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CVE-2020-1683 : Security Advisory and Response

Learn about CVE-2020-1683, a vulnerability in Juniper Networks Junos OS causing memory leaks via SNMP polling, potentially resulting in kernel crashes. Find mitigation steps and necessary updates.

On Juniper Networks Junos OS devices, a specific SNMP OID poll causes a memory leak leading to a kernel crash (vmcore) and potential impacts on device processes.

Understanding CVE-2020-1683

What is CVE-2020-1683?

This CVE involves a memory leak issue on Juniper Networks Junos OS devices triggered by a specific SNMP OID poll, potentially resulting in a kernel crash.

The Impact of CVE-2020-1683

The vulnerability can lead to a kernel crash due to memory leaks via SNMP polling, affecting system stability and potentially disrupting critical services.

Technical Details of CVE-2020-1683

Vulnerability Description

The SNMP OID poll on Junos OS devices causes a memory leak, which can ultimately lead to a kernel crash (vmcore) and impact other device processes.

Affected Systems and Versions

        Junos OS 17.4R3
        Junos OS 18.1 versions prior to 18.1R3-S10
        Versions 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, and 19.4 before specified updates

Exploitation Mechanism

The vulnerability is triggered by a specific SNMP OID poll, resulting in a memory leak that can compromise system stability.

Mitigation and Prevention

Immediate Steps to Take

        Update to the patched versions provided by Juniper Networks
        Monitor memory usage regularly to detect any unusual patterns indicative of the issue

Long-Term Security Practices

        Implement edge filtering with source-address validation like uRPF and access control lists (ACLs)
        Utilize SNMPv3 authentication to restrict access to trusted hosts

Patching and Updates

Ensure the Junos OS is updated to versions 17.4R3-S1, 18.1R3-S10, 18.2R3-S3, 18.2X75-D41, 18.3R3-S2, 18.4R2-S5, 19.1R2-S2, 19.2R1-S5, 19.3R2-S5, 19.4R1-S3, 20.1R1, or subsequent releases.

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