CVE-2019-18396 in TD5130v2
Summary
by MITRE
An issue was discovered in certain Oi third-party firmware that may be installed on Technicolor TD5130v2 devices. A Command Injection in the Ping module in the Web Interface in OI_Fw_V20 allows remote attackers to execute arbitrary OS commands in the pingAddr parameter to mnt_ping.cgi. NOTE: This may overlap CVE-2017?14127.
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Analysis
by VulDB Data Team • 10/13/2024
This vulnerability resides within the Technicolor TD5130v2 router firmware, specifically in the Oi third-party firmware version 20. The issue manifests as a command injection flaw in the web interface's ping module, which processes user input through the mnt_ping.cgi endpoint. The vulnerability is particularly concerning because it allows remote attackers to execute arbitrary operating system commands by manipulating the pingAddr parameter, effectively providing unauthorized access to the underlying system shell.
The technical implementation of this vulnerability follows the classic command injection pattern where user-controllable input is directly incorporated into system commands without proper sanitization or validation. When an attacker submits malicious input through the pingAddr parameter, the firmware fails to properly escape or filter special characters that could alter the intended command execution flow. This creates an opportunity for attackers to append additional commands that will be executed with the privileges of the web server process, typically running with elevated system permissions.
From an operational impact perspective, this vulnerability represents a critical security risk for affected devices as it enables complete system compromise from a remote location. Attackers can leverage this flaw to gain persistent access to the network infrastructure, potentially leading to data exfiltration, network reconnaissance, or lateral movement within the compromised network. The vulnerability affects not just individual devices but entire networks that rely on these routers for connectivity, as compromised devices can serve as entry points for broader attacks. This aligns with ATT&CK technique T1219 which describes the use of remote access tools and command execution capabilities to maintain access to compromised systems.
The vulnerability's classification as a command injection flaw places it under CWE-77, which specifically addresses situations where user-supplied data is directly passed to system commands without proper validation or sanitization. This weakness is particularly dangerous in network appliances where the web interface serves as the primary attack surface for remote exploitation. The fact that this vulnerability exists in third-party firmware rather than official manufacturer code suggests a broader issue with software supply chain security and the importance of validating third-party components before deployment.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from Technicolor or Oi to address the command injection flaw. Network administrators should also implement network segmentation to limit the potential impact of compromised devices and deploy intrusion detection systems to monitor for suspicious ping command patterns. Additionally, the principle of least privilege should be applied by ensuring that web interfaces only accept validated input and that system commands are executed through secure, parameterized interfaces rather than direct command concatenation. The overlap with CVE-2017-14127 suggests that similar patterns may exist in other firmware components, warranting comprehensive security assessments of the entire firmware codebase to identify and remediate additional command injection vulnerabilities.