CVE-2020-1643 : Security Advisory and Response

This CVE involves an issue in Juniper Networks' Junos OS that may lead to a Denial of Service (DoS) condition due to the crash and restart of the routing protocols process (RPD) when specific OSPF interface CLI commands are executed.

Understanding CVE-2020-1643

This vulnerability impacts Juniper Networks' Junos OS, potentially causing a DoS attack through an RPD crash triggered by specific CLI commands.

What is CVE-2020-1643?

The vulnerability in Junos OS causes RPD to crash and restart when executing particular OSPF interface CLI commands, potentially enabling a local attacker to conduct a sustained DoS attack.

The Impact of CVE-2020-1643

The vulnerability can lead to a DoS condition by repeatedly crashing the RPD process if OSPF interface authentication is configured. Only systems with ARM processors like EX2300 and EX3400 are vulnerable to this issue.

Technical Details of CVE-2020-1643

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Executing specific OSPF interface CLI commands can crash the RPD process, potentially enabling DoS attacks.

Affected Systems and Versions

Affected versions include a range from 12.3X48-D100 to 18.3R2 across various Junos OS releases.

Exploitation Mechanism

There are no known instances of malicious exploitation by Juniper SIRT related to this vulnerability.

Mitigation and Prevention

To mitigate the risks associated with CVE-2020-1643, consider the following steps:

Immediate Steps to Take

Upgrade to software releases that resolve the issue, starting from 12.3X48-D100 to 18.4R1 and subsequent versions.
Limit access to Junos CLI and shell to trusted administrators.
Restrict access to specific OSPF CLI commands until an upgrade is performed.

Long-Term Security Practices

Regularly update Junos OS to the latest versions to ensure security patches are applied.
Implement access controls and authentication mechanisms to enhance system security.

Patching and Updates

Ensure that all affected systems are updated with the latest software releases to address the vulnerability.