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2017-07 Security Bulletin: Junos OS: jdhcpd daemon crash due to invalid IPv6 UDP packets (CVE-2017-2348)

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Product Affected:
This issue affects Junos OS 14.1X53, 15.1, 15.1X49, 15.1X53.

The Juniper Enhanced jdhcpd daemon may experience high CPU utilization, or crash and restart upon receipt of an invalid IPv6 UDP packet. Both high CPU utilization and repeated crashes of the jdhcpd daemon can result in a denial of service as DHCP service is interrupted.

Affected releases are Juniper Networks Junos OS 14.1X53 prior to 14.1X53-D12, 14.1X53-D38, 14.1X53-D40 on QFX, EX, QFabric System; 15.1 prior to 15.1F2-S18, 15.1R4 on all products and platforms; 15.1X49 prior to 15.1X49-D80 on SRX; 15.1X53 prior to 15.1X53-D51, 15.1X53-D60 on NFX, QFX, EX.

No other Juniper Networks products or platforms are affected by this issue.

This issue affects all devices with the Enhanced jdhcpd service enabled and is not limited to devices configured for DHCPv6, e.g. a jdhcpd service configured for and serving only IPv4 that receives an invalid IPv6 udp packet will be affected.

This issue has been assigned CVE-2017-2348.


The following software releases have been updated to resolve this specific issue: 14.1X53-D12, 14.1X53-D38, 14.1X53-D40, 15.1F2-S18, 15.1R4, 15.1X49-D80, 15.1X53-D51, 15.1X53-D60, 16.1R1, and all subsequent releases.

This issue is being tracked as PR 1119019 and is visible on the Customer Support website.

Devices that have the ability to transition from Juniper's Enhanced DHCP server, JDHCPD, to the Legacy DHCP server, DHCPD, can move back to Legacy.
Devices that do not support the ability to transition from Enhanced DHCP to Legacy DHCP do not have a workaround available unless customers decide to disable the DHCP services and forward DHCP client requests to other DHCP servers or discontinue the use of DHCP services.
Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of "PRs fixed" can be provided on request.
Modification History:
  • 2017-07-12: Initial Publication.


Related Links:
CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:
Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."