CVE-2017-8864 in 3960HD
Summary
by MITRE
Client-side enforcement using JavaScript of server-side security options on the Cohu 3960HD allows an attacker to manipulate options sent to the camera and cause malfunction or code execution, as demonstrated by a client-side "if (!passwordsAreEqual())" test.
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Analysis
by VulDB Data Team • 12/09/2019
The CVE-2017-8864 vulnerability represents a critical security flaw in the Cohu 3960HD camera system where client-side JavaScript enforcement undermines the intended server-side security controls. This vulnerability stems from a fundamental architectural weakness where the camera's security mechanisms rely on client-side validation rather than robust server-side implementation, creating a dangerous attack surface that allows adversaries to bypass critical security measures. The flaw manifests when the system employs JavaScript-based checks such as "if (!passwordsAreEqual())" to validate authentication credentials, effectively delegating security responsibility to the client-side environment where malicious actors can easily manipulate the validation logic.
The technical implementation of this vulnerability exploits the principle of security through obscurity and client-side trust assumptions that are inherently flawed in networked security systems. When the camera's JavaScript code performs password validation checks on the client side, attackers can modify the JavaScript execution environment to bypass these checks entirely. This approach directly violates the security principle that critical validation should occur on the server-side where the attacker cannot easily interfere with the execution flow. The vulnerability specifically targets the authentication mechanism of the camera system, allowing unauthorized users to manipulate the security options sent to the device, potentially leading to complete system compromise.
The operational impact of this vulnerability extends beyond simple authentication bypass to encompass potential system malfunction and code execution capabilities. Attackers can manipulate the camera's operational parameters through client-side JavaScript manipulation, potentially causing the device to malfunction or execute arbitrary code within the camera's environment. This represents a severe escalation from simple unauthorized access to full system compromise, as the attacker can leverage the client-side manipulation to influence the camera's behavior in ways that could affect surveillance operations, data integrity, and overall network security. The vulnerability enables attackers to essentially take control of the camera's operational parameters, potentially allowing them to disable security features, alter recording settings, or execute malicious code on the device itself.
This vulnerability aligns with CWE-693, which addresses protection mechanism failures, and demonstrates the dangers of relying on client-side controls for security-critical operations. The attack pattern follows ATT&CK technique T1059.007 for JavaScript execution and T1078 for legitimate credential use, as attackers can manipulate the authentication flow to gain unauthorized access. The security implications extend to broader network compromise scenarios where camera systems serve as entry points for lateral movement within enterprise environments. Organizations should implement comprehensive mitigations including server-side validation enforcement, disabling unnecessary client-side JavaScript controls, and implementing proper input validation mechanisms that cannot be bypassed through client-side manipulation. Additionally, network segmentation and monitoring of camera communications can help detect anomalous behavior that may indicate exploitation attempts.
The fundamental flaw in this vulnerability highlights the critical importance of server-side security implementation and the dangers of trusting client-side validation for critical security functions. Proper implementation would require that all security decisions, particularly authentication and authorization, be made on the server-side where the attacker cannot manipulate the execution environment. This vulnerability serves as a prime example of why security-by-design principles must be strictly enforced and why client-side controls should never be considered sufficient for protecting critical system functions. The mitigation strategies should include comprehensive code reviews to identify similar client-side trust assumptions, implementation of server-side validation that cannot be circumvented, and regular security assessments to ensure that authentication mechanisms remain robust against manipulation attempts.