CVE-2018-3963 : Security Advisory and Response
Learn about CVE-2018-3963, a critical command injection flaw in CUJO Smart Firewall's DHCP daemon configuration, enabling attackers to execute arbitrary system commands. Find mitigation steps and preventive measures here.
The CUJO Smart Firewall is affected by a critical command injection vulnerability in its DHCP daemon configuration, allowing attackers to execute arbitrary system commands.
Understanding CVE-2018-3963
This CVE involves a security flaw in the CUJO Smart Firewall that enables unauthorized command execution through DHCP manipulation.
What is CVE-2018-3963?
The vulnerability in the CUJO Smart Firewall's DHCP daemon configuration permits attackers to run malicious commands by exploiting the handling of static DHCP address additions.
The Impact of CVE-2018-3963
The critical severity of this vulnerability lies in its potential to compromise confidentiality, integrity, and availability of affected systems, posing a significant threat to network security.
Technical Details of CVE-2018-3963
This section delves into the specifics of the vulnerability.
Vulnerability Description
The flaw arises when inserting hostnames into the dhcpd.conf file without proper sanitization during static DHCP address addition, enabling unauthorized command execution.
Affected Systems and Versions
- Product: CUJO
- Version: CUJO Smart Firewall - Firmware version 7003
Exploitation Mechanism
Attackers can trigger the vulnerability by sending a DHCP request message and creating the corresponding static DHCP entry to execute arbitrary system commands.
Mitigation and Prevention
Protecting systems from CVE-2018-3963 requires immediate action and long-term security measures.
Immediate Steps to Take
- Update CUJO Smart Firewall to a patched version that addresses the command injection vulnerability.
- Monitor network traffic for any suspicious DHCP activities.
Long-Term Security Practices
- Implement network segmentation to limit the impact of potential attacks.
- Regularly audit and review DHCP configurations for any anomalies.
- Educate users on identifying and reporting suspicious network behavior.
Patching and Updates
Apply security patches provided by CUJO to remediate the vulnerability and enhance overall system security.