CVE-2021-41506 Explained : Impact and Mitigation
Learn about CVE-2021-41506 affecting Xiaongmai AHB series IP cameras with a backdoor in macGuarder and dvrHelper binaries, allowing unauthorized access. Find mitigation steps and firmware update recommendations.
Xiaongmai AHB7008T-MH-V2, AHB7804R-ELS, AHB7804R-MH-V2, AHB7808R-MS-V2, AHB7808R-MS, AHB7808T-MS-V2, AHB7804R-LMS, HI3518_50H10L_S39 V4.02.R11.7601.Nat.Onvif.20170420, V4.02.R11.Nat.Onvif.20160422, V4.02.R11.7601.Nat.Onvif.20170424, V4.02.R11.Nat.Onvif.20170327, V4.02.R11.Nat.Onvif.20161205, V4.02.R11.Nat.20170301, V4.02.R12.Nat.OnvifS.20170727 is affected by a backdoor in the macGuarder and dvrHelper binaries of DVR/NVR/IP camera firmware due to static root account credentials in the system.
Understanding CVE-2021-41506
This CVE involves a backdoor issue in Xiaongmai IP camera firmware.
What is CVE-2021-41506?
The vulnerability in Xiaongmai AHB series IP cameras could allow unauthorized access due to hardcoded root account credentials in the firmware.
The Impact of CVE-2021-41506
The backdoor could be exploited by attackers to gain unauthorized access to affected IP cameras, compromising security and privacy.
Technical Details of CVE-2021-41506
This section provides in-depth technical information about the vulnerability.
Vulnerability Description
The backdoor exists in the macGuarder and dvrHelper binaries of the affected DVR, NVR, and IP camera firmware.
Affected Systems and Versions
- Xiaongmai AHB7008T-MH-V2
- AHB7804R-ELS
- AHB7804R-MH-V2
- AHB7808R-MS-V2
- AHB7808R-MS
- AHB7808T-MS-V2
- AHB7804R-LMS
- HI3518_50H10L_S39 V4.02.R11.7601.Nat.Onvif.20170420
- V4.02.R11.Nat.Onvif.20160422
- V4.02.R11.7601.Nat.Onvif.20170424
- V4.02.R11.Nat.Onvif.20170327
- V4.02.R11.Nat.Onvif.20161205
- V4.02.R11.Nat.20170301
- V4.02.R12.Nat.OnvifS.20170727
Exploitation Mechanism
The vulnerability is exploited by leveraging the hardcoded root account credentials present in the system.
Mitigation and Prevention
To address this issue, consider the following steps:
Immediate Steps to Take
- Disable Telnet services on the affected devices.
- Monitor network traffic for any unusual activity.
- Implement strong, unique passwords for all accounts.
Long-Term Security Practices
- Regularly update firmware to patched versions.
- Conduct security audits to identify vulnerabilities.
- Implement network segmentation to isolate critical devices.
Patching and Updates
Ensure timely installation of firmware updates provided by Xiaongmai to fix the backdoor vulnerability.