CVE-2007-5326 in BrightStor ARCServe BackUp
Summary
by MITRE
Multiple buffer overflows in (1) RPC and (2) rpcx.dll in CA BrightStor ARCServe BackUp v9.01 through R11.5, and Enterprise Backup r10.5, allow remote attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 07/27/2019
The vulnerability identified as CVE-2007-5326 represents a critical security flaw affecting CA BrightStor ARCServe Backup software versions 9.01 through R11.5 and Enterprise Backup r10.5. This vulnerability manifests as multiple buffer overflows within the Remote Procedure Call (RPC) functionality and specifically within the rpcx.dll library component. The affected software operates within enterprise backup and recovery environments, making it a significant target for attackers seeking to compromise critical data infrastructure. The buffer overflow conditions occur when processing unsanitized input data from remote connections, creating opportunities for malicious actors to inject and execute arbitrary code on vulnerable systems. These flaws are particularly dangerous because they can be exploited remotely without requiring authentication, potentially allowing attackers to gain full system control from external network positions.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers stack-based buffer overflow scenarios. The flaw occurs in the RPC processing layer where insufficient input validation and bounds checking allow attackers to overwrite adjacent memory locations in the rpcx.dll module. When the software receives malformed RPC requests containing oversized data payloads, the buffer overflow conditions trigger memory corruption that can be leveraged to redirect program execution flow. The attack vectors remain unspecified in the initial vulnerability report, suggesting that multiple entry points within the RPC infrastructure could be exploited, potentially including various backup protocols and network communication channels. This ambiguity increases the attack surface and makes comprehensive mitigation more challenging for system administrators.
The operational impact of CVE-2007-5326 extends beyond simple remote code execution, as successful exploitation can lead to complete system compromise and data exfiltration. Organizations utilizing CA BrightStor ARCServe Backup in production environments face significant risks including unauthorized data access, backup data corruption, and potential lateral movement within network infrastructure. The vulnerability affects backup servers and storage management systems that are often considered critical infrastructure components, making them attractive targets for sophisticated attackers. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1059.007 for remote code execution and T1566 for initial access through network services. The impact is particularly severe in enterprise environments where backup systems often contain sensitive data and operate with elevated privileges, potentially providing attackers with access to backup credentials and system-wide data repositories.
Mitigation strategies for CVE-2007-5326 require immediate attention from system administrators and security teams. The primary recommendation involves applying vendor-provided patches and updates to upgrade affected software versions to those containing fixed RPC processing code and improved input validation routines. Network segmentation and firewall rules should be implemented to restrict unnecessary RPC traffic to backup servers, limiting potential attack vectors. Additionally, monitoring network traffic for unusual RPC communication patterns can help detect exploitation attempts. System hardening measures including disabling unnecessary services, implementing strict access controls, and maintaining regular security audits are essential. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious RPC traffic patterns. The vulnerability highlights the importance of maintaining up-to-date security patches and proper input validation practices in enterprise backup infrastructure, as these systems often serve as gateways to critical organizational data repositories.