CVE-2019-7385 in ISCOM HT803G-U
Summary
by MITRE
An authenticated shell command injection issue has been discovered in Raisecom ISCOM HT803G-U, HT803G-W, HT803G-1GE, and HT803G GPON products with the firmware version ISCOMHT803G-U_2.0.0_140521_R4.1.47.002 or below, The values of the newpass and confpass parameters in /bin/WebMGR are used in a system call in the firmware. Because there is no user input validation, this leads to authenticated code execution on the device.
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Analysis
by VulDB Data Team • 10/04/2024
The vulnerability identified as CVE-2019-7385 represents a critical authenticated command injection flaw affecting Raisecom ISCOM HT803G series GPON devices. This issue resides within the web management interface of these telecommunications equipment models, specifically in the handling of password change functionality. The vulnerability stems from improper input validation mechanisms within the firmware's WebMGR component, which processes user-supplied values for newpass and confpass parameters without adequate sanitization or validation checks.
The technical exploitation of this vulnerability occurs through the manipulation of the password change form where the system call in /bin/WebMGR directly incorporates user input from the newpass and confpass parameters. This lack of input validation creates a classic command injection scenario where maliciously crafted input can be executed as shell commands with the privileges of the web server process. The vulnerability is authenticated, meaning an attacker must first establish valid credentials to the device, but once authenticated, they can leverage this flaw to execute arbitrary code on the affected system. This represents a significant security risk as it allows for complete system compromise and potential lateral movement within network environments where these devices are deployed.
The operational impact of CVE-2019-7385 extends beyond simple code execution to encompass full system control and potential network disruption. An attacker with valid credentials could manipulate the device to execute malicious commands, potentially leading to data exfiltration, service disruption, or the establishment of persistent backdoors. The vulnerability affects multiple models within the HT803G series, amplifying its potential impact across various network deployments. The affected firmware versions ISCOMHT803G-U_2.0.0_140521_R4.1.47.002 and below represent a substantial portion of deployed devices that remain vulnerable to this attack vector, making it a prime target for exploitation in network security incidents.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and maps to several ATT&CK techniques including T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation. The authentication requirement does not mitigate the severity of this flaw, as it represents a privilege escalation vulnerability within an already compromised session. Organizations should implement immediate mitigations including firmware updates from the vendor, network segmentation to limit access to these devices, and monitoring for suspicious authentication patterns or command execution attempts. The vulnerability underscores the critical importance of input validation in embedded systems and web applications, particularly in network infrastructure devices where the impact of compromise can extend beyond individual devices to entire network segments.