CVE-2019-0019 : Exploit Details and Defense Strategies

Enabling BGP tracing can lead to the Junos OS routing protocol daemon (rpd) process crashing and restarting when receiving an incoming BGP message, potentially causing a Denial of Service (DoS) situation.

Understanding CVE-2019-0019

This CVE addresses a vulnerability in Juniper Networks Junos OS versions that can be exploited through BGP tracing.

What is CVE-2019-0019?

When BGP tracing is enabled, an incoming BGP message can crash the rpd process, potentially leading to a DoS situation.

The Impact of CVE-2019-0019

CVSS Base Score: 7.5 (High)
Attack Vector: Network
Availability Impact: High
Attack Complexity: Low
Privileges Required: None
Scope: Unchanged
User Interaction: None
Confidentiality Impact: None
Integrity Impact: None

Technical Details of CVE-2019-0019

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Enabling BGP tracing in Junos OS can cause the rpd process to crash and restart upon receiving specific BGP messages, potentially leading to a DoS condition.

Affected Systems and Versions

The following Junos OS versions are affected:

16.1 versions before 16.1R7-S4, 16.1R7-S5
16.2 versions before 16.2R2-S9, 16.2R3
17.1 versions before 17.1R3
17.2 versions before 17.2R3-S1
17.3 versions before 17.3R3-S3, 17.3R3-S4, 17.3R4
17.4 versions before 17.4R1-S7, 17.4R2-S3, 17.4R2-S4, 17.4R3
18.1 versions before 18.1R2-S4, 18.1R3-S4, 18.1R4
18.2 versions before 18.2R2-S2, 18.2R2-S3, 18.2R3
18.2X75 versions before 18.2X75-D40
18.3 versions before 18.3R1-S3, 18.3R2
18.4 versions before 18.4R1-S2, 18.4R2

Exploitation Mechanism

Juniper SIRT has not detected any malicious exploitation of this vulnerability.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2019-0019 vulnerability.

Immediate Steps to Take

Disable BGP tracing to prevent the rpd process crashes.
Implement authentication mechanisms like tcp-md5 or ipsec for BGP to enhance security.

Long-Term Security Practices

Regularly update Junos OS to the patched versions provided by Juniper Networks.

Patching and Updates

Ensure your Junos OS is updated to the following versions or later to address this issue:

16.1R7-S4, 16.1R7-S5, 16.2R2-S9, 16.2R3, 17.1R3, 17.2R3-S1, 17.3R3-S3, 17.3R3-S4, 17.3R4, 17.4R1-S7, 17.4R2-S3, 17.4R2-S4, 17.4R3, 18.1R2-S4, 18.1R3-S4, 18.1R4, 18.2R2-S2, 18.2R2-S3, 18.2R3, 18.2X75-D40, 18.3R1-S3, 18.3R2, 18.4R1-S2, 18.4R2, 19.1R1, and subsequent releases.