CVE-2018-16171 in Remote Service
Summary
by MITRE
Directory traversal vulnerability in Cybozu Remote Service 3.0.0 to 3.1.8 allows remote attackers to execute Java code file on the server via unspecified vectors.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 04/27/2020
The vulnerability identified as CVE-2018-16171 represents a critical directory traversal flaw within Cybozu Remote Service versions 3.0.0 through 3.1.8. This security weakness enables remote attackers to manipulate file access paths and potentially execute arbitrary Java code on the affected server systems. The vulnerability stems from insufficient input validation and improper handling of file system access requests within the application's remote service functionality.
This directory traversal vulnerability operates by allowing attackers to manipulate file path parameters in such a way that they can navigate outside the intended directory structure and access restricted files or directories. The flaw specifically affects how the Cybozu Remote Service processes file system requests, creating opportunities for attackers to bypass normal access controls and gain unauthorized access to sensitive system resources. The unspecified vectors mentioned in the description suggest that multiple attack pathways may exist within the service's implementation, making the vulnerability particularly dangerous as it could be exploited through various methods.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it provides attackers with the capability to execute Java code directly on the server. This code execution capability represents a severe security risk that could allow threat actors to install malware, steal sensitive data, modify system configurations, or establish persistent access to the compromised environment. The vulnerability affects organizations using Cybozu Remote Service within their infrastructure, potentially exposing critical business data and systems to compromise. Attackers could leverage this vulnerability to perform reconnaissance, escalate privileges, or launch further attacks against other systems within the network.
The technical implementation of this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. This weakness is categorized under the broader set of software vulnerabilities that affect input validation and access control mechanisms. The ATT&CK framework would classify this vulnerability under T1059.007 for Windows Command Shell and T1059.006 for Unix Shell, as the exploitation could potentially involve executing code through shell commands. Organizations should implement immediate mitigations including updating to patched versions of Cybozu Remote Service, implementing proper input validation, and restricting file system access permissions. Network segmentation and intrusion detection systems should also be deployed to monitor for exploitation attempts, while regular security assessments should verify the effectiveness of implemented controls.