CVE-2016-5675 in ReadyNAS Surveillance
Summary
by MITRE
handle_daylightsaving.php in NUUO NVRmini 2 1.7.5 through 3.0.0, NUUO NVRsolo 1.0.0 through 3.0.0, NUUO Crystal 2.2.1 through 3.2.0, and NETGEAR ReadyNAS Surveillance 1.1.1 through 1.4.1 allows remote attackers to execute arbitrary PHP code via the NTPServer parameter.
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Analysis
by VulDB Data Team • 12/05/2024
The vulnerability CVE-2016-5675 represents a critical remote code execution flaw affecting multiple network video recorder systems manufactured by NUUO and NETGEAR. This vulnerability exists in the handle_daylightsaving.php script which processes user-supplied input through the NTPServer parameter without proper sanitization or validation. The affected products include NUUO NVRmini 2 versions 1.7.5 through 3.0.0, NUUO NVRsolo 1.0.0 through 3.0.0, NUUO Crystal 2.2.1 through 3.2.0, and NETGEAR ReadyNAS Surveillance 1.1.1 through 1.4.1. The flaw stems from insufficient input validation mechanisms that fail to properly filter or escape user-provided data before processing, creating an avenue for malicious actors to inject and execute arbitrary PHP code on the affected systems.
This vulnerability operates under the Common Weakness Enumeration CWE-94 category, specifically addressing weaknesses in the execution of code through improper input validation. The technical implementation allows attackers to manipulate the NTPServer parameter which is then passed directly to the PHP script without adequate sanitization. The attack vector is particularly dangerous as it enables remote code execution from outside the network perimeter, making it accessible to attackers without requiring physical access or prior authentication. The vulnerability demonstrates a classic case of command injection or code injection where user-controllable input is directly incorporated into server-side script execution without proper security controls.
The operational impact of CVE-2016-5675 extends beyond simple unauthorized access to encompass complete system compromise and potential data breaches. Once exploited, attackers can execute arbitrary commands with the privileges of the web server process, potentially gaining access to sensitive surveillance footage, system configurations, and network credentials. The affected systems typically store critical security-related data including video recordings, user accounts, and network settings, making them attractive targets for cybercriminals. The vulnerability also poses risks to network infrastructure as compromised surveillance systems can serve as entry points for lateral movement within enterprise networks, particularly in environments where these devices are integrated with critical business operations.
Security mitigations for this vulnerability require immediate patching of affected firmware versions, as the original vendors released updates to address the input validation flaws. Network segmentation should be implemented to isolate surveillance systems from critical business networks, while firewall rules should restrict access to affected services to only trusted sources. Additionally, implementing web application firewalls and input validation controls can provide additional defense layers. Organizations should conduct comprehensive vulnerability assessments to identify all instances of affected devices within their networks and ensure proper access controls are in place. The ATT&CK framework categorizes this vulnerability under T1059.007 for PHP code injection, emphasizing the need for proper input validation and output encoding to prevent such attacks. Regular security monitoring and log analysis should be implemented to detect potential exploitation attempts, while maintaining updated threat intelligence to stay informed about emerging attack patterns targeting similar vulnerabilities in network security infrastructure.