CVE-2020-6777 in PRAESIDEO
Summary
by MITRE • 01/14/2021
A vulnerability in the web-based management interface of Bosch PRAESIDEO until and including version 4.41 and Bosch PRAESENSA until and including version 1.10 allows an authenticated remote attacker with admin privileges to mount a stored Cross-Site-Scripting (XSS) attack against another user. When the victim logs into the management interface, the stored script code is executed in the context of his browser. A successful exploit would allow an attacker to interact with the management interface with the privileges of the victim. However, as the attacker already needs admin privileges, there is no additional impact on the management interface itself.
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Analysis
by VulDB Data Team • 02/14/2021
This vulnerability exists within the web-based management interface of Bosch PRAESIDEO and PRAESENSA security systems, specifically affecting versions up to and including 4.41 and 1.10 respectively. The flaw represents a stored cross-site scripting vulnerability that enables authenticated attackers with administrative privileges to inject malicious script code into the system's interface. The vulnerability stems from inadequate input validation and output encoding mechanisms within the web application's user interface components. When a victim administrator logs into the management interface, the malicious script code that was previously stored in the system executes within the victim's browser context, creating a persistent threat vector that can affect any user who accesses the compromised interface. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications.
The operational impact of this vulnerability is significant despite the requirement for existing administrative access. While the attacker must already possess admin privileges to exploit the vulnerability, the stored XSS attack allows for persistent malicious activity that can be executed against any administrator who logs into the system. The attack enables the attacker to interact with the management interface using the victim's privileges, potentially allowing for data manipulation, configuration changes, or unauthorized access to sensitive system information. The stored nature of the vulnerability means that the malicious payload remains active even after the initial injection, continuously affecting any user who accesses the compromised interface. This persistent threat vector can be particularly dangerous in environments where multiple administrators regularly access the system, as it creates a continuous risk of unauthorized actions.
The exploitation of this vulnerability aligns with ATT&CK technique T1059.007 which covers script execution through web shells and malicious scripts. The attack chain begins with an authenticated administrative user injecting malicious JavaScript code into the web interface, which then executes automatically when other administrators access the system. This creates a sophisticated attack vector that can bypass traditional security measures and maintain persistence within the environment. Organizations should implement comprehensive input validation mechanisms and output encoding to prevent script injection attacks. Regular security updates and patch management are crucial for addressing such vulnerabilities in industrial security systems. The vulnerability highlights the importance of securing web-based management interfaces in critical infrastructure environments where administrative access is required for system operation. Additionally, implementing proper access controls and monitoring for unusual administrative activities can help detect potential exploitation attempts. The affected systems should be updated to versions that address this specific XSS vulnerability through proper code validation and sanitization techniques.