CVE-2012-2971 in ARCserve Backup
Summary
by MITRE
The server in CA ARCserve Backup r12.5, r15, and r16 on Windows does not properly process RPC requests, which allows remote attackers to execute arbitrary code or cause a denial of service via a crafted request.
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Analysis
by VulDB Data Team • 04/18/2021
The vulnerability identified as CVE-2012-2971 represents a critical security flaw in CA ARCserve Backup server implementations across versions r12.5, r15, and r16 on Windows platforms. This issue stems from improper handling of Remote Procedure Call (RPC) requests within the backup server component, creating a significant attack surface that adversaries can exploit to gain unauthorized system access or disrupt service availability. The vulnerability specifically affects the server-side processing logic that manages incoming RPC communications, which form the backbone of distributed backup operations and remote management capabilities.
The technical root cause of this vulnerability lies in insufficient input validation and improper request processing within the RPC handling mechanisms of the ARCserve Backup server. When the server receives crafted RPC requests, it fails to adequately sanitize or validate the incoming data structures, leading to potential buffer overflows, memory corruption, or arbitrary code execution within the context of the running service. This flaw operates at the protocol level where RPC requests are processed, making it particularly dangerous as it can be triggered through standard network communication channels without requiring authentication or privileged access. The vulnerability falls under the category of improper input validation as classified by CWE-20, which directly maps to the weakness in the RPC request processing logic that allows attackers to manipulate the expected data formats.
From an operational impact perspective, this vulnerability presents severe risks to organizations relying on CA ARCserve Backup for their data protection infrastructure. Remote attackers who successfully exploit this vulnerability can execute arbitrary code on the affected systems, potentially leading to complete system compromise, data exfiltration, or lateral movement within the network. The ability to cause denial of service through crafted RPC requests further compounds the threat landscape, as it can disrupt backup operations and potentially lead to data loss scenarios. Organizations may experience service interruptions during critical backup windows, while the potential for privilege escalation could allow attackers to establish persistent access to their backup infrastructure, which often contains sensitive organizational data.
The attack surface for this vulnerability is particularly concerning given that RPC services are typically exposed on standard network ports and may be accessible from untrusted networks. The vulnerability can be exploited through various attack vectors including network-based scanning and automated exploitation tools that target known RPC interfaces. According to ATT&CK framework, this vulnerability maps to techniques involving remote code execution and service exploitation, with potential for privilege escalation and persistence establishment. Organizations should consider implementing network segmentation to limit access to RPC ports, deploying intrusion detection systems to monitor for suspicious RPC traffic patterns, and ensuring that backup servers are properly hardened against network-based attacks. The remediation approach should include immediate patching of affected systems, implementation of network access controls, and comprehensive monitoring of backup server activities to detect potential exploitation attempts.
Security professionals should also evaluate their backup infrastructure for similar vulnerabilities in other backup solutions and ensure proper network architecture design that minimizes exposure of critical backup services. The vulnerability demonstrates the importance of proper input validation in distributed systems and highlights the need for comprehensive security testing of RPC interfaces in enterprise backup solutions. Organizations must maintain updated inventory of all backup systems and ensure timely patch management to protect against similar vulnerabilities in their data protection infrastructure.