CVE-2020-6785 in BVMS
Summary
by MITRE
Loading a DLL through an Uncontrolled Search Path Element in Bosch BVMS and BVMS Viewer in versions 10.1.0, 10.0.1, 10.0.0 and 9.0.0 and older potentially allows an attacker to execute arbitrary code on a victim's system. This affects both the installer as well as the installed application. This also affects Bosch DIVAR IP 7000 R2, Bosch DIVAR IP all-in-one 5000 and Bosch DIVAR IP all-in-one 7000 with installers and installed BVMS versions prior to BVMS 10.1.1.
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Analysis
by VulDB Data Team • 04/05/2021
This vulnerability represents a critical security flaw in Bosch's video management software ecosystem, specifically affecting the BVMS and BVMS Viewer applications along with related hardware devices. The issue stems from an uncontrolled search path element that allows malicious actors to manipulate the dynamic link library loading process, creating opportunities for privilege escalation and arbitrary code execution. The vulnerability impacts multiple versions of the software including 10.1.0, 10.0.1, 10.0.0, and 9.0.0, as well as older releases, making it particularly concerning given the widespread deployment of these systems in security-critical environments. The attack surface extends beyond just the installed application to include the installer itself, amplifying the potential impact of exploitation.
The technical flaw manifests when the application searches for required dynamic link libraries in a manner that does not properly validate or restrict the search path. This allows an attacker to place a malicious DLL in a location that will be prioritized during the loading process, effectively hijacking the application's execution flow. The vulnerability aligns with CWE-427 Uncontrolled Search Path Element, which specifically addresses situations where applications search for files in directories that may be manipulated by attackers. This weakness enables attackers to execute code with the privileges of the victim user, potentially leading to complete system compromise. The issue affects both the installer and the running application, meaning that even the initial installation phase can be compromised, creating a persistent threat vector.
The operational impact of this vulnerability is severe, particularly in enterprise and industrial security environments where Bosch BVMS systems are commonly deployed. Attackers who successfully exploit this vulnerability can gain unauthorized access to video surveillance systems, potentially allowing them to manipulate security footage, disable monitoring capabilities, or even take control of the entire surveillance infrastructure. The affected hardware platforms including DIVAR IP 7000 R2, DIVAR IP all-in-one 5000, and DIVAR IP all-in-one 7000 represent critical components in security infrastructure, making this vulnerability particularly dangerous from an operational security perspective. The attack could be executed through social engineering, physical access, or other means that allow the attacker to place malicious DLLs in the appropriate directories, with the system automatically loading these components during normal operation.
Mitigation strategies should focus on immediate remediation through official software updates from Bosch, as well as implementing additional security controls to prevent exploitation. Organizations should ensure that all affected systems are updated to BVMS version 10.1.1 or later, which contains the necessary patches to address this vulnerability. Network segmentation and access controls should be implemented to limit the potential attack surface, particularly for systems that are not directly connected to the internet. Additionally, security monitoring should be enhanced to detect unusual DLL loading patterns or unauthorized file modifications in system directories. The vulnerability also highlights the importance of secure coding practices, particularly in avoiding insecure search path configurations as recommended by the ATT&CK framework's techniques for privilege escalation and persistence. System administrators should conduct thorough security audits to identify any potential malicious DLLs that may have been placed in the system directories prior to patching, and implement regular security assessments to prevent similar vulnerabilities from being introduced in future software releases.