CVE-2018-6830 in C1 Lite
Summary
by MITRE
Directory traversal vulnerability in Foscam Cameras C1 Lite V3, and C1 V3 with firmware 2.82.2.33 and earlier, FI9800P V3, FI9803P V4, FI9851P V3, and FI9853EP V2 2.84.2.33 and earlier, FI9816P V3, FI9821EP V2, FI9821P V3, FI9826P V3, and FI9831P V3 2.81.2.33 and earlier, C1, C1 V2, C1 Lite, and C1 Lite V2 2.52.2.47 and earlier, FI9800P, FI9800P V2, FI9803P V2, FI9803P V3, and FI9851P V2 2.54.2.47 and earlier, FI9815P, FI9815P V2, FI9816P, and FI9816P V2, 2.51.2.47 and earlier, R2 and R4 2.71.1.59 and earlier, C2 and FI9961EP 2.72.1.59 and earlier, FI9900EP, FI9900P, and FI9901EP 2.74.1.59 and earlier, FI9928P 2.74.1.58 and earlier, FI9803EP and FI9853EP 2.22.2.31 and earlier, FI9803P and FI9851P 2.24.2.31 and earlier, FI9821P V2, FI9826P V2, FI9831P V2, and FI9821EP 2.21.2.31 and earlier, FI9821W V2, FI9831W, FI9826W, FI9821P, FI9831P, and FI9826P 2.11.1.120 and earlier, FI9818W V2 2.13.2.120 and earlier, FI9805W, FI9804W, FI9804P, FI9805E, and FI9805P 2.14.1.120 and earlier, FI9828P, and FI9828W 2.13.1.120 and earlier, and FI9828P V2 2.11.1.133 and earlier allows remote attackers to delete arbitrary files via a .. (dot dot) in the URI path component.
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Analysis
by VulDB Data Team • 03/03/2020
This directory traversal vulnerability exists in multiple Foscam camera models and firmware versions, representing a critical security flaw that enables remote attackers to manipulate file system operations through crafted URI paths. The vulnerability specifically affects cameras running firmware versions up to and including the listed releases, creating a widespread risk across numerous device categories including C1, FI9800P, FI9816P, R2, C2, and various other models. The flaw manifests when the system processes URI path components containing .. (dot dot) sequences, allowing unauthorized file deletion operations.
The technical implementation of this vulnerability stems from insufficient input validation and path sanitization within the camera's web server component. When processing HTTP requests containing directory traversal sequences, the system fails to properly validate or sanitize the URI path, enabling attackers to navigate beyond the intended file system boundaries. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability allows attackers to construct malicious requests that can delete arbitrary files on the device's file system, potentially compromising the camera's operational integrity and security posture.
The operational impact of this vulnerability extends beyond simple file deletion, as it represents a fundamental breakdown in the device's security model and access controls. Remote attackers can exploit this flaw to delete critical system files, configuration data, or even firmware components, potentially rendering the camera inoperable or creating persistent security weaknesses. The vulnerability affects a broad range of Foscam devices spanning multiple generations and firmware versions, indicating a systemic issue in the software implementation rather than an isolated incident. This widespread exposure across various camera models suggests that the underlying security flaw exists in core components shared across the product line, making the attack surface particularly expansive.
The implications of this vulnerability align with ATT&CK technique T1211, which covers the exploitation of vulnerabilities in software to gain unauthorized access or manipulate system resources. Attackers could leverage this weakness to not only delete files but potentially execute arbitrary code or escalate privileges within the device's operating environment. The vulnerability's remote nature means that attackers do not require physical access or network credentials to exploit it, making it particularly dangerous for security-conscious deployments. Organizations using these cameras should consider the broader implications of this flaw, as it could enable attackers to establish persistent access points or disrupt critical surveillance operations.
Mitigation strategies should include immediate firmware updates from Foscam to address the directory traversal vulnerability, as well as network segmentation to limit exposure of these devices to untrusted networks. Implementing web application firewalls or network access controls that filter out suspicious URI patterns containing directory traversal sequences can provide additional protection layers. Security monitoring should focus on detecting unusual file system activity or access patterns that might indicate exploitation attempts. Device administrators should also consider disabling unnecessary web services or features that might expose additional attack vectors, while maintaining regular inventory tracking of all connected camera devices to ensure comprehensive vulnerability management across the entire surveillance infrastructure.