CVE-2019-0011 Explained : Impact and Mitigation

A vulnerability in Junos OS could allow an attacker to crash the kernel, leading to a Denial of Service (DoS) attack.

Understanding CVE-2019-0011

This CVE involves a specific incoming packet to the out-of-band management interface in Junos OS, potentially causing a kernel crash.

What is CVE-2019-0011?

The Junos OS kernel can crash when processing a particular incoming packet directed towards the out-of-band management interface and intended for another destination address. This vulnerability could be exploited by continuously sending such packets, resulting in a sustained Denial of Service attack.

The Impact of CVE-2019-0011

CVSS Base Score: 6.5 (Medium Severity)
Attack Vector: Adjacent Network
Availability Impact: High
No Confidentiality or Integrity Impact
No Privileges Required
No User Interaction Required
Scope: Unchanged
Juniper SIRT has not detected any malicious exploitation of this vulnerability.

Technical Details of CVE-2019-0011

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The Junos OS kernel crashes after handling a specific incoming packet to the out-of-band management interface, potentially leading to a DoS condition.

Affected Systems and Versions

The following Juniper Networks Junos OS versions are affected:

17.2 versions before 17.2R1-S7, 17.2R3
17.3 versions before 17.3R3-S3
17.4 versions before 17.4R1-S4, 17.4R2
17.2X75 versions before 17.2X75-D110
18.1 versions before 18.1R2

Exploitation Mechanism

An attacker can exploit this vulnerability by continuously sending specific packets to the out-of-band management interface, causing the kernel to crash.

Mitigation and Prevention

Protect your systems from CVE-2019-0011 with the following measures:

Immediate Steps to Take

Apply a firewall filter on the management interface to allow only necessary traffic.

Long-Term Security Practices

Regularly update Junos OS to the patched versions.

Patching and Updates

Update to the following software releases to address this issue: Junos OS 17.2R1-S7, 17.2R3, 17.2X75-D110, 17.3R3-S3, 17.4R1-S4, 17.4R2, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.