CVE-2015-4314 in TelePresence Video Communication Server
Summary
by MITRE
The System Snapshot feature in Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.1 allows remote authenticated users to obtain sensitive password-hash information by reading the snapshot file, aka Bug ID CSCuv40422.
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Analysis
by VulDB Data Team • 06/12/2022
The vulnerability identified as CVE-2015-4314 resides within the System Snapshot functionality of Cisco TelePresence Video Communication Server (VCS) Expressway version 8.5.1. This critical security flaw affects organizations relying on Cisco's video communication infrastructure and represents a significant concern for enterprises managing sensitive communication systems. The vulnerability specifically targets the system's ability to handle snapshot files, which are typically used for backup and recovery operations in telepresence environments. The issue enables remote authenticated attackers to access password hash information, potentially compromising the entire communication infrastructure.
The technical implementation of this vulnerability stems from inadequate access controls and improper file handling within the snapshot generation process. When the system creates a snapshot file, it fails to properly sanitize or restrict access to sensitive authentication data contained within the backup. This flaw allows authenticated users to read the snapshot file directly, extracting password hashes that can be subsequently cracked using various offline attack methods. The vulnerability operates at the application layer and leverages the existing authentication mechanisms to escalate privileges from standard user access to information disclosure capabilities. According to CWE classification, this represents a weakness in the protection of sensitive information, specifically categorized under CWE-200 Information Exposure, where sensitive data is accessible to unauthorized parties.
The operational impact of CVE-2015-4314 extends beyond simple information disclosure, creating a potential pathway for further compromise within the network infrastructure. Attackers who successfully exploit this vulnerability can obtain password hashes that may belong to system administrators, service accounts, or user credentials, depending on the system configuration. This information can be used for credential stuffing attacks, lateral movement within the network, or as part of a broader attack strategy. The vulnerability is particularly concerning because it requires only authenticated access, meaning that an attacker who has already gained some level of access to the system can escalate their privileges. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as Credential Access (T1003) and Privilege Escalation (T1068), enabling adversaries to obtain additional credentials and potentially gain higher-level access to the system.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies to protect their telepresence infrastructure. The primary recommendation involves applying the official Cisco security patches and updates that address the snapshot file access control issues. Network segmentation and access control measures should be strengthened to limit the number of authenticated users who can access the system snapshot functionality. Additionally, implementing robust monitoring and logging of snapshot creation and access events can help detect potential exploitation attempts. Security teams should also conduct thorough credential audits to identify and reset any compromised accounts that may have been accessed through this vulnerability. The implementation of principle of least privilege should be enforced, ensuring that only authorized personnel have access to the system snapshot features. Regular security assessments and penetration testing should be conducted to verify that the mitigations are effective and to identify any additional vulnerabilities that may exist within the telepresence infrastructure.