CVE-2019-7746 in jmr1140
Summary
by MITRE
JioFi 4 jmr1140 Amtel_JMR1140_R12.07 devices allow remote attackers to obtain an admin token by making a /cgi-bin/qcmap_auth type=getuser request and then reading the token field. This token value can then be used to change the Wi-Fi password or perform a factory reset.
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Analysis
by VulDB Data Team • 09/15/2023
The CVE-2019-7746 vulnerability affects JioFi 4 jmr1140 devices running Amtel_JMR1140_R12.07 firmware, representing a critical authentication flaw that exposes administrative access to remote attackers. This vulnerability resides in the device's web interface implementation where the /cgi-bin/qcmap_auth endpoint fails to properly validate authentication requests. The flaw allows unauthenticated attackers to exploit a simple GET request mechanism that returns administrative tokens without requiring proper credentials or session validation. This represents a classic case of insufficient authentication controls that directly violates security principle of least privilege and proper access control enforcement.
The technical exploitation of this vulnerability follows a straightforward methodology where attackers can simply craft a request to the /cgi-bin/qcmap_auth endpoint with type=getuser parameter to retrieve administrative tokens. This approach demonstrates a fundamental flaw in the device's API design where sensitive administrative functions are exposed without proper authentication mechanisms. The vulnerability specifically targets the authentication token generation process, which is typically expected to be protected through secure session management or proper credential verification before token issuance. This weakness creates a direct path for attackers to escalate privileges and gain full administrative control over the device's configuration.
The operational impact of this vulnerability is severe and far-reaching, as the obtained administrative token grants attackers complete control over the device's functionality. Attackers can modify critical network parameters including Wi-Fi passwords, perform factory resets, and potentially access other administrative functions that may be available through the same interface. The ability to change Wi-Fi passwords directly impacts network security and can lead to unauthorized access to connected devices. Additionally, the factory reset capability provides attackers with a means to completely compromise the device's configuration and potentially cause service disruption. This vulnerability effectively transforms a consumer-grade device into a potential attack vector that can be leveraged for network infiltration or denial of service attacks.
This vulnerability aligns with CWE-305 authentication weakness and represents a specific implementation of improper authentication mechanisms that violate the principle of secure authentication design. The issue also maps to ATT&CK technique T1078 which covers valid accounts and T1490 which covers endpoint denial of service. Organizations should immediately implement network segmentation to isolate affected devices, deploy network monitoring to detect unusual authentication requests, and ensure firmware updates are applied to address the vulnerability. The device manufacturer should be notified to provide a security patch that properly validates authentication requests and implements proper token management mechanisms to prevent unauthorized access to administrative functions.