CVE-2017-16566 in IP Camera A5
Summary
by MITRE
On Jooan IP Camera A5 2.3.36 devices, an insecure FTP server does not require authentication, which allows remote attackers to read or replace core system files including those used for authentication (such as passwd and shadow). This can be abused to take full root level control of the device.
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Analysis
by VulDB Data Team • 12/08/2019
The CVE-2017-16566 vulnerability affects Jooan IP Camera A5 devices running firmware version 2.3.36 and represents a critical security flaw in the device's file transfer protocol implementation. This vulnerability stems from an insecure FTP server configuration that operates without mandatory authentication mechanisms, creating an exploitable entry point for remote attackers. The flaw specifically targets the device's core system files including passwd and shadow files which contain essential authentication credentials and user account information. According to CWE-284, this vulnerability demonstrates an improper access control issue where the system fails to properly enforce authentication requirements for critical system resources. The absence of authentication requirements allows attackers to establish FTP connections and manipulate system files directly, bypassing all normal security controls that would typically protect these sensitive components.
The operational impact of this vulnerability extends far beyond simple unauthorized file access, as it provides attackers with complete control over the device's administrative functions. When attackers can read and replace authentication files, they essentially gain root-level privileges within the device's operating environment, enabling them to modify user accounts, reset passwords, and establish persistent access. This represents a fundamental compromise of the device's security model and aligns with ATT&CK technique T1078 which describes legitimate credentials usage for persistence and privilege escalation. The vulnerability affects not just individual device security but also poses broader network risks as compromised cameras can serve as stepping stones for lateral movement within network infrastructures. The insecure FTP server configuration creates a persistent backdoor that attackers can utilize for extended periods without detection, making it particularly dangerous for surveillance and security applications where device integrity is paramount.
Mitigation strategies for this vulnerability require immediate attention and systematic implementation across affected deployments. The primary recommendation involves updating device firmware to versions that properly implement authentication requirements for FTP services and other network protocols. Network segmentation and firewall rules should be implemented to restrict access to FTP ports and other potentially vulnerable services to trusted network segments only. Regular security audits and vulnerability assessments should be conducted to identify and remediate similar configuration flaws in other networked devices. The vulnerability also highlights the importance of secure default configurations in embedded systems, where manufacturers should ensure that all network services require proper authentication by default. According to NIST SP 800-53 security controls, organizations should implement continuous monitoring and access control measures to detect and prevent unauthorized access attempts. Additionally, network administrators should disable unnecessary services such as FTP when not required for operational purposes, reducing the attack surface available to potential adversaries. The vulnerability underscores the critical need for robust security practices in IoT devices where default configurations often prioritize convenience over security, leaving systems exposed to well-known exploitation techniques.