CVE-2019-16018 : Security Advisory and Response
Learn about CVE-2019-16018, a vulnerability in Cisco IOS XR Software allowing remote attackers to trigger a denial of service (DoS) attack by manipulating BGP EVPN attributes.
A vulnerability in Cisco IOS XR Software's implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality could lead to a denial of service (DoS) attack. Attackers could exploit this flaw by sending specially crafted BGP EVPN update messages to the affected system, causing the BGP process to restart unexpectedly.
Understanding CVE-2019-16018
This CVE involves a flaw in the BGP EVPN functionality of Cisco IOS XR Software, potentially enabling remote attackers to trigger a DoS situation.
What is CVE-2019-16018?
The vulnerability in Cisco IOS XR Software allows unauthenticated remote attackers to disrupt the system by manipulating BGP EVPN attributes.
The Impact of CVE-2019-16018
The vulnerability could result in a denial of service (DoS) situation, affecting the availability of the system.
Technical Details of CVE-2019-16018
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The flaw arises from the incorrect handling of BGP update messages containing manipulated EVPN attributes.
Affected Systems and Versions
- Product: Cisco IOS XR Software
- Vendor: Cisco
- Version: Unspecified
Exploitation Mechanism
- Attack Complexity: Low
- Attack Vector: Network
- Availability Impact: High
- Base Score: 7.4 (High)
- User Interaction: Required
- Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Mitigation and Prevention
Protecting systems from CVE-2019-16018 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Monitor for security advisories from Cisco regarding patches or workarounds.
- Implement network segmentation to limit the impact of potential attacks.
- Ensure that BGP traffic is only accepted from trusted sources.
Long-Term Security Practices
- Regularly update and patch Cisco IOS XR Software to address known vulnerabilities.
- Conduct security assessments and audits to identify and mitigate potential risks.
Patching and Updates
- Apply patches provided by Cisco to address the vulnerability in Cisco IOS XR Software.