{"id":36336,"date":"2025-05-08T13:44:39","date_gmt":"2025-05-08T13:44:39","guid":{"rendered":""},"modified":"2025-09-08T17:18:57","modified_gmt":"2025-09-08T23:18:57","slug":"cve-2023-37420-critical-out-of-bounds-write-vulnerability-in-gtkwave-s-vcd-parse-valuechange-portdump-functionality","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-37420-critical-out-of-bounds-write-vulnerability-in-gtkwave-s-vcd-parse-valuechange-portdump-functionality\/","title":{"rendered":"CVE-2023-37420: Critical Out-of-Bounds Write Vulnerability in GTKWave’s VCD Parse_ValueChange Portdump Functionality<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The cybersecurity landscape is riddled with vulnerabilities that can wreak havoc on systems, compromise data, and disrupt operations. One such critical vulnerability has recently come to light, affecting the GTKWave software, specifically version 3.3.115. GTKWave is widely utilized for viewing waveform data produced by digital logic simulators, and the vulnerability identified has the potential<\/a> to impact a broad range of users.
\nThe CVE-2023-37420 vulnerability is of particular concern as it allows for arbitrary code execution<\/a>, providing an attacker with the potential to compromise a system, steal sensitive data, or disrupt operations. The implications of this vulnerability are vast, affecting individual users, organizations, and potentially even critical infrastructure that relies on GTKWave<\/a>.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2023-37420
\nSeverity: High (7.8 CVSS score)
\nAttack Vector: Local File<\/a>
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: Potential system compromise and data leakage<\/a><\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

GTKWave | 3.3.115<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability stems from multiple out-of-bounds write vulnerabilities that exist within the VCD parse_valuechange portdump<\/a> functionality of GTKWave. The vulnerability can be triggered by a specially crafted .vcd file which, when opened, can potentially lead to arbitrary code execution<\/a>. This exploit is specifically triggered via<\/a> the vcd2lxt conversion utility.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

While the exact nature of the exploit code is withheld to prevent misuse, the general concept involves crafting a .vcd file with specific malicious payloads that trigger the out-of-bounds write when the file is opened in GTKWave<\/a>. The example below is a simplified representation and does not represent actual malicious code<\/a>:<\/p>\n

#Conceptual example of a malicious .vcd file\nheader = \"...\"\nmalicious_payload = \"...\" #Out-of-bounds write triggering payload\nfooter = \"...\"\nwith open(\"malicious.vcd\", \"w\") as f:\nf.write(header + malicious_payload + footer)<\/code><\/pre>\n
This file, when opened in a vulnerable version of GTKWave<\/a>, would trigger the vulnerability, potentially leading to arbitrary code execution.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
To mitigate the potential exploitation of this vulnerability<\/a>, users are advised to apply the vendor-supplied patch as soon as it becomes available. In the interim, the use of Web Application Firewalls (WAF) and Intrusion Detection Systems (IDS) can serve as a temporary mitigation measure by identifying and blocking attempts to exploit this vulnerability<\/a>. It’s also recommended to avoid opening .vcd files from untrusted sources<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity landscape is riddled with vulnerabilities that can wreak havoc on systems, compromise data, and disrupt operations. One such critical vulnerability has recently come to light, affecting the GTKWave software, specifically version 3.3.115. GTKWave is widely utilized for viewing waveform data produced by digital logic simulators, and the vulnerability identified has the potential […]<\/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,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-36336","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t