CVE-2016-6536 in EH6108H+ Hybrid DVR
Summary
by MITRE
The /setup URI on AVer Information EH6108H+ devices with firmware X9.03.24.00.07l allows remote attackers to bypass intended page-access restrictions or modify passwords by leveraging knowledge of a handle parameter value.
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Analysis
by VulDB Data Team • 11/02/2024
The CVE-2016-6536 vulnerability affects AVer Information EH6108H+ devices running firmware version X9.03.24.00.07l and specifically targets the /setup URI endpoint which serves as a critical administrative interface for device configuration and management. This vulnerability represents a significant authorization bypass flaw that undermines the security model of the device by allowing unauthenticated attackers to gain access to restricted administrative functions through manipulation of a handle parameter value. The issue stems from inadequate input validation and authentication checks within the device's web interface implementation, creating a pathway for remote exploitation without proper credentials or authorization.
The technical flaw manifests in the device's handling of the handle parameter within the setup URI, where the system fails to properly validate or authenticate requests before granting access to administrative functions. This parameter appears to serve as a session identifier or access token that should normally be generated and validated through proper authentication mechanisms. However, attackers can exploit their knowledge of valid handle values to bypass the intended access control restrictions and gain unauthorized access to device configuration pages, including those responsible for password modification functions. The vulnerability operates under the weakness category of CWE-285: Improper Authorization, which specifically addresses situations where systems fail to properly enforce access controls for protected resources.
Operationally, this vulnerability presents a severe risk to network security as it allows remote attackers to perform administrative actions without proper authentication, potentially enabling complete device compromise. Attackers can leverage this flaw to modify device passwords, change network configurations, access sensitive device settings, and potentially establish persistent access points within the network. The remote nature of the attack means that adversaries do not require physical access or network proximity to exploit the vulnerability, making it particularly dangerous in environments where such devices are exposed to external networks or the internet. This flaw directly aligns with attack patterns described in the MITRE ATT&CK framework under the T1078 technique for Valid Accounts and T1021.001 technique for Remote Services, as it enables unauthorized access to device administration interfaces.
The impact extends beyond simple unauthorized access to include potential data compromise and network disruption, as administrators may unknowingly grant access to malicious actors who can manipulate device settings to redirect traffic, disable security features, or establish backdoor access. Organizations should consider implementing network segmentation to isolate these devices from critical network segments, deploying intrusion detection systems to monitor for exploitation attempts, and ensuring immediate firmware updates are applied to address the vulnerability. The vulnerability highlights the importance of proper input validation and authentication mechanisms in embedded web interfaces, emphasizing the need for robust security controls in IoT and network device implementations to prevent unauthorized administrative access and maintain overall network integrity.