CVE-2023-35961

What it actually does

The flaw permits arbitrary operating system command execution via unsanitized input during decompression in the vcd_recorder_main function when a specially crafted wave file is processed.

Why it matters to the business

Compromise of user workstations or analysis systems can occur when untrusted files are opened, enabling data exfiltration, persistence, or lateral movement with potential disruption to engineering workflows.

How an attack unfolds

An attacker prepares a wave file containing malicious payloads targeting the decompression logic; the file is delivered via email, download, or shared storage; the victim opens it with the vulnerable application, triggering command injection and arbitrary code execution.

How to fix it

Upgrade to the latest GTKWave release containing fixes for the decompression routines; until then, restrict opening of wave files from untrusted sources and consider running the application under restricted user contexts.

How to confirm the fix worked

Confirm application version against vendor releases, review release notes for decompression fixes, and test sample files in an isolated environment to verify command execution is prevented.

Typical attack path

1. Create malicious wave file exploiting vcd_recorder_main decompression
2. Deliver file to target via email, web, or removable media
3. Victim opens file in affected application
4. Injected commands execute with user privileges

How to detect it

Review process creation and command-line logs for GTKWave spawning unexpected shell or system utilities; inspect recent wave file access timestamps and origins in user activity logs.

What your security team should do

• Block or sandbox opening of untrusted wave files in GTKWave
• Monitor vendor site for patch availability and deploy immediately
• Implement application allow-listing or least-privilege execution policies
• Add file-type and process creation monitoring around GTKWave usage