CVE-2017-7927 in DH-IPC-Hxxxxxxxxx
Summary
by MITRE
A Use of Password Hash Instead of Password for Authentication issue was discovered in Dahua DH-IPC-HDBW23A0RN-ZS, DH-IPC-HDBW13A0SN, DH-IPC-HDW1XXX, DH-IPC-HDW2XXX, DH-IPC-HDW4XXX, DH-IPC-HFW1XXX, DH-IPC-HFW2XXX, DH-IPC-HFW4XXX, DH-SD6CXX, DH-NVR1XXX, DH-HCVR4XXX, DH-HCVR5XXX, DHI-HCVR51A04HE-S3, DHI-HCVR51A08HE-S3, and DHI-HCVR58A32S-S2 devices. The use of password hash instead of password for authentication vulnerability was identified, which could allow a malicious user to bypass authentication without obtaining the actual password.
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Analysis
by VulDB Data Team • 12/22/2020
The vulnerability identified in CVE-2017-7927 represents a critical authentication flaw affecting multiple Dahua security devices including IP cameras, NVR systems, and DVR equipment. This issue stems from the improper implementation of authentication mechanisms where the system accepts password hashes instead of actual passwords for verification purposes. The flaw exists across a broad range of Dahua products including the DH-IPC-HDBW23A0RN-ZS, DH-IPC-HDBW13A0SN, and various other camera and recorder models within the DH-IPC, DH-SD6CXX, DH-NVR1XXX, DH-HCVR4XXX, DH-HCVR5XXX, DHI-HCVR51A04HE-S3, DHI-HCVR51A08HE-S3, and DHI-HCVR58A32S-S2 series. The vulnerability allows attackers to bypass authentication mechanisms without needing to obtain or crack actual passwords, creating a significant security risk for networked surveillance systems.
The technical nature of this vulnerability can be categorized under CWE-256, which specifically addresses the issue of storing or using password hashes in place of actual passwords for authentication purposes. This flaw creates an authentication bypass condition where an attacker can exploit the system's improper handling of credential verification. The implementation error occurs at the authentication layer where the system does not properly validate that the submitted credentials match the expected password format. Instead, the system accepts hash values as valid authentication tokens, effectively rendering the password protection mechanism ineffective. This particular implementation flaw allows for unauthorized access to surveillance systems, potentially enabling attackers to view live feeds, access recorded footage, modify system settings, or even gain control over the entire networked security infrastructure.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it fundamentally undermines the security posture of deployed surveillance networks. Attackers exploiting this vulnerability can gain persistent access to critical security infrastructure without requiring legitimate credentials, making detection particularly challenging. The affected devices typically serve as the primary means of monitoring and securing physical locations, making their compromise a serious concern for organizations relying on these systems for security operations. The vulnerability's presence across multiple Dahua product lines suggests a systemic issue within the manufacturer's authentication implementation, potentially affecting thousands of devices deployed in enterprise, commercial, and government environments. Organizations may face regulatory compliance issues, data breaches, and potential physical security compromises as a result of this authentication bypass vulnerability.
Mitigation strategies for CVE-2017-7927 should focus on immediate firmware updates provided by Dahua to address the authentication implementation flaw. Network administrators should implement additional security controls including network segmentation, access control lists, and monitoring of authentication attempts to detect potential exploitation attempts. The vulnerability's classification under ATT&CK technique T1078, which covers valid accounts and legitimate credentials, highlights the need for comprehensive credential management and monitoring practices. Organizations should also consider implementing network-based intrusion detection systems to monitor for unusual authentication patterns and ensure that all affected devices receive timely security updates. Additionally, physical security measures should be reinforced around networked devices, as the vulnerability allows for remote exploitation without requiring physical access to the equipment. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of affected devices within the network infrastructure.