CVE-2023-39274: Integer Overflow Vulnerabilities in GTKWave 3.3.115 Facgeometry Parsing

Overview

The Common Vulnerabilities and Exposures (CVE) system has recently identified a significant issue in the LXT2 facgeometry parsing functionality of GTKWave 3.3.115, tagged as CVE-2023-39274. This vulnerability primarily affects developers and users of GTKWave, an open-source waveform viewer that can view VCD and LXT formats. It’s crucial due to its potential to allow an attacker to execute arbitrary code, leading to a system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2023-39274
Severity: High (7.8)
Attack Vector: Local
Privileges Required: User level
User Interaction: Required
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

GTKWave | 3.3.115

How the Exploit Works

The exploit occurs within the LXT2 facgeometry parsing functionality of GTKWave. An attacker can craft a malicious .lxt2 file that triggers an integer overflow when allocating the `len` array. If a victim opens this malicious file, the overflow allows the attacker to execute arbitrary code. This arbitrary code execution can lead to system compromise and potential data leakage, escalating the severity and impact of this vulnerability.

Conceptual Example Code

A conceptual example of exploiting this vulnerability might involve creating a malformed .lxt2 file with a specific sequence that triggers the integer overflow. Due to the sensitive nature of this issue, specific exploit code will not be provided. However, a conceptual example of the process is as follows:

# Generate a malformed .lxt2 file with a specific sequence
# that triggers the integer overflow.
echo 'malformed_sequence' > malicious.lxt2
# Send the malicious .lxt2 file to the victim.
scp malicious.lxt2 victim@target:/path/to/target
# If the victim opens the malicious.lxt2 file using GTKWave,
# the exploit triggers, potentially leading to arbitrary code
# execution and system compromise.

Remember, this is a conceptual example and should not be used for harmful purposes.

Mitigation

Users of GTKWave 3.3.115 are recommended to apply the vendor patch as soon as it is available. In the meantime, using Web Application Firewalls (WAFs) or Intrusion Detection Systems (IDS) can serve as a temporary mitigation measure. These systems can help identify and block attempts to exploit this vulnerability, thus providing an extra layer of protection.