CVE-2015-7709 in Arkeia
Summary
by MITRE
The arkeiad daemon in the Arkeia Backup Agent in Western Digital Arkeia 11.0.12 and earlier allows remote attackers to bypass authentication and execute arbitrary commands via a series of crafted requests involving the ARKFS_EXEC_CMD operation.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 11/17/2024
The CVE-2015-7709 vulnerability represents a critical authentication bypass flaw within the Arkeia Backup Agent software developed by Western Digital. This vulnerability specifically affects versions 11.0.12 and earlier of the Arkeia backup solution, where the arkeiad daemon fails to properly validate incoming requests. The flaw manifests through the ARKFS_EXEC_CMD operation which is designed to execute file system commands but lacks adequate security controls to prevent unauthorized access. Attackers can exploit this weakness by crafting a sequence of specially formatted requests that circumvent the normal authentication mechanisms, allowing them to gain elevated privileges and execute arbitrary commands on the affected system.
The technical implementation of this vulnerability stems from insufficient input validation and authentication checks within the arkeiad daemon process. When the daemon receives requests containing the ARKFS_EXEC_CMD operation, it does not adequately verify the authenticity of the requesting entity or validate the legitimacy of the commands being executed. This design flaw creates a path for remote attackers to manipulate the system's command execution flow without proper authorization. The vulnerability operates at the protocol level where the daemon's security model fails to distinguish between legitimate administrative operations and maliciously crafted requests, effectively allowing unauthorized command execution.
From an operational impact perspective, this vulnerability poses significant risks to organizations relying on Western Digital's Arkeia backup solutions. Remote attackers who successfully exploit this vulnerability can gain complete control over the backup server, potentially leading to data exfiltration, system compromise, or disruption of backup operations. The ability to execute arbitrary commands means attackers can modify system files, install malicious software, or disable backup services entirely. This could result in catastrophic data loss scenarios where backup systems become compromised and unable to restore critical business data. The remote nature of the attack means that adversaries do not require physical access to the system and can exploit the vulnerability from anywhere on the network.
Security practitioners should consider this vulnerability in relation to established frameworks such as CWE-287 which addresses improper authentication issues, and ATT&CK techniques involving privilege escalation and command execution. The vulnerability aligns with ATT&CK tactic TA0004 (Privilege Escalation) and technique T1059 (Command and Scripting Interpreter) as attackers can leverage the authenticated command execution to gain deeper system access. Organizations should implement immediate mitigations including upgrading to patched versions of the Arkeia backup agent, implementing network segmentation to limit access to backup servers, and monitoring for suspicious command execution patterns. Additional protective measures include disabling unnecessary network services, implementing strong access controls, and conducting regular security assessments to identify similar authentication bypass vulnerabilities in other backup and storage systems.