\"42280\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1083959461\" 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 takes advantage of integer <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3988-critical-buffer-overflow-vulnerability-in-totolink-n150rt\/\"  data-wpil-monitor-id=\"41724\">overflow vulnerabilities<\/a> found in the VZT facgeometry parsing functionality of GTKWave. An attacker can <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=\"51874\">craft a malicious<\/a> .vzt file that, when opened by the victim, triggers the vulnerability. Specifically, the vulnerability is exploited during the allocation of the `rows` array, where 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=\"41927\">integer overflow<\/a> can occur. This can allow an attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32444-remote-code-execution-vulnerability-in-vllm-integration-with-mooncake\/\"  data-wpil-monitor-id=\"41875\">execute arbitrary code<\/a>, potentially resulting in a system compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-8760517\" 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>Given the nature of this vulnerability, a conceptual example might look something like this:<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\nint main() {\nunsigned int rows = 0xFFFFFFFF;  \/\/ maliciously large number of rows\nunsigned int cols = 5;\n\/\/ allocate memory for rows array, triggering integer overflow\nint* array = (int*) malloc(rows * cols * sizeof(int));\n\/\/ rest of the .vzt file processing code...\n}<\/code><\/pre>\n<p>In this example, the maliciously large number of rows causes 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=\"42467\">integer overflow<\/a> during the memory allocation for the `rows` array. This could potentially lead to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-7208-critical-buffer-overflow-vulnerability-in-totolink-x2000r-v2-2-0-0-b20230727-10434\/\"  data-wpil-monitor-id=\"41725\">buffer overflow<\/a>, causing undefined behavior and potentially allowing an attacker to execute arbitrary code.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview This blog post aims to thoroughly investigate CVE-2023-38618, a critical vulnerability that affects the VZT facgeometry parsing functionality of GTKWave 3.3.115. This vulnerability is particularly significant due to its potential to execute arbitrary code, which would enable a threat actor to compromise systems or leak data. Victims could inadvertently trigger this vulnerability by merely [&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],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-37032","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37032","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=37032"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37032\/revisions"}],"predecessor-version":[{"id":46424,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37032\/revisions\/46424"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=37032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=37032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=37032"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=37032"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=37032"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=37032"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=37032"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=37032"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=37032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}