CVE-2023-40266 in OpenScape Xpressions WebAssistant
Summary
by MITRE • 02/09/2024
An issue was discovered in Atos Unify OpenScape Xpressions WebAssistant V7 before V7R1 FR5 HF42 P911. It allows path traversal.
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Analysis
by VulDB Data Team • 03/02/2024
The vulnerability identified as CVE-2023-40266 affects the Atos Unify OpenScape Xpressions WebAssistant version 7 before V7R1 FR5 HF42 P911, representing a critical path traversal flaw that exposes the system to unauthorized file access and potential data compromise. This issue resides within the web-based management interface of the OpenScape Xpressions platform, which is commonly deployed in enterprise communication environments for managing unified communications services. The vulnerability stems from insufficient input validation and improper handling of file path parameters within the web assistant component, creating an avenue for malicious actors to manipulate directory traversal sequences and access restricted system files. The affected system operates within the context of the web server process, potentially allowing attackers to read sensitive configuration files, user credentials, or other confidential data stored outside the intended web root directory. Path traversal vulnerabilities of this nature typically arise from inadequate sanitization of user-supplied input that is directly used in file system operations without proper validation or encoding. The flaw enables attackers to navigate through the file system hierarchy using sequences such as ../ or ..\ to access files outside the designated directories, potentially leading to complete system compromise or data exfiltration.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it can facilitate further exploitation within the enterprise network environment. Attackers leveraging this path traversal capability may gain access to system configuration files containing database credentials, encryption keys, or other sensitive information that could be used for lateral movement or privilege escalation. The vulnerability affects the web assistant component specifically, which serves as a management interface for the OpenScape Xpressions platform, making it a prime target for attackers seeking to compromise the underlying communication infrastructure. Organizations using this platform may experience significant security implications including potential data breaches, system integrity compromise, and unauthorized access to voice and data communication services. The vulnerability's severity is amplified by the fact that it affects a web-based management interface, which is typically accessible from external networks, making the attack surface more expansive. According to CWE classification, this represents a CWE-22 Path Traversal vulnerability, which is categorized under the broader category of input validation flaws and is commonly associated with the ATT&CK technique T1083 File and Directory Discovery. The attack vector typically involves sending specially crafted requests to the web assistant endpoint, where the path traversal sequences are processed without proper validation, leading to unauthorized file system access.
Mitigation strategies for CVE-2023-40266 should prioritize immediate patch application from Atos, as the vendor has released specific hotfixes and updates to address this vulnerability. Organizations should implement network segmentation to limit access to the affected web assistant interface, ensuring that only authorized administrative personnel can reach the management components. Input validation and sanitization measures should be strengthened at the application level, including the implementation of proper path validation routines that reject or encode directory traversal sequences before they are processed by the file system. Security monitoring should be enhanced to detect suspicious file access patterns or attempts to traverse directories beyond the intended scope. Network-level controls such as web application firewalls can provide additional protection by filtering out malicious path traversal attempts. Organizations should also conduct comprehensive vulnerability assessments to identify any other potentially affected components within their OpenScape Xpressions deployment. Regular security audits and penetration testing should be performed to ensure that the implemented mitigations are effective and that no other similar vulnerabilities exist within the system. The remediation process should include thorough testing of the applied patches to ensure that they do not introduce compatibility issues with existing system functionality while effectively addressing the path traversal vulnerability. Compliance with industry standards such as NIST SP 800-53 and ISO 27001 should be maintained throughout the remediation process to ensure proper security controls are in place.