CVE-2018-15520 in Device
Summary
by MITRE
Various Lexmark devices have a Buffer Overflow (issue 2 of 2).
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Analysis
by VulDB Data Team • 06/28/2020
The vulnerability identified as CVE-2018-15520 represents a critical buffer overflow flaw affecting multiple Lexmark printing devices, specifically impacting the second of two related issues within the same vulnerability family. This vulnerability resides within the device's firmware or embedded software components that handle data processing and network communications, creating a potential entry point for malicious actors to exploit the affected systems. The buffer overflow occurs when the device fails to properly validate input data length before processing, allowing attackers to overwrite adjacent memory locations and potentially execute arbitrary code on the affected devices.
The technical nature of this buffer overflow vulnerability places it firmly within CWE-121, which describes buffer overflow conditions where insufficient bounds checking allows data to be written beyond the allocated buffer space. The flaw manifests when Lexmark devices receive specially crafted input through network protocols or direct device interfaces, particularly affecting communication channels that handle print jobs, configuration updates, or diagnostic data. Attackers can leverage this vulnerability to inject malicious payloads that may lead to complete device compromise, enabling unauthorized access to sensitive data, modification of device configurations, or even persistent backdoor installation for continued unauthorized access. The vulnerability's impact extends beyond simple device disruption as it can potentially allow attackers to establish persistent access points within network environments where these devices operate.
From an operational perspective, the exploitation of CVE-2018-15520 poses significant risks to enterprise environments that rely on Lexmark printing infrastructure, particularly in sectors handling sensitive information such as healthcare, finance, and government operations. The vulnerability's presence in network-connected printing devices creates a persistent attack surface that can be leveraged for lateral movement within corporate networks, as printers often maintain access to multiple network segments and may contain credentials or data that can be exploited further. The attack vector typically involves sending malformed data packets to the affected device's network interface, triggering the buffer overflow condition that allows attackers to execute code with the privileges of the device's operating system. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, specifically through the use of embedded systems and device management interfaces that can be leveraged for code execution and privilege escalation.
Organizations must implement immediate mitigation strategies including firmware updates from Lexmark to address the buffer overflow condition, network segmentation to limit access to affected devices, and monitoring for unusual network traffic patterns that may indicate exploitation attempts. The vulnerability requires careful consideration of the device's operational environment and potential impact on business continuity, as complete device replacement or firmware updates may be necessary to fully remediate the risk. Network administrators should also consider implementing intrusion detection systems that can identify and alert on suspicious communication patterns originating from affected devices, particularly focusing on unusual data packet sizes or malformed network requests that could indicate exploitation attempts. Regular vulnerability assessments and device inventory management become critical components of ongoing security posture maintenance, ensuring that all embedded systems within the organization are properly maintained and updated against known vulnerabilities.