CVE-2018-16946 in LNB
Summary
by MITRE
LG LNB*, LND*, LNU*, and LNV* smart network camera devices have broken access control. Attackers are able to download /updownload/t.report (aka Log & Report) files and download backup files (via download.php) without authenticating. These backup files contain user credentials and configuration information for the camera device. An attacker is able to discover the backup filename via reading the system logs or report data, or just by brute-forcing the backup filename pattern. It may be possible to authenticate to the admin account with the admin password.
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Analysis
by VulDB Data Team • 09/04/2024
The vulnerability identified as CVE-2018-16946 affects a range of LG smart network camera devices including models LNB, LND, LNU, and LNV. This represents a critical access control flaw that fundamentally undermines the security posture of these networked devices. The issue stems from improper authentication mechanisms that allow unauthorized users to access sensitive system files without providing valid credentials. The vulnerability is classified under CWE-284 which specifically addresses improper access control, making it a direct violation of fundamental security principles that should be implemented in all networked devices. The affected devices are particularly concerning because they store and transmit sensitive information related to network configurations and user credentials, creating a significant attack surface for malicious actors.
The technical exploitation of this vulnerability involves two primary attack vectors that demonstrate the severity of the access control failure. First, attackers can directly download log and report files located at /updownload/t.report without authentication, which provides valuable information about the system's operation and potentially reveals system configuration details. Second, the vulnerability allows unauthorized access to backup files through the download.php endpoint, which contains complete system backups including user credentials and configuration parameters. These backup files are particularly dangerous because they often contain administrative passwords and network settings that enable full system compromise. The attack surface is further expanded by the fact that backup filenames can be discovered through system log analysis, report data examination, or through simple brute-force techniques targeting predictable naming conventions.
The operational impact of this vulnerability extends beyond simple unauthorized access to represent a comprehensive compromise of device security. When attackers obtain backup files containing administrative credentials, they gain the ability to fully control the affected camera devices, potentially enabling them to modify configurations, disable security features, or establish persistent access points. The vulnerability also enables reconnaissance activities where attackers can gather detailed information about the network infrastructure, device models, and system configurations. This information can then be leveraged for further attacks within the network environment, potentially leading to lateral movement and broader security breaches. The fact that authentication is bypassed entirely for critical system files violates fundamental security principles and creates opportunities for attackers to conduct persistent surveillance operations or disrupt network services.
Mitigation strategies for CVE-2018-16946 should focus on immediate access control enforcement and system hardening measures. Organizations must implement proper authentication mechanisms that prevent unauthorized access to system files and backup data. Network segmentation should be employed to isolate these devices from critical network segments, reducing the potential impact of successful exploitation. Regular firmware updates should be applied to address the underlying access control vulnerabilities, with particular attention to ensuring that all affected LG camera models receive appropriate security patches. The implementation of network monitoring solutions can help detect unauthorized access attempts to system files, while also providing early warning of potential exploitation activities. Additionally, administrative credentials should be changed immediately upon discovery of the vulnerability, and access to backup files should be restricted through proper file permissions and authentication controls. This vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and T1005 which covers data from local system, demonstrating how improper access control can enable both credential theft and data exfiltration.