CVE-2024-33112 in DIR-845L
Summary
by MITRE • 05/06/2024
D-Link DIR-845L router v1.01KRb03 and before is vulnerable to Command injection via the hnap_main()func.
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Analysis
by VulDB Data Team • 08/06/2024
The D-Link DIR-845L router firmware version 1.01KRb03 and earlier contains a critical command injection vulnerability within the hnap_main() function that exposes the device to remote exploitation. This vulnerability arises from insufficient input validation and sanitization of user-supplied parameters that are directly incorporated into system commands without proper escaping or filtering mechanisms. The issue specifically affects the router's HNAP (Home Network Access Protocol) implementation which serves as a web-based management interface for device configuration and monitoring.
The technical flaw stems from improper handling of HTTP request parameters within the hnap_main() function where attacker-controlled input is concatenated directly into shell commands executed on the device. This represents a classic command injection vulnerability that allows remote attackers to execute arbitrary system commands with the privileges of the web server process, typically running with root or administrative privileges on the router. The vulnerability exists because the firmware fails to implement proper input sanitization, output encoding, or command parameterization techniques that would prevent malicious payloads from being interpreted as commands rather than data.
The operational impact of this vulnerability is severe as it enables attackers to gain complete control over the affected router, potentially leading to unauthorized network access, data exfiltration, or use as a pivot point for attacking other devices within the local network. Attackers could exploit this vulnerability to modify router configurations, establish persistent backdoors, monitor network traffic, or redirect traffic through malicious servers. The vulnerability affects all users running the vulnerable firmware versions and can be exploited remotely without requiring authentication, making it particularly dangerous in environments where routers are exposed to untrusted networks or the internet.
Mitigation strategies should include immediate firmware updates from D-Link to address the command injection flaw, network segmentation to isolate affected devices, and implementation of network monitoring to detect suspicious command execution patterns. Organizations should also consider disabling unnecessary services and ports, implementing web application firewalls to filter malicious requests, and conducting regular security assessments of network infrastructure. This vulnerability aligns with CWE-77 and CWE-88 categories related to command injection and improper input handling, and maps to ATT&CK technique T1059.001 for command and scripting interpreter along with T1021.001 for remote services. The affected devices should be prioritized for immediate remediation as the attack surface extends beyond simple router compromise to encompass entire network infrastructures.