CVE-2019-7384 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 value of the fmgpon_loid parameter is used in a system call inside the boa binary. 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 • 08/04/2023
The vulnerability CVE-2019-7384 represents a critical authenticated shell command injection flaw affecting Raisecom ISCOM HT803G series GPON devices. This issue specifically impacts models including HT803G-U, HT803G-W, HT803G-1GE, and HT803G with firmware versions up to ISCOMHT803G-U_2.0.0_140521_R4.1.47.002. The vulnerability stems from improper input validation within the boa binary application, which processes the fmgpon_loid parameter without adequate sanitization. This parameter is subsequently incorporated into a system call, creating an avenue for malicious command execution. The flaw requires an authenticated attacker who already possesses valid credentials to the device, but once exploited, allows for complete system compromise. The vulnerability aligns with CWE-77 and CWE-94, categorizing it as a command injection vulnerability that permits arbitrary code execution through improper handling of user-supplied data. This weakness operates at the intersection of input validation and command execution, making it particularly dangerous as it bypasses normal security controls that would otherwise prevent unauthorized system manipulation.
The technical exploitation of this vulnerability occurs through the manipulation of the fmgpon_loid parameter within the device's web interface or management protocols. When an authenticated user submits a crafted value for this parameter, the boa binary fails to validate or sanitize the input before passing it to a system call. This allows attackers to inject shell commands that execute with the privileges of the boa process, typically running with administrative rights on the device. The injection can potentially lead to complete system compromise, including the ability to modify device configuration, extract sensitive information, install malicious software, or establish persistent access. The vulnerability represents a classic example of unsafe command construction where user input is directly concatenated into system execution calls without proper escaping or filtering mechanisms. This type of vulnerability is particularly concerning in network infrastructure devices where attackers may leverage it to gain unauthorized access to entire network segments or use the compromised device as a pivot point for further attacks.
The operational impact of CVE-2019-7384 extends beyond simple unauthorized access, as it provides attackers with a pathway to establish persistent control over affected GPON devices. Once exploited, the vulnerability enables attackers to modify device configurations, potentially disrupting network services or creating backdoors for future access. The affected devices serve as critical network infrastructure components, making their compromise particularly damaging to network availability and security. Attackers can leverage this vulnerability to conduct reconnaissance, escalate privileges, or use the compromised device as a launching point for attacks against other systems within the network. The vulnerability also exposes sensitive data that may be stored or processed by these devices, including network credentials, configuration information, or operational data. Given that these are GPON devices used in telecommunications environments, the potential for widespread disruption increases significantly, as they often serve as critical points of network access for multiple subscribers or business customers. The vulnerability's presence in firmware versions up to 4.1.47.002 indicates that a substantial number of devices may remain exposed, particularly in environments where firmware updates are infrequent or delayed.
Mitigation strategies for CVE-2019-7384 require immediate action to address the underlying authentication and input validation issues. Organizations should prioritize updating affected devices to firmware versions that contain patches for this vulnerability, as provided by Raisecom or through official security advisories. Network segmentation and access controls should be implemented to limit the ability of unauthorized users to reach these devices, particularly by restricting access to management interfaces. Implementing network monitoring solutions that can detect anomalous command execution patterns or unusual network traffic from these devices may help identify exploitation attempts. The vulnerability demonstrates the critical importance of input validation and proper sanitization of user-supplied data in web applications, aligning with ATT&CK technique T1059.001 for command and script injection. Security teams should also consider implementing device hardening practices, including disabling unnecessary services, enforcing strong authentication mechanisms, and regularly reviewing access controls. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other network infrastructure components. Additionally, organizations should develop incident response procedures specifically addressing compromised network devices, ensuring rapid detection and remediation of exploitation attempts. The vulnerability serves as a reminder of the critical need for proper secure coding practices and the importance of validating all user inputs to prevent injection attacks that can lead to complete system compromise.