CVE-2024-41887 in XRN-420S
Summary
by MITRE • 12/24/2024
Team ENVY, a Security Research TEAM has found a flaw that allows for a remote code execution on the NVR. An attacker can create an NVR log file in a directory one level higher on the system, which can be used to corrupt files in the directory. The manufacturer has released patch firmware for the flaw, please refer to the manufacturer's report for details and workarounds.
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Analysis
by VulDB Data Team • 12/24/2024
The vulnerability identified as CVE-2024-41887 represents a critical remote code execution flaw within Network Video Recorder (NVR) systems, specifically affecting Team ENVY's security research findings. This vulnerability stems from improper input validation and inadequate file system access controls within the NVR's logging mechanism, creating a path for malicious actors to manipulate the system's file structure through crafted log file creation. The flaw exists in the way the NVR processes and stores log files, allowing an attacker to exploit directory traversal techniques that enable them to place malicious files in parent directories relative to the intended logging location. This type of vulnerability falls under CWE-22, Directory Traversal, which is classified as a common weakness in software design that allows attackers to access files and directories outside the intended scope.
The technical exploitation of this vulnerability requires an attacker to leverage the NVR's logging functionality to create a specially crafted log file that bypasses normal directory access controls. When the system processes this malicious log entry, it inadvertently allows file creation in parent directories, potentially leading to arbitrary code execution through the corruption or replacement of critical system files. The flaw demonstrates a lack of proper path validation and access control mechanisms within the NVR's file handling routines, creating an attack surface that aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as the attacker can potentially execute commands through manipulated log files that are subsequently processed by the system. The vulnerability's impact extends beyond simple file corruption, as it can enable attackers to escalate privileges and gain persistent access to the NVR system.
The operational impact of CVE-2024-41887 is severe for organizations relying on NVR systems for security monitoring and surveillance operations. An attacker who successfully exploits this vulnerability can compromise the integrity of the entire video surveillance infrastructure, potentially leading to complete system takeover. The remote code execution capability means that attackers can operate from outside the network perimeter without requiring physical access to the devices, making the attack surface significantly larger. This vulnerability directly affects the availability, integrity, and confidentiality of security monitoring data, as attackers can not only access recorded footage but also potentially disable or manipulate the surveillance system entirely. Organizations using affected NVR systems face risks of data breaches, unauthorized access to sensitive surveillance information, and potential disruption of critical security operations. The vulnerability's classification as a remote code execution flaw places it within the high-risk category of cybersecurity threats that can result in significant financial and operational damage.
Mitigation strategies for CVE-2024-41887 should prioritize immediate implementation of the manufacturer-provided firmware patches, which address the root cause by implementing proper input validation and access control measures. Network segmentation and firewall rules should be configured to restrict access to NVR systems from untrusted networks, limiting potential attack vectors and reducing the likelihood of exploitation. Regular security audits and monitoring of log file creation activities can help detect anomalous behavior that might indicate attempted exploitation of this vulnerability. Organizations should also implement network intrusion detection systems that can identify suspicious directory traversal attempts and log file manipulation activities. The remediation process should include comprehensive testing of the patched firmware to ensure that the vulnerability is fully resolved without introducing new issues. Additionally, security teams should conduct regular vulnerability assessments of their NVR systems and maintain updated security baselines that include proper access controls and monitoring procedures to prevent similar vulnerabilities from emerging in the future.