On Juniper Networks Junos OS platforms configured as DHCPv6 local server or DHCPv6 Relay Agent, Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) process might crash with a core dump if a malformed DHCPv6 packet is received, resulting with the restart of the daemon.

This issue only affects DHCPv6, it does not affect DHCPv4.

This issue affects: Juniper Networks Junos OS

• 17.4 versions prior to 17.4R2-S12, 17.4R3-S3;
• 18.1 versions prior to 18.1R3-S11;
• 18.2 versions prior to 18.2R3-S6;
• 18.2X75 versions prior to 18.2X75-D65;
• 18.3 versions prior to 18.3R2-S4, 18.3R3-S3;
• 18.4 versions prior to 18.4R2-S5, 18.4R3-S4;
• 19.1 versions prior to 19.1R3-S2;
• 19.2 versions prior to 19.2R1-S5, 19.2R3;
• 19.2 version 19.2R2 and later versions;
• 19.3 versions prior to 19.3R2-S4, 19.3R3;
• 19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3;
• 20.1 versions prior to 20.1R1-S3, 20.1R2;

This issue does not affect Juniper Networks Junos OS prior to 17.4R1.

The example of DHCPv6 local server configuration stanza affected by this issue is:

The example of configuration stanza for DHCPv6 Relay Agent affected by this issue is:

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-2020-1671 .

The following software releases have been updated to resolve this specific issue: Junos OS 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D65, 18.3R2-S4, 18.3R3-S3, 18.4R2-S5, 18.4R3-S4, 19.1R3-S2, 19.2R1-S5, 19.2R3, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2-S2, 19.4R3, 20.1R1-S3, 20.1R2, 20.2R1 and all subsequent releases.

This issue is being tracked as 1511782 .

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

There are no viable workarounds for this issue.

2020-10-14: Initial Publication.

• 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-2020-1671 at cve.mitre.org