CVE-2009-3448 in NetVault
Summary
by MITRE
npvmgr.exe in BakBone NetVault Backup 8.22 Build 29 allows remote attackers to cause a denial of service (daemon crash) via a packet to (1) TCP or (2) UDP port 20031 with a large value in an unspecified size field, which is not properly handled in a malloc operation. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 01/22/2019
The vulnerability identified as CVE-2009-3448 affects BakBone NetVault Backup version 8.22 Build 29 through the npvmgr.exe daemon process. This issue represents a classic buffer overflow condition that manifests as a denial of service attack, where remote adversaries can trigger system instability by sending malformed network packets to specific ports. The vulnerability specifically targets TCP and UDP port 20031, which serves as the communication endpoint for the NetVault backup management service. The flaw occurs when the application receives a packet containing an oversized value in an unspecified size field, which then gets processed through a malloc operation without proper validation or bounds checking.
From a technical perspective, this vulnerability falls under the category of improper input validation and memory management errors, aligning with CWE-121, which describes stack-based buffer overflow conditions. The npvmgr.exe daemon fails to properly validate the size field in incoming packets, allowing an attacker to specify a value that exceeds the allocated memory boundaries during the malloc operation. This memory allocation error results in heap corruption and ultimately causes the daemon process to crash, effectively rendering the backup management service unavailable to legitimate users. The vulnerability demonstrates poor defensive programming practices where input data from untrusted network sources is not adequately sanitized before being used in memory allocation operations.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise backup operations within enterprise environments that rely on BakBone NetVault systems. Organizations using this backup solution may experience unexpected downtime during critical backup windows, potentially leading to data protection gaps and operational disruptions. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the network without requiring local system access, making it particularly dangerous for systems that are exposed to external networks or have insufficient network segmentation. This vulnerability directly impacts the availability aspect of the CIA triad and can be classified under ATT&CK technique T1499.004 for network denial of service attacks.
Mitigation strategies for this vulnerability should include immediate patching of the affected BakBone NetVault Backup software to version 8.22 Build 30 or later, which contains the necessary fixes for the memory allocation handling. Network administrators should implement firewall rules to restrict access to port 20031, limiting exposure to trusted networks only and preventing unauthorized access from external sources. Additionally, monitoring should be implemented to detect unusual traffic patterns or malformed packets targeting this specific port, as part of a broader network security monitoring approach. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious network activity targeting known vulnerable services, helping to detect exploitation attempts before they succeed. The vulnerability highlights the importance of proper input validation and memory management practices in network services, emphasizing the need for defensive coding techniques and regular security assessments of critical backup infrastructure components.