CVE-2019-1901 Explained : Impact and Mitigation
Learn about CVE-2019-1901, a vulnerability in Cisco Nexus 9000 Series ACI Mode Switch Software that could allow attackers to execute code with root privileges or cause a denial of service situation.
A vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco Nexus 9000 Series ACI Mode Switch Software could allow an attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) situation.
Understanding CVE-2019-1901
This CVE involves a buffer overflow vulnerability in the LLDP subsystem of Cisco Nexus 9000 Series ACI Mode Switch Software.
What is CVE-2019-1901?
The vulnerability stems from improper validation of certain TLV fields in the LLDP frame header, allowing an attacker in close proximity to the device to exploit it by sending a crafted LLDP packet.
The Impact of CVE-2019-1901
If successfully exploited, an attacker could execute arbitrary code with root privileges or trigger a DoS situation on the affected device.
Technical Details of CVE-2019-1901
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The vulnerability lies in the improper validation of TLV fields in the LLDP frame header.
Affected Systems and Versions
- Cisco Nexus 9000 Series Fabric Switches in ACI mode with software versions prior to 13.2(7f) or any 14.x release.
Exploitation Mechanism
- Attacker sends a specifically crafted LLDP packet to the targeted device.
Mitigation and Prevention
Protecting systems from CVE-2019-1901 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-released patches or updates promptly.
- Implement network segmentation to limit the impact of potential attacks.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities.
- Conduct security training for staff to recognize and respond to potential threats.
- Employ intrusion detection and prevention systems to enhance network security.
Patching and Updates
- Cisco has likely released patches or updates to address this vulnerability. Ensure systems are updated to a secure version.