CVE-2007-3911 in NetVault Reporter
Summary
by MITRE
Multiple heap-based buffer overflows in (1) clsscheduler.exe (aka scheduler client) and (2) srvscheduler.exe (aka scheduler server) in BakBone NetVault Reporter 3.5 before Update4 allow remote attackers to execute arbitrary code via long filename arguments in HTTP requests.
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Analysis
by VulDB Data Team • 07/22/2019
The vulnerability identified as CVE-2007-3911 represents a critical security flaw in BakBone NetVault Reporter 3.5 before Update4 affecting both client and server components of the backup and recovery solution. This issue manifests as heap-based buffer overflows in two distinct executables: clsscheduler.exe (the scheduler client) and srvscheduler.exe (the scheduler server). The vulnerability arises from inadequate input validation mechanisms within these components, specifically when processing HTTP requests containing excessively long filename arguments. The flaw enables remote attackers to exploit the buffer overflow conditions and execute arbitrary code on the affected systems, potentially compromising the entire backup infrastructure.
The technical implementation of this vulnerability stems from improper bounds checking in the handling of user-supplied data within the HTTP request processing pipeline. When the scheduler components receive HTTP requests containing filename arguments exceeding the allocated buffer size, memory corruption occurs in the heap memory region. This heap-based buffer overflow creates opportunities for attackers to overwrite adjacent memory locations, potentially corrupting program execution flow and allowing code injection attacks. The vulnerability is particularly dangerous because it affects both client and server components, enabling attackers to compromise either endpoint in the backup infrastructure. According to CWE classification, this represents a heap-based buffer overflow vulnerability (CWE-119) with potential for privilege escalation and remote code execution. The ATT&CK framework categorizes this as a remote code execution technique (T1059.007) that leverages application vulnerabilities to gain unauthorized system access.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it fundamentally compromises the integrity and availability of backup operations within the NetVault environment. Attackers exploiting this vulnerability could potentially gain unauthorized access to backup data, disrupt scheduled backup operations, or use the compromised systems as launch points for further attacks within the network infrastructure. The distributed nature of the vulnerability means that both client and server components are at risk, potentially leading to complete system compromise of the backup infrastructure. Organizations using BakBone NetVault Reporter 3.5 before Update4 face significant risk of unauthorized data access, backup data corruption, and potential lateral movement within their network environments. The vulnerability's remote exploitability makes it particularly dangerous as it does not require physical access or local privileges to exploit.
Mitigation strategies for CVE-2007-3911 should prioritize immediate deployment of BakBone's official Update4 patch, which addresses the buffer overflow conditions in both affected executables. Network segmentation and firewall rules should be implemented to restrict access to the scheduler components from untrusted networks, limiting potential attack vectors. Input validation controls should be enhanced at the application level to prevent overly long filename arguments from being processed, while also implementing proper error handling and memory management practices. Security monitoring should be enhanced to detect unusual HTTP request patterns that might indicate exploitation attempts, particularly focusing on malformed filename arguments. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious network traffic targeting the affected components. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other backup and infrastructure management tools within the environment, as this vulnerability demonstrates the importance of proper input validation in enterprise backup solutions. The remediation process should include thorough testing of the update to ensure that it does not introduce compatibility issues with existing backup operations or configurations.