CVE-2006-3896 in Cryptostor Tape 700
Summary
by MITRE
The NeoScale Systems CryptoStor 700 series appliance before 2.6 relies on client-side ActiveX code for smartcard authentication, which allows remote attackers to bypass smartcard authentication, and gain access if able to present a valid username and password, by disabling ActiveX.
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Analysis
by VulDB Data Team • 07/22/2024
The NeoScale Systems CryptoStor 700 series appliance presents a critical authentication bypass vulnerability that fundamentally undermines its security architecture. This vulnerability affects versions prior to 2.6 and stems from the appliance's reliance on client-side ActiveX code for smartcard authentication processes. The design flaw creates a dangerous dependency on client-side security mechanisms that can be easily circumvented by determined attackers. The appliance's authentication model assumes that smartcard validation occurs through ActiveX components running in the user's browser environment, creating a single point of failure that malicious actors can exploit. This represents a fundamental misunderstanding of security architecture principles where server-side authentication controls should remain robust regardless of client-side implementation details.
The technical exploitation of this vulnerability occurs through a straightforward yet effective method of disabling ActiveX components within the client browser environment. When ActiveX is disabled, the appliance's smartcard authentication mechanism fails to function properly, allowing attackers to bypass the intended multi-factor authentication process entirely. Attackers need only possess valid username and password credentials to successfully authenticate, as the smartcard component becomes irrelevant when ActiveX is disabled. This creates a scenario where the security controls that should provide additional layers of protection are completely neutralized through simple browser configuration changes. The vulnerability demonstrates a classic case of insufficient server-side validation where the system cannot independently verify authentication credentials without relying on client-side components that can be easily manipulated.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially compromise the entire cryptographic infrastructure managed by the appliance. An attacker who successfully bypasses the smartcard authentication can gain full administrative access to the CryptoStor 700 series appliance, potentially leading to unauthorized cryptographic key management, data encryption manipulation, and complete control over the protected information systems. The vulnerability creates a situation where the security controls that should provide strong authentication assurance are rendered ineffective through simple client-side configuration changes. This type of vulnerability is particularly dangerous in enterprise environments where cryptographic appliances protect sensitive data and critical infrastructure components. The impact is amplified when considering that the appliance likely manages encryption keys and cryptographic operations that are fundamental to data protection and system security.
This vulnerability aligns with CWE-602 Client-Side Enforcement of Server-Side Security, which specifically addresses the issue of relying on client-side controls for security enforcement that should be performed server-side. The flaw also maps to ATT&CK technique T1078 Valid Accounts, as attackers can leverage legitimate credentials to access systems when authentication mechanisms are bypassed. The security architecture fails to implement proper server-side validation of authentication factors, creating a scenario where client-side browser configurations can be manipulated to defeat security controls. Organizations should implement mitigations that enforce server-side authentication verification regardless of client-side component availability. The recommended approach includes implementing mandatory server-side cryptographic verification, disabling client-side ActiveX dependency for critical authentication functions, and ensuring that authentication mechanisms remain robust even when client-side components are disabled or manipulated. Additionally, organizations should consider implementing additional monitoring and logging of authentication attempts to detect potential exploitation attempts.