CVE-2018-0006 Explained : Impact and Mitigation
Learn about CVE-2018-0006, a denial of service vulnerability in Juniper Networks Junos OS versions prior to 15.1R6-S2, 15.1R7, 16.1R5-S1, 16.1R6, 16.2R2-S2, 16.2R3, 17.1R2-S5, 17.1R3, and 17.2R2. Find out the impact, affected systems, and mitigation steps.
An excessive number of VLAN authentication attempts originating from a neighboring host on the same broadcast domain can lead to a denial of service situation by causing high memory utilization in the BBE subscriber management daemon (bbe-smgd). This issue affects Juniper Networks Junos OS versions prior to 15.1R6-S2, 15.1R7, 16.1R5-S1, 16.1R6, 16.2R2-S2, 16.2R3, 17.1R2-S5, 17.1R3, and 17.2R2.
Understanding CVE-2018-0006
This CVE involves a denial of service vulnerability in Junos OS related to processing VLAN authentication requests/rejects.
What is CVE-2018-0006?
- An issue in Junos OS can lead to a denial of service due to high memory usage caused by an excessive number of VLAN authentication attempts.
- The vulnerability affects devices configured for DHCPv4/v6 over AE auto-sensed VLANs.
The Impact of CVE-2018-0006
- Attack Complexity: Low
- Attack Vector: Adjacent Network
- Availability Impact: High
- Base Score: 6.5 (Medium Severity)
- No impact on Confidentiality or Integrity
- No privileges required for exploitation
Technical Details of CVE-2018-0006
This section provides more in-depth technical information about the vulnerability.
Vulnerability Description
- Processing an unbounded number of pending VLAN authentication requests leads to excessive memory allocation.
Affected Systems and Versions
- Juniper Networks Junos OS versions prior to 15.1R6-S2, 15.1R7, 16.1R5-S1, 16.1R6, 16.2R2-S2, 16.2R3, 17.1R2-S5, 17.1R3, and 17.2R2.
Exploitation Mechanism
- No known malicious exploitation reported by Juniper SIRT.
Mitigation and Prevention
Steps to address and prevent the CVE-2018-0006 vulnerability.
Immediate Steps to Take
- Utilize a static VLAN model instead of auto-sensed or dynamic VLANs.
Long-Term Security Practices
- Regularly update Junos OS to the patched versions.
Patching and Updates
- Update to the following software releases: 15.1R6-S2, 15.1R7, 16.1R5-S1, 16.1R6, 16.2R2-S2, 16.2R3, 17.1R2-S5*, 17.1R3*, 17.2R2, 17.3R1, 17.4R1, and subsequent releases.
*Pending release