CVE-2017-8770 in WiFI Repeater
Summary
by MITRE
There is LFD (local file disclosure) on BE126 WIFI repeater 1.0 devices that allows attackers to read the entire filesystem on the device via a crafted getpage parameter.
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Analysis
by VulDB Data Team • 09/25/2024
The vulnerability identified as CVE-2017-8770 represents a critical local file disclosure flaw affecting BE126 WIFI repeater version 1.0 devices. This vulnerability stems from insufficient input validation within the device's web interface handling mechanism, specifically in how the system processes the getpage parameter. The flaw allows remote attackers to exploit a path traversal vulnerability that enables them to access and retrieve arbitrary files from the device's filesystem without proper authentication or authorization.
The technical implementation of this vulnerability falls under CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The affected device fails to properly sanitize user-supplied input when processing the getpage parameter, allowing attackers to craft malicious requests that bypass normal file access controls. This weakness enables attackers to navigate through the device's file system hierarchy and retrieve sensitive information including configuration files, system binaries, and potentially credential storage locations.
From an operational security perspective, this vulnerability presents a severe risk to network infrastructure devices deployed in both residential and enterprise environments. The ability to read the entire filesystem means attackers can potentially access device configuration data, network credentials, and other sensitive information that could be used for further attacks. The vulnerability is particularly concerning because it affects wireless networking equipment that often serves as a gateway to larger network infrastructures, providing attackers with potential entry points for lateral movement and privilege escalation attacks.
The impact of this vulnerability extends beyond simple information disclosure, as it can be leveraged as a stepping stone for more sophisticated attacks. Attackers may use the retrieved information to understand the device's operational configuration, identify potential network topology details, or discover other vulnerabilities within the same device or connected systems. This type of attack aligns with ATT&CK technique T1083, which covers discovery of file and directory permissions, and T1005, which involves data from local system storage.
Mitigation strategies for CVE-2017-8770 should include immediate firmware updates from the vendor to address the input validation flaw, network segmentation to limit access to these devices, and implementing proper access controls and monitoring for suspicious file access patterns. Organizations should also consider disabling unnecessary web interfaces on network devices and applying network-level controls to prevent unauthorized access to these vulnerable systems. The vulnerability demonstrates the critical importance of proper input validation and access control mechanisms in embedded network devices, particularly those handling user-supplied parameters in web-based interfaces.