CVE-2018-0005 : What You Need to Know
Learn about CVE-2018-0005 affecting Juniper Networks Junos OS, where QFX and EX Series switches may forward traffic instead of dropping it, leading to denials of services. Find mitigation steps and updated software releases.
CVE-2018-0005, a vulnerability in Junos OS, can lead to denials of service or unintended situations due to the forwarding of traffic instead of discarding it when the MAC move limit is exceeded.
Understanding CVE-2018-0005
What is CVE-2018-0005?
CVE-2018-0005 affects Juniper Networks Junos OS versions 14.1X53-D40, 15.1X53-D55, and 15.1R7, where QFX and EX Series switches may redirect traffic instead of dropping it, potentially causing service denials or unexpected scenarios.
The Impact of CVE-2018-0005
The vulnerability poses a high severity risk with a CVSS base score of 7.4. While no malicious exploitation has been reported, the potential for denials of service exists.
Technical Details of CVE-2018-0005
Vulnerability Description
When MAC move limits are exceeded, QFX and EX Series switches forward traffic instead of dropping it, leading to service denials or unintended outcomes.
Affected Systems and Versions
- Junos OS 14.1X53 versions before 14.1X53-D40
- Junos OS 15.1X53 versions before 15.1X53-D55
- Junos OS 15.1 versions before 15.1R7
Exploitation Mechanism
The vulnerability has a low attack complexity and requires no user interaction, impacting availability with a changed scope.
Mitigation and Prevention
Immediate Steps to Take
- Increase the MAC move limit rate on devices to reduce the risk
- Remove the MAC move limit from device configurations as a temporary workaround
Long-Term Security Practices
- Regularly update Junos OS to patched versions
- Monitor network traffic for anomalies
Patching and Updates
Software releases 14.1X53-D40, 15.1X53-D55, 15.1X53-D60, 16.1R1, and subsequent versions address this vulnerability.