CVE-2023-34087: Code Execution Vulnerability in GTKWave 3.3.115 Through Improper Array Index Validation

Overview

A new cybersecurity threat has emerged, labeled as CVE-2023-34087. This vulnerability exists in the EVCD var len parsing functionality of GTKWave 3.3.115, a renowned open-source waveform viewer. The flaw is due to an improper array index validation, which can potentially lead to arbitrary code execution. This means that an attacker could run any command of their choice on the victim’s system, which could lead to system compromise or data leakage. The impact of such a vulnerability is far-reaching and affects anyone using the affected version of GTKWave.

Vulnerability Summary

CVE ID: CVE-2023-34087
Severity: High (7.8 CVSS score)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

GTKWave | 3.3.115

How the Exploit Works

This exploit works by taking advantage of an improper array index validation within the EVCD var len parsing functionality of GTKWave 3.3.115. By crafting a malicious .evcd file, an attacker may lead the system to execute arbitrary code. The victim’s system would execute this code upon opening the malicious file.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited. This is abstract and not actual code, but it serves to illustrate the potential danger:

# Creating a malicious .evcd file
echo "EVCD data with improper array index" > exploit.evcd
# The malicious file is then sent to the victim, who unknowingly opens it with GTKWave
victim$ gtkwave exploit.evcd

In this example, “EVCD data with improper array index” represents the malicious payload that triggers the vulnerability. Upon opening the file in GTKWave, the payload is executed, leading to arbitrary code execution.
As a cybersecurity professional, it is crucial to keep up-to-date with the latest vulnerabilities and threats. By understanding the nature of the vulnerability, how it’s exploited, and its potential impact, we can take the necessary steps to mitigate these threats and secure our systems and data.