CVE-2016-8561 in SIMATIC CP 1543-1
Summary
by MITRE
Siemens SIMATIC CP 1543-1 before 2.0.28 allows remote authenticated users to gain privileges by leveraging certain TIA-Portal access and project-data access.
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Analysis
by VulDB Data Team • 10/04/2022
The vulnerability identified as CVE-2016-8561 affects Siemens SIMATIC CP 1543-1 communication processors running firmware versions prior to 2.0.28. This device serves as a critical component in industrial automation systems, facilitating communication between programmable logic controllers and other networked devices within manufacturing environments. The flaw resides in the TIA Portal access mechanisms and project data handling capabilities, creating a pathway for malicious actors to escalate their privileges within the system. The vulnerability specifically targets the authentication and authorization controls implemented within the device's firmware, potentially allowing an attacker with valid credentials to perform unauthorized actions that should be restricted to administrators or privileged users.
This privilege escalation vulnerability stems from insufficient access control validation within the communication processor's firmware implementation. The affected device operates within industrial control systems where security is paramount, yet the flaw allows authenticated users to exploit weaknesses in the project data access controls. The technical implementation appears to lack proper validation of user permissions when accessing certain project data elements, enabling an attacker to manipulate access controls and gain elevated privileges. The vulnerability is particularly concerning because it requires only authenticated access, meaning that an attacker who has already compromised legitimate user credentials can leverage this flaw to move laterally within the industrial network. This weakness represents a failure in the principle of least privilege, where the system does not adequately enforce access restrictions for different user roles.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can compromise the integrity and availability of industrial control systems. In manufacturing environments, the CP 1543-1 device often serves as a gateway for critical automation processes, and unauthorized privilege escalation could lead to production disruptions, data manipulation, or system compromise. Attackers could potentially modify project configurations, access sensitive operational data, or disrupt industrial processes that rely on the communication processor's functionality. The vulnerability also creates opportunities for attackers to establish persistent access within industrial networks, as the elevated privileges could enable them to install backdoors or modify system configurations to maintain access over time. The potential for cascading effects means that compromise of a single communication processor could impact entire production lines or facility operations.
Organizations should immediately implement firmware updates to version 2.0.28 or later, which contain the necessary patches to address the privilege escalation vulnerability. Network segmentation should be enforced to limit access to industrial control systems and reduce the potential attack surface. Access controls should be reviewed and strengthened to ensure that users have only the minimum permissions necessary for their roles, implementing the principle of least privilege as recommended by the CWE standard. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues across the industrial control system infrastructure. The vulnerability also highlights the importance of secure configuration management and access control policies, as outlined in the NIST Cybersecurity Framework and ISO 27001 standards, which emphasize the need for robust authentication and authorization mechanisms in critical infrastructure environments.