CVE-2024-11063 in DSL6740C
Summary
by MITRE • 11/11/2024
The D-Link DSL6740C modem has an OS Command Injection vulnerability, allowing remote attackers with administrator privileges to inject and execute arbitrary system commands through a specific functionality provided by SSH and Telnet.
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Analysis
by VulDB Data Team • 11/11/2024
The CVE-2024-11063 vulnerability represents a critical operating system command injection flaw within the D-Link DSL6740C broadband modem firmware. This vulnerability exists in the modem's remote administration interfaces, specifically through SSH and Telnet protocols that are commonly enabled for network management purposes. The flaw allows authenticated attackers with administrative credentials to inject malicious commands that are then executed within the underlying operating system context. Such command injection vulnerabilities are particularly dangerous because they can enable attackers to gain complete control over the affected device, potentially leading to unauthorized access to the entire network infrastructure that the modem protects.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the modem's web administration interface and remote access services. When administrators or attackers submit commands through SSH or Telnet sessions, the system fails to properly sanitize user inputs before executing them within the operating system shell. This lack of proper input validation creates a direct path for command injection attacks, where malicious payloads can be constructed to bypass normal access controls and execute arbitrary system commands. The vulnerability specifically affects the modem's handling of user-supplied parameters that are passed directly to system-level commands without adequate filtering or escaping mechanisms.
From an operational perspective, the impact of CVE-2024-11063 extends far beyond simple unauthorized access to a single device. Once exploited, attackers can leverage this vulnerability to perform a wide range of malicious activities including but not limited to network reconnaissance, data exfiltration, establishing persistent backdoors, and using the compromised modem as a pivot point for attacking other devices within the local network. The vulnerability's remote exploitation capability means that attackers do not require physical access to the device, making it particularly concerning for enterprise and home network environments where such modems are commonly deployed. The presence of SSH and Telnet services further amplifies the risk as these protocols are often enabled by default in many network devices, providing multiple potential attack vectors for exploitation.
Security mitigation strategies for this vulnerability should focus on immediate firmware updates from D-Link to address the underlying command injection flaw. Network administrators should also implement strict access controls limiting administrative privileges to only essential personnel and enforce strong authentication mechanisms including multi-factor authentication where possible. The remediation process should include disabling unnecessary remote management services such as SSH and Telnet if they are not required for operations, while ensuring that any remaining administrative access points are properly secured with strong passwords and regular credential rotation policies. Additionally, network segmentation and monitoring should be implemented to detect and prevent unauthorized access attempts, with intrusion detection systems configured to alert on suspicious command execution patterns that may indicate exploitation attempts. This vulnerability aligns with CWE-77 and CWE-88 categories related to command injection flaws and improper neutralization of special elements used in OS commands, respectively, and corresponds to ATT&CK techniques involving command and control through remote access services and privilege escalation through administrative access.