CVE-2023-41612
📋 TL;DR
The Victure PC420 camera firmware version 1.1.39 uses a weak, hardcoded encryption key for the enabled_telnet.dat file on its Micro SD card. This allows attackers with physical or remote access to the SD card to decrypt the file, enable telnet access, and gain unauthorized control of the device. All users of Victure PC420 cameras with firmware 1.1.39 are affected.
💻 Affected Systems
- Victure PC420 IP Camera
📦 What is this software?
Pc420 Firmware by Govicture
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to enable telnet, gain root access, install malware, pivot to internal networks, and use the camera for surveillance or botnet participation.
Likely Case
Attackers with physical access to the SD card or remote access via other vulnerabilities can enable telnet and gain administrative control of the camera.
If Mitigated
Limited impact if SD card is encrypted with strong keys, telnet is disabled by default, and network segmentation prevents lateral movement.
🎯 Exploit Status
Exploitation requires access to the Micro SD card (physical or via other vulnerabilities) to decrypt the enabled_telnet.dat file using the weak key. The decryption method is publicly documented in the reference article.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Check Victure website for firmware updates. If update exists: 1. Download latest firmware from official source. 2. Upload to camera via web interface. 3. Reboot camera.
🔧 Temporary Workarounds
Disable SD Card Functionality
allRemove or disable the Micro SD card to prevent file access.
Physically remove the Micro SD card from the camera
Network Segmentation
allIsolate camera on separate VLAN with strict firewall rules.
Configure network switch to place camera on isolated VLAN
Add firewall rules to block all unnecessary inbound/outbound traffic
🧯 If You Can't Patch
- Physically secure the camera and SD card to prevent unauthorized access
- Disable telnet service completely if possible through configuration
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface. If version is 1.1.39, extract enabled_telnet.dat from SD card and attempt decryption with known weak key.Check Version:
Check camera web interface at Settings > System > Firmware VersionVerify Fix Applied:
Verify firmware version is updated beyond 1.1.39. Test that enabled_telnet.dat uses strong encryption or is properly secured.📡 Detection & Monitoring
Log Indicators:
- Unexpected telnet service activation
- Failed login attempts to telnet
- SD card access anomalies
Network Indicators:
- Telnet traffic (port 23) from camera
- Unusual outbound connections from camera
SIEM Query:
source="camera" AND (event="telnet_enabled" OR port=23)