{"id":35426,"date":"2025-05-06T10:22:02","date_gmt":"2025-05-06T10:22:02","guid":{"rendered":""},"modified":"2025-10-02T23:37:24","modified_gmt":"2025-10-03T05:37:24","slug":"cve-2023-35989-integer-overflow-vulnerability-in-gtkwave-s-lxt2-zlib-block-allocation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-35989-integer-overflow-vulnerability-in-gtkwave-s-lxt2-zlib-block-allocation\/","title":{"rendered":"<strong>CVE-2023-35989: Integer Overflow Vulnerability in GTKWave&#8217;s LXT2 zlib Block Allocation<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape is constantly evolving, with new vulnerabilities emerging daily. One such vulnerability that has recently come to light is the CVE-2023-35989. This integer <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3786-critical-buffer-overflow-vulnerability-in-tenda-ac15\/\"  data-wpil-monitor-id=\"40291\">overflow vulnerability<\/a> exists in the LXT2 zlib block allocation functionality of GTKWave 3.3.115, a widely-used tool in the electronics industry for viewing VCD files. This vulnerability, if exploited, has the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22636-cross-site-scripting-vulnerability-in-vr-frases-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"40172\">potential to compromise entire systems or lead<\/a> to data leakage. It underscores the need for constant vigilance and proactivity in updating <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-26383-critical-vulnerability-in-amd-tee-puts-system-integrity-and-data-availability-in-jeopardy\/\"  data-wpil-monitor-id=\"88077\">systems and applying patches as they become available<\/a>.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2023-35989<br \/>\nSeverity: High (7.8 CVSS Score)<br \/>\nAttack Vector: File<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3928-unspecified-vulnerability-in-commvault-web-server-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"40369\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-884571773\" 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 lies in the <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=\"41045\">LXT2 zlib block<\/a> allocation functionality of GTKWave 3.3.115. An integer overflow vulnerability exists which, when exploited, can lead to arbitrary <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43946-critical-remote-code-execution-vulnerability-in-tcpwave-ddi\/\"  data-wpil-monitor-id=\"40337\">code execution<\/a>. This is triggered when a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3054-arbitrary-file-upload-vulnerability-in-wp-user-frontend-pro-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"59248\">user opens a specially crafted .lxt2 file<\/a>. The malicious code embedded in the file could potentially grant the attacker unauthorized access to the system, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32953-security-vulnerability-in-z80pack-emulator-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"40420\">leading to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2184386299\" 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 this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47154-exploitation-of-use-after-free-vulnerability-in-libjs-in-ladybird\/\"  data-wpil-monitor-id=\"59249\">vulnerability could be exploited<\/a>. An attacker would create a malicious .lxt2 file and trick the victim into opening it using GTKWave 3.3.115. The malicious <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=\"40360\">code within the file would then execute<\/a>, exploiting the vulnerability. Note that this is just a conceptual example and does not represent actual <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8714-critical-postgresql-vulnerability-allowing-malicious-code-injection-by-superusers\/\"  data-wpil-monitor-id=\"80707\">malicious code<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\"># Constructing a malicious .lxt2 file\n$ echo &quot;malicious_code&quot; &gt; malicious.lxt2\n# The victim opens the malicious file with GTKWave 3.3.115\n$ gtkwave malicious.lxt2<\/code><\/pre>\n<p><strong>Mitigation and Recommendations<\/strong><\/p>\n<p>GTKWave users are strongly encouraged to apply the vendor patch as soon as it becomes available in <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-47039-perl-path-search-order-vulnerability-on-windows-systems\/\"  data-wpil-monitor-id=\"41734\">order to address this vulnerability<\/a>. In addition, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. As always, users should exercise caution when <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-41691-sql-injection-vulnerability-in-os4ed-open-source-information-system-community\/\"  data-wpil-monitor-id=\"64195\">opening files from untrusted sources<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape is constantly evolving, with new vulnerabilities emerging daily. One such vulnerability that has recently come to light is the CVE-2023-35989. This integer overflow vulnerability exists in the LXT2 zlib block allocation functionality of GTKWave 3.3.115, a widely-used tool in the electronics industry for viewing VCD files. This vulnerability, if exploited, has [&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-35426","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\/35426","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=35426"}],"version-history":[{"count":12,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/35426\/revisions"}],"predecessor-version":[{"id":80890,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/35426\/revisions\/80890"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=35426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=35426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=35426"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=35426"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=35426"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=35426"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=35426"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=35426"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=35426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}