On Juniper Networks Junos OS devices, a specific SNMP OID poll causes a memory leak which over time leads to a kernel crash (vmcore).

Prior to the kernel crash other processes might be impacted, such as failure to establish SSH connection to the device.

The administrator can monitor the output of the following command to check if there is memory leak caused by this issue:

This issue affects Juniper Networks Junos OS:

• 17.4R3;
• 18.1 version 18.1R3-S5 and later versions prior to 18.1R3-S10;
• 18.2 version 18.2R3 and later versions prior to 18.2R3-S3;
• 18.2X75 version 18.2X75-D420, 18.2X75-D50 and later versions prior to 18.2X75-D430, 18.2X75-D53, 18.2X75-D60;
• 18.3 version 18.3R3 and later versions prior to 18.3R3-S2;
• 18.4 version 18.4R1-S4, 18.4R2 and later versions prior to 18.4R2-S5, 18.4R3-S1;
• 19.1 version 19.1R2 and later versions prior to 19.1R2-S2, 19.1R3;
• 19.2 version 19.2R1 and later versions prior to 19.2R1-S5, 19.2R2;
• 19.3 versions prior to 19.3R2-S5, 19.3R3;
• 19.4 versions prior to 19.4R1-S3, 19.4R2.

This issue does not affect Juniper Networks Junos OS prior to 17.4R3.
 

The example of minimum config stanza affected by this issue:

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2020-1683 .

The following software releases have been updated to resolve this specific issue: Junos OS 17.4R3-S1, 18.1R3-S10, 18.2R3-S3, 18.2X75-D41, 18.2X75-D430, 18.2X75-D53, 18.2X75-D60, 18.3R3-S2, 18.4R2-S5, 18.4R3-S1, 19.1R2-S2, 19.1R3, 19.2R1-S5, 19.2R2, 19.3R2-S5, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1, and all subsequent releases.

This issue is being tracked as 1482379 .

Software releases or updates are available for download at https://www.juniper.net/support/downloads/ .

Disable SNMP (disabled by default), utilize edge filtering with source-address validation (uRPF, etc.), access control lists (ACLs), and/or SNMPv3 authentication to limit access to the device only from trusted hosts.

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2020-1683 at cve.mitre.org