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2017-01 Security Bulletin: Junos: Denial of service vulnerability in jdhcpd due to crafted DHCPv6 packets (CVE-2017-2301)

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Article ID: JSA10769 SECURITY_ADVISORIES Last Updated: 11 Jan 2017Version: 1.0
Product Affected:
This issue can affect any product or platform running Junos OS with DHCPv6 enabled
Problem:
The Junos OS jdhcpd daemon provides advanced DHCP services to subscribers on all major hardware platforms, including MX/vMX Series, SRX Series, EX Series, QFX Series, and ACX Series.  An issue was discovered that can cause jdhcpd to crash and restart when a crafted DHCPv6 packet is received from a subscriber. Repeated crashes of the jdhcpd process may constitute an extended denial of service condition for subscribers attempting to obtain IPv6 addresses.

This issue only affects devices configured for DHCP services via IPv6 with either Server or Relay enabled.  IPv4 is not vulnerable to this issue.

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

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

This issue has been assigned CVE-2017-2301.
Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 11.4R13-S3, 12.1X46-D60, 12.3R12-S2, 12.3R13, 12.3X48-D40, 13.2X51-D40, 13.3R10, 14.1R8, 14.1X53-D12, 14.1X53-D35, 14.1X55-D35, 14.2R7, 15.1F6, 15.1R3, 15.1X49-D60, 15.1X53-D30, 16.1R1, and all subsequent releases.

This issue is being tracked as PR 1137586 and is visible on the Customer Support website.

KB16765 - "In which releases are vulnerabilities fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.
Workaround:
No known workaround exists for this issue.
Implementation:
How to obtain fixed software:
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:

2017-01-11: Initial publication

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

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