CVE-2012-4697 in Bl20 Programmable Gateway
Summary
by MITRE
TURCK BL20 Programmable Gateway and BL67 Programmable Gateway have hardcoded accounts, which allows remote attackers to obtain administrative access via an FTP session.
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Analysis
by VulDB Data Team • 02/21/2018
The CVE-2012-4697 vulnerability affects TURCK BL20 and BL67 Programmable Gateways, representing a critical security flaw in industrial control systems that exposes these devices to unauthorized administrative access. These gateways serve as crucial communication bridges in industrial environments, facilitating data exchange between different network protocols and systems. The vulnerability stems from the improper implementation of authentication mechanisms where default credentials are embedded within the firmware, creating a persistent security risk that persists across device deployments and updates.
The technical flaw manifests through hardcoded administrator accounts that remain unchanged regardless of deployment environment or security requirements. This design decision violates fundamental security principles and creates a predictable attack surface that remote adversaries can exploit without requiring any specialized knowledge or tools. The vulnerability specifically targets FTP sessions, which serve as the primary attack vector for gaining administrative access to the device. Attackers can leverage these hardcoded credentials to establish FTP connections and subsequently assume full administrative privileges, bypassing all normal authentication mechanisms and access controls.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it fundamentally compromises the integrity and confidentiality of industrial control systems. Once an attacker gains administrative access through the hardcoded accounts, they can modify device configurations, alter communication protocols, manipulate data flows, and potentially disrupt critical industrial processes. This vulnerability directly violates the principle of least privilege and creates opportunities for attackers to establish persistent access points within industrial networks, making it particularly dangerous in environments where operational technology and information technology converge. The risk is amplified in scenarios where these gateways connect to critical infrastructure components, as unauthorized access could lead to cascading failures or security breaches affecting entire industrial operations.
Organizations should immediately implement mitigation strategies including changing default credentials, disabling unnecessary services such as FTP access, and implementing network segmentation to isolate these devices from critical operational networks. Security monitoring should be enhanced to detect unauthorized FTP connections and unusual administrative activities. From a compliance perspective, this vulnerability directly relates to CWE-798, which addresses the use of hard-coded credentials, and aligns with ATT&CK techniques involving credential access and privilege escalation. Regular firmware updates and security assessments should be mandated to prevent similar vulnerabilities from persisting in industrial control system deployments and to maintain adherence to security frameworks such as NIST SP 800-82 and IEC 62443 standards that govern industrial cybersecurity practices.