CVE-2019-0001 Explained : Impact and Mitigation
Learn about CVE-2019-0001 affecting Junos OS on MX Series devices. Understand the impact, affected versions, and mitigation steps. Update to secure versions to prevent service crashes.
An issue can occur on MX Series devices with dynamic VLAN configuration, triggering an uncontrolled recursion loop in the Broadband Edge subscriber management daemon (bbe-smgd), potentially leading to high CPU usage and service crashes.
Understanding CVE-2019-0001
This CVE involves a vulnerability in Junos OS affecting MX Series devices, potentially causing denial of service due to uncontrolled recursion.
What is CVE-2019-0001?
- Receipt of malformed packets on MX Series devices with dynamic VLAN configuration can trigger uncontrolled recursion in bbe-smgd.
- Affected Junos OS versions include 16.1 to 18.2.
The Impact of CVE-2019-0001
- CVSS Base Score: 7.5 (High)
- Attack Vector: Network
- Availability Impact: High
- No malicious exploitation reported by Juniper SIRT.
Technical Details of CVE-2019-0001
This section provides detailed technical information about the vulnerability.
Vulnerability Description
- Malformed packets can lead to uncontrolled recursion in bbe-smgd, causing high CPU usage and service crashes.
Affected Systems and Versions
- Platforms: MX Series
- Products: Junos OS
- Versions: 16.1 to 18.2
Exploitation Mechanism
- Low attack complexity
- No privileges required
- No user interaction needed
- Scope remains unchanged
Mitigation and Prevention
Learn how to mitigate and prevent the CVE-2019-0001 vulnerability.
Immediate Steps to Take
- Update Junos OS to the fixed versions: 16.1R7-S1, 16.2R2-S7, 17.1R2-S10, 17.1R3, 17.2R3, 17.3R3-S1, 17.4R2, 18.1R3, 18.2R2, 18.3R1, or later.
Long-Term Security Practices
- Regularly monitor and update network devices.
- Implement proper VLAN configurations and security measures.
Patching and Updates
- Ensure all affected devices are patched with the latest Junos OS releases.