CVE-2019-6022 in Office
Summary
by MITRE
Directory traversal vulnerability in Cybozu Office 10.0.0 to 10.8.3 allows remote authenticated attackers to alter arbitrary files via the 'Customapp' function.
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Analysis
by VulDB Data Team • 03/17/2024
The vulnerability identified as CVE-2019-6022 represents a critical directory traversal flaw within Cybozu Office versions 10.0.0 through 10.8.3. This security weakness specifically affects the Customapp function, which is designed to allow users to customize applications within the office suite. The vulnerability stems from insufficient input validation and improper path handling when processing user-supplied data through the Customapp feature. Attackers can exploit this flaw by crafting malicious requests that manipulate file paths, enabling them to traverse the directory structure beyond intended boundaries. The issue manifests as a failure to properly sanitize or validate file paths, allowing attackers to access and modify files outside the designated application directories.
This directory traversal vulnerability operates at the core of file system access controls within the Cybozu Office environment. When users interact with the Customapp function, the application processes input parameters without adequate validation mechanisms to prevent path manipulation. The flaw enables attackers to construct malicious file paths that bypass normal access controls, potentially allowing them to overwrite system files, inject malicious code, or access sensitive data that should remain protected. The vulnerability is authenticated, meaning that attackers must first establish valid credentials to exploit the flaw, but once authenticated, the impact extends beyond normal user privileges. The technical implementation appears to lack proper input sanitization and path resolution checks that would normally prevent such traversal attacks.
The operational impact of CVE-2019-6022 extends beyond simple file modification capabilities and presents significant risks to organizational security infrastructure. Remote authenticated attackers can leverage this vulnerability to perform arbitrary file alterations, potentially compromising the integrity of the entire office suite installation. The vulnerability could enable attackers to modify critical application components, inject backdoors, or establish persistent access points within the system. Organizations using affected versions of Cybozu Office face potential data breaches, system compromise, and disruption of business operations. The authenticated nature of the exploit means that insider threats or compromised accounts could pose particularly serious risks, as attackers would not need to perform additional reconnaissance or credential harvesting to exploit this flaw.
Security mitigations for this vulnerability should focus on immediate patch management and input validation improvements. Organizations must upgrade to patched versions of Cybozu Office that address the directory traversal flaw in the Customapp function. Additionally, implementing proper input validation and sanitization measures within the application code can help prevent similar issues. Network segmentation and access control measures should be strengthened to limit the potential impact of credential compromise. The vulnerability aligns with CWE-22 Directory Traversal and follows patterns commonly associated with attack techniques documented in the MITRE ATT&CK framework under T1059 Command and Scripting Interpreter and T1078 Valid Accounts. System administrators should conduct thorough security assessments to identify any potential exploitation attempts and implement monitoring for suspicious file access patterns that might indicate exploitation of this vulnerability.