CVE-2022-26838 in Remote Service
Summary
by MITRE • 08/03/2023
Path traversal vulnerability in Importing Mobile Device Data of Cybozu Remote Service 3.1.2 allows a remote authenticated attacker to cause a denial-of-service (DoS) condition.
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Analysis
by VulDB Data Team • 08/26/2023
The CVE-2022-26838 vulnerability represents a path traversal flaw within the Cybozu Remote Service version 3.1.2 that specifically affects the mobile device data importing functionality. This vulnerability resides in the processing of file paths during data import operations, where inadequate input validation permits maliciously crafted file paths to be processed by the system. The vulnerability is classified as a path traversal issue because it allows an attacker to manipulate file system access through specially crafted input that can bypass normal access controls and directory restrictions. Such vulnerabilities typically arise when applications fail to properly sanitize user-supplied data before using it in file system operations, creating opportunities for attackers to navigate outside intended directories and access restricted files or directories.
The technical implementation of this vulnerability stems from insufficient validation of file path inputs within the mobile device data import module. When an authenticated user submits mobile device data for import, the system processes the provided file paths without adequate sanitization or validation checks. This allows an attacker to include directory traversal sequences such as ../ or ..\ in their input, which can cause the system to navigate to unintended locations within the file system. The vulnerability specifically targets the import functionality, making it particularly dangerous as it requires only authentication to exploit, meaning that any authenticated user with access to the import feature can potentially trigger the condition. The path traversal occurs during the processing of mobile device data where the system attempts to read or write files based on user-provided paths, without proper boundary checks or normalization of the input paths.
The operational impact of CVE-2022-26838 manifests as a denial-of-service condition that can severely disrupt the availability of the Cybozu Remote Service. While the vulnerability is categorized as a DoS condition rather than a more severe compromise like arbitrary code execution or data theft, it can still cause significant operational disruption by rendering the mobile device data import functionality unavailable. The denial-of-service can occur through multiple mechanisms including system resource exhaustion, application crashes, or by causing the system to enter an unstable state where legitimate users cannot perform their intended operations. In a production environment, this vulnerability could lead to service interruptions that affect business operations, particularly in organizations that rely heavily on mobile device data integration for their workflows. The impact is further amplified by the fact that the vulnerability requires only authenticated access, meaning that an attacker with legitimate credentials can exploit it without needing additional privileges or reconnaissance.
The vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. This classification emphasizes the fundamental flaw in input validation and path handling within the application's file system operations. From an attack perspective, this vulnerability maps to several ATT&CK techniques including T1059 for command and scripting interpreter and T1566 for credential access through legitimate credentials, as the attacker needs only valid authentication to exploit the condition. The attack chain typically begins with authentication followed by manipulation of the import functionality to include malicious path traversal sequences, ultimately leading to the denial-of-service condition. Organizations should note that this vulnerability represents a common pattern in web applications where file system access controls are not properly enforced, making it a frequent target for attackers seeking to disrupt services without requiring sophisticated exploitation techniques.
Mitigation strategies for CVE-2022-26838 should focus on implementing robust input validation and sanitization for all file path inputs within the import functionality. The most effective approach involves normalizing and validating all user-supplied paths to ensure they remain within designated directories, implementing proper path resolution techniques, and using allow-list validation for file paths. Organizations should also consider implementing proper access controls that limit the scope of file system operations available to authenticated users, particularly those related to import functionality. Additionally, monitoring and logging of import operations should be enhanced to detect unusual path traversal patterns that might indicate exploitation attempts. The recommended solution includes updating to the latest version of Cybozu Remote Service where this vulnerability has been patched, implementing input validation at multiple layers including application and network levels, and conducting regular security assessments of file handling operations to identify similar path traversal vulnerabilities. System administrators should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts.