CVE-2006-4128 in Backup Exec
Summary
by MITRE
Multiple heap-based buffer overflows in Symantec VERITAS Backup Exec for Netware Server Remote Agent for Windows Server 9.1 and 9.2 (all builds), Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 (builds 10.1.325.6301, 10.1.326.1401, 10.1.326.2501, 10.1.326.3301, and 10.1.327.401), and Backup Exec for Windows Server and Remote Agent 9.1 (build 9.1.4691), 10.0 (builds 10.0.5484 and 10.0.5520), and 10.1 (build 10.1.5629) allow remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a crafted RPC message.
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Analysis
by VulDB Data Team • 06/18/2025
The vulnerability identified as CVE-2006-4128 represents a critical heap-based buffer overflow issue affecting multiple Symantec Backup Exec products across different server platforms. This vulnerability specifically targets the remote agent components of Symantec's backup solutions, which are widely deployed in enterprise environments for data protection and recovery operations. The affected versions include Backup Exec for Netware Server Remote Agent for Windows Server 9.1 and 9.2, Backup Exec Continuous Protection Server Remote Agent for Windows Server 10.1 with specific build numbers, and various versions of Backup Exec for Windows Server and Remote Agent spanning from 9.1 through 10.1. These products form part of the broader Symantec backup ecosystem that organizations rely upon for critical data protection functions.
The technical flaw manifests as heap-based buffer overflows within the RPC message processing mechanisms of these backup agents. When the affected software receives a specially crafted RPC message, the insufficient bounds checking allows an attacker to write data beyond the allocated buffer boundaries in the heap memory space. This memory corruption can result in unpredictable application behavior, including application crashes, system instability, and in some cases, the potential for arbitrary code execution. The vulnerability is particularly concerning because it operates over network connections, making it exploitable by remote attackers without requiring local system access. The heap overflow conditions occur during the processing of remote procedure calls, which are fundamental to how these backup agents communicate with backup servers and manage backup operations across networked environments.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution, which represents a severe security risk for enterprise environments. Organizations relying on these backup solutions face significant operational risks including potential data loss, system downtime, and unauthorized access to backup infrastructure. The vulnerability affects the core functionality of backup operations, potentially compromising the integrity of backup processes and making it difficult for administrators to recover from system failures or security incidents. Given that backup systems are often considered critical infrastructure components, the exploitation of this vulnerability could lead to extended service disruptions and increased recovery times. The attack surface is particularly wide since these backup agents are typically deployed across multiple servers and network locations, making the potential impact of exploitation significant for large enterprise environments.
Mitigation strategies for CVE-2006-4128 should focus on immediate patching of affected systems with Symantec's security updates, which address the buffer overflow conditions through proper input validation and memory management. Network segmentation and access controls should be implemented to limit exposure of backup agent services to untrusted networks, following principle of least privilege configurations. The use of network monitoring tools to detect anomalous RPC traffic patterns can help identify potential exploitation attempts. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious RPC message structures. Security teams should conduct thorough vulnerability assessments to identify all instances of affected software across their environments, particularly focusing on backup server configurations and remote agent deployments. The vulnerability aligns with CWE-121 heap-based buffer overflow conditions and represents a potential pathway for attackers to achieve persistent access through the backup infrastructure, which falls under ATT&CK technique T1484.1 for Privilege Escalation through backup and restore operations, making it particularly dangerous for organizations with comprehensive backup and recovery strategies.