CVE-2018-0555 in WZR-1750DHP2
Summary
by MITRE
Buffer overflow in Buffalo WZR-1750DHP2 Ver.2.30 and earlier allows an attacker to execute arbitrary code via a specially crafted file.
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Analysis
by VulDB Data Team • 01/23/2020
The vulnerability identified as CVE-2018-0555 represents a critical buffer overflow flaw affecting Buffalo WZR-1750DHP2 routers running firmware versions 2.30 and earlier. This vulnerability resides within the device's handling of specially crafted files, creating a pathway for remote code execution that could allow attackers to completely compromise the affected network infrastructure. The issue stems from inadequate input validation and memory management within the router's firmware, specifically in how it processes external file inputs. The buffer overflow occurs when the device attempts to store data in a fixed-length buffer without proper bounds checking, allowing malicious data to overwrite adjacent memory locations and potentially overwrite critical program execution pointers or instructions.
This vulnerability directly maps to CWE-121, which describes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite memory locations and potentially execute arbitrary code. The operational impact of CVE-2018-0555 extends beyond simple exploitation as it provides attackers with persistent access to the network infrastructure, enabling them to establish backdoors, monitor network traffic, and potentially use the compromised device as a pivot point for attacking other systems within the network. The vulnerability is particularly concerning because it affects enterprise and home networking equipment that often lack proper security updates and may remain operational for extended periods without firmware upgrades. Attackers leveraging this vulnerability could gain unauthorized access to sensitive network data, manipulate network traffic, or use the compromised device for launching further attacks against other systems.
The exploitation of CVE-2018-0555 aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to initial access through network services and privilege escalation via code execution. The vulnerability creates opportunities for attackers to establish persistent presence within networks while bypassing traditional network security controls that rely on perimeter defense. Organizations using affected Buffalo routers should immediately implement network segmentation to limit the potential impact of such compromises, deploy intrusion detection systems to monitor for suspicious network activity, and ensure that all network devices receive regular firmware updates. The vulnerability underscores the importance of firmware security practices and highlights the need for manufacturers to implement robust input validation mechanisms and regular security assessments. Network administrators should also consider implementing network monitoring solutions that can detect anomalous behavior patterns consistent with exploitation attempts, as well as maintaining comprehensive network inventory to identify all potentially affected devices.