CVE-2023-54330
📋 TL;DR
This CVE describes a critical remote stack-based buffer overflow vulnerability in Inbit Messenger versions 4.6.0 to 4.9.0. Unauthenticated attackers can send specially crafted network packets to execute arbitrary code on vulnerable Windows systems. Organizations running affected versions of Inbit Messenger are at risk of complete system compromise.
💻 Affected Systems
- Inbit Messenger
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, data exfiltration, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to malware installation, backdoor persistence, and credential theft from the compromised system.
If Mitigated
Attack blocked at network perimeter with no internal systems exposed; minimal impact if proper segmentation exists.
🎯 Exploit Status
Exploit code is publicly available and requires no authentication; attackers can easily weaponize this vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check current Inbit Messenger version. 2. If version is between 4.6.0 and 4.9.0, immediately uninstall the software. 3. Consider alternative messaging solutions as vendor patch status is unknown.
🔧 Temporary Workarounds
Network Segmentation
allBlock all inbound network traffic to Inbit Messenger ports at firewall/network perimeter
Application Whitelisting
windowsImplement application control to prevent execution of unauthorized code
🧯 If You Can't Patch
- Immediately isolate affected systems from network access
- Deploy endpoint detection and response (EDR) solutions with behavioral monitoring
🔍 How to Verify
Check if Vulnerable:
Check Inbit Messenger version in Help > About menu; if version is 4.6.0, 4.7.0, 4.8.0, or 4.9.0, system is vulnerable.Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify Inbit Messenger is completely uninstalled or upgraded to version above 4.9.0 (if available).📡 Detection & Monitoring
Log Indicators:
- Unusual network connections to Inbit Messenger ports
- Process creation anomalies from messenger.exe
- SEH overwrite exceptions in Windows event logs
Network Indicators:
- Malformed packets to Inbit Messenger default ports
- Unusual payload patterns in network traffic to messenger service
SIEM Query:
source="windows" AND (event_id=4625 OR event_id=4688) AND process_name="messenger.exe" AND (command_line CONTAINS "-malicious" OR parent_process CONTAINS "suspicious")🔗 References
- https://github.com/a-rey/exploits/blob/main/writeups/Inbit_Messenger/v4.6.0/writeup.md
- https://web.archive.org/web/20200122082432/https://www.softsea.com/review/Inbit-Messenger-Basic-Edition.html
- https://www.exploit-db.com/exploits/51126
- https://www.vulncheck.com/advisories/inbit-messenger-unauthenticated-remote-seh-overflow
- https://github.com/a-rey/exploits/blob/main/writeups/Inbit_Messenger/v4.6.0/writeup.md
