CVE-2023-35703: Stack-Based Buffer Overflow Vulnerability in GTKWave 3.3.115

Overview

In the ever-evolving landscape of cyber threats, a new vulnerability has been discovered in GTKWave 3.3.115, a software used for viewing waveform data. Designated as CVE-2023-35703, this vulnerability, if exploited, can lead to arbitrary code execution, potentially compromising systems and leading to data leakage. This vulnerability specifically affects the FST LEB128 varint functionality of GTKWave. As such, any organization or individual using affected versions of this software could be at risk, making it crucial to understand and address this threat.

Vulnerability Summary

CVE ID: CVE-2023-35703
Severity: High (7.8)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: Arbitrary code execution, potential system compromise, and data leakage

Affected Products

Product | Affected Versions

GTKWave | 3.3.115

How the Exploit Works

The vulnerability lies in the FST LEB128 varint functionality of the GTKWave 3.3.115. Specifically, the vulnerability arises from multiple stack-based buffer overflow vulnerabilities within the fstReaderVarint64 function. To exploit this vulnerability, an attacker would need to craft a malicious .fst file, which, when opened by a victim, could allow the attacker to execute arbitrary code. This could potentially compromise the victim’s system and lead to data leakage.

Conceptual Example Code

Given the nature of this vulnerability, a potential exploit could look something like this:

#include <stdio.h>
#include <string.h>
void vulnerable_function(char *str) {
char buffer[10];
strcpy(buffer, str);
}
int main(int argc, char **argv) {
vulnerable_function(argv[1]);
return 0;
}

In this hypothetical scenario, a buffer overflow occurs when the `vulnerable_function` copies the input string to the `buffer` without checking its size. If the input string is larger than the `buffer`, it would overwrite the adjacent memory, causing a buffer overflow and paving the way for arbitrary code execution.

Mitigation Guidance

Users are advised to apply the vendor patch as soon as possible to mitigate the vulnerability. In the interim, users can use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation. Regularly updating and monitoring systems for any unusual activities can also prevent potential exploitation.