CVE-2018-0027 : Vulnerability Insights and Analysis
Learn about CVE-2018-0027, a vulnerability in Juniper Networks Junos OS versions prior to 16.1R3 that could lead to a denial of service condition by crashing the routing protocol daemon (RPD). Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
A vulnerability in Juniper Networks Junos OS versions prior to 16.1R3 could allow an attacker to cause the routing protocol daemon (RPD) to crash, leading to a denial of service condition.
Understanding CVE-2018-0027
This CVE involves the receipt of a malformed RSVP packet that can trigger a denial of service by crashing the RPD.
What is CVE-2018-0027?
If a specially crafted or improperly formatted RSVP PATH message is received, it may cause the RPD to become unresponsive or crash, disrupting network connectivity.
The Impact of CVE-2018-0027
- The vulnerability can lead to an extended disruption in network connectivity due to the unavailability of RPD to process routing updates.
- This issue affects Junos OS 16.1 versions released before 16.1R3 but does not impact releases prior to 16.1R1.
- RSVP must be activated on an interface for the vulnerability to be triggered.
- Juniper SIRT has not detected any malicious exploitation of this vulnerability.
Technical Details of CVE-2018-0027
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
Receipt of a malformed RSVP PATH message can cause the RPD to hang or crash, leading to a denial of service condition.
Affected Systems and Versions
- Product: Junos OS
- Vendor: Juniper Networks
- Affected Version: 16.1 (versions before 16.1R3)
- Unaffected Version: 16.1 (versions before 16.1R1)
Exploitation Mechanism
- Attack Complexity: Low
- Attack Vector: Network
- Availability Impact: High
- Privileges Required: None
- User Interaction: None
- CVSS Base Score: 7.5 (High)
Mitigation and Prevention
Protecting systems from CVE-2018-0027 involves taking immediate steps and implementing long-term security practices.
Immediate Steps to Take
- Only enable RSVP on specific trusted interfaces as required for MPLS.
Long-Term Security Practices
- Regularly update Junos OS to the patched versions: 16.1R3, 16.2R1, and all subsequent releases.
Patching and Updates
- Ensure that the software releases have been updated to resolve the specific issue.