This issue affects Junos OS 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3.
In a Dynamic Host Configuration Protocol version 6 (DHCPv6) environment, the jdhcpd daemon may crash and restart upon receipt of certain DHCPv6 solicit messages received from a DHCPv6 client. By continuously sending the same crafted packet, an attacker can repeatedly crash the jdhcpd process causing a sustained Denial of Service (DoS) to both IPv4 and IPv6 clients.
Affected releases are Juniper Networks Junos OS:
- 15.1 versions prior to 15.1F6-S12, 15.1R7-S3;
- 15.1X49 versions prior to 15.1X49-D171, 15.1X49-D180;
- 15.1X53 versions prior to 15.1X53-D236, 15.1X53-D496;
- 16.1 versions prior to 16.1R3-S10, 16.1R7-S4;
- 16.2 versions prior to 16.2R2-S8;
- 17.1 versions prior to 17.1R2-S10, 17.1R3;
- 17.2 versions prior to 17.2R1-S8, 17.2R3-S1;
- 17.3 versions prior to 17.3R3-S3;
- 17.4 versions prior to 17.4R1-S6, 17.4R2-S3;
- 18.1 versions prior to 18.1R2-S4, 18.1R3-S2;
- 18.2 versions prior to 18.2R2;
- 18.2X75 versions prior to 18.2X75-D30;
- 18.3 versions prior to 18.3R1-S2.
This issue does not affect Junos OS releases prior to 15.1.
Sample configuration:
user@host# edit system services dhcp-local-server dhcpv6
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-2019-0037.
The following software releases have been updated to resolve this specific issue: Junos OS 15.1F6-S12, 15.1R7-S3, 15.1X49-D171, 15.1X49-D180, 15.1X53-D236, 15.1X53-D496, 16.1R3-S10, 16.1R7-S4, 16.2R2-S8, 17.1R2-S10, 17.1R3, 17.2R1-S8, 17.2R3-S1, 17.3R3-S3, 17.4R1-S6, 17.4R2-S3, 18.1R2-S4, 18.1R3-S2, 18.2R2, 18.2X75-D30, 18.3R1-S2, 18.4R1, and all subsequent releases.
This issue is being tracked as PR 1391983 which is visible on the Customer Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
No known workaround exists for this issue.
Software Releases, patches and updates are available at
https://www.juniper.net/support/downloads/.
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."