CVE-2005-2389 in NetBackup
Summary
by MITRE
NDMP server in Veritas NetBackup 5.1 allows attackers to cause a denial of service via a CONFIG message with an out-of-range timestamp, which triggers a null dereference.
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Analysis
by VulDB Data Team • 07/03/2019
The vulnerability identified as CVE-2005-2389 affects the Network Data Management Protocol server component within Veritas NetBackup version 5.1, representing a critical denial of service weakness that can be exploited by remote attackers to disrupt network backup operations. This issue stems from inadequate input validation within the NDMP server implementation, specifically when processing CONFIG messages that contain malformed timestamp values. The flaw manifests when the server encounters a timestamp value that falls outside the acceptable range, causing the application to attempt to dereference a null pointer during message processing. This null pointer dereference results in an immediate application crash and subsequent service disruption, effectively rendering the backup server unavailable to legitimate users and potentially compromising data protection operations.
From a technical perspective, this vulnerability represents a classic null pointer dereference issue that falls under CWE-476, which specifically addresses the use of null pointers in software applications. The vulnerability exists within the NDMP protocol implementation where the server fails to properly validate timestamp parameters before attempting to process them, creating an execution path that leads to memory access violations. The attack vector is particularly concerning as it requires only a single malformed CONFIG message to be sent to the target server, making it easily exploitable by attackers with network access to the backup infrastructure. The flaw demonstrates poor defensive programming practices where input validation is insufficient to handle edge cases, particularly when dealing with timestamp values that may exceed expected boundaries or contain invalid data formats.
The operational impact of CVE-2005-2389 extends beyond simple service disruption, as it directly affects the availability of critical backup infrastructure that organizations rely upon for data recovery and business continuity. When the NDMP server crashes due to this vulnerability, it can lead to extended downtime for backup operations, potentially leaving systems vulnerable to data loss during critical backup windows. Organizations using Veritas NetBackup 5.1 may experience cascading effects where backup jobs fail to complete, backup schedules are disrupted, and recovery operations become unavailable when needed most. The vulnerability also creates opportunities for attackers to perform persistent denial of service attacks by repeatedly sending malformed CONFIG messages, potentially causing the backup server to continuously restart and consume system resources.
Security practitioners should consider this vulnerability in the context of the broader ATT&CK framework, particularly under the T1499.004 technique for "Network Denial of Service" and T1566.002 for "Phishing via Service" when considering potential attack scenarios. The vulnerability aligns with the principle of least privilege violations where network services should not be susceptible to crashes from malformed input, and it represents a failure in the application's robustness against adversarial input. Organizations should implement immediate mitigations including applying the vendor-provided patches for Veritas NetBackup 5.1, configuring network access controls to restrict NDMP server access to trusted sources, and implementing monitoring solutions to detect unusual patterns of CONFIG message traffic. Additionally, network segmentation and firewall rules should be enforced to limit exposure of NDMP server components to unnecessary network access, while regular security assessments should verify that similar input validation issues do not exist in other components of the backup infrastructure. The vulnerability underscores the importance of input validation and defensive programming practices in mission-critical systems where service availability directly impacts organizational operations and data protection strategies.