CVE-2017-12092 in MicroLogix 1400
Summary
by MITRE
An exploitable file write vulnerability exists in the memory module functionality of Allen Bradley Micrologix 1400 Series B FRN 21.2 and before. A specially crafted packet can cause a file write resulting in a new program being written to the memory module. An attacker can send an unauthenticated packet to trigger this vulnerability.
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Analysis
by VulDB Data Team • 03/21/2023
The vulnerability identified as CVE-2017-12092 represents a critical file write flaw within the memory module functionality of Allen Bradley Micrologix 1400 Series B controllers running firmware versions 21.2 and earlier. This weakness resides in industrial control systems that are fundamental to manufacturing and process automation environments, where the integrity of programmable logic controllers directly impacts operational safety and security. The vulnerability specifically affects the communication protocols used by these devices, creating an attack surface that can be exploited without requiring authentication credentials.
This exploitable condition stems from insufficient input validation within the memory module handling code of the Micrologix 1400 series controllers. When a specially crafted network packet is transmitted to the device, the system fails to properly validate the incoming data before executing file write operations. The flaw allows an attacker to inject malicious data that gets interpreted as legitimate memory modification commands, resulting in the creation of new program files within the controller's memory module. This behavior aligns with CWE-732: Incorrect Permission Assignment for Critical Resource, as the system grants unauthorized write access to memory components that should be protected from external manipulation.
The operational impact of this vulnerability extends beyond simple unauthorized file creation, as it provides attackers with a potential pathway for persistent system compromise and operational disruption. Industrial environments utilizing these controllers face significant risks including unauthorized program modifications, which could lead to production line failures, safety system bypasses, or complete operational shutdowns. The vulnerability's unauthenticated nature means that any network-connected device within range can exploit this weakness, making it particularly dangerous in industrial settings where physical security boundaries may be compromised or where network segmentation is inadequate.
From a threat modeling perspective, this vulnerability maps to several ATT&CK techniques including T1059.005: Command and Scripting Interpreter - PowerShell and T1566.001: Phishing - Spearphishing Attachment, as attackers could potentially use this flaw to deploy malicious code. The lack of authentication requirements makes this a particularly attractive target for adversaries seeking to establish persistent access within industrial control systems. Organizations should consider implementing network segmentation, disabling unnecessary network services, and applying firmware updates to address this vulnerability. The flaw also highlights the broader security challenges in industrial environments where legacy systems often lack modern security features and where the primary focus on operational continuity can sometimes compromise security considerations.