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2017-10 Security Bulletin: Junos: SRX cluster denial of service vulnerability in flowd due to multicast packets (CVE-2017-10619)

  [JSA10821] Show Article Properties


Product Affected:
This issue affects Junos OS 12.3X48, 15.1X49. Affected platforms: SRX1400, SRX3400, SRX3600, SRX5400, SRX5600, SRX5800.
Problem:
When Express Path (formerly known as service offloading) is configured on SRX1400, SRX3400, SRX3600, SRX5400, SRX5600, SRX5800 in high availability cluster configuration mode, certain multicast packets might cause the flowd process to crash, halting or interrupting traffic from flowing through the device and triggering RG1+ (data-plane) fail-over to the secondary node.  Repeated crashes of the flowd process may constitute an extended denial of service condition.

This service is not enabled by default and is only supported in high-end SRX platforms.

This issue only occurs when Express Path is configured in high availability cluster configuration mode with multicast routing configured.

The Express Path is enabled using the following command:

# set chassis fpc # pic # services-offload (for SRX1400/SRX3K/SRX5K)
# set chassis fpc # np-cache (for SRX5000 with Modular Port Concentrator, MPC)

The Express Path needs to be configured under the [security policy from-zone X to-zone X then permit services-offload] stanza.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability, however, this issue has been seen in a customer environment.

This issue has been assigned CVE-2017-10619.
 

Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.3X48-D45, 15.1X49-D80, 17.3R1, and all subsequent releases.

This issue is being tracked as PR 1233849 and is visible on the Customer Support website.
 
Workaround:

There are no viable workarounds for this issue.
 

Implementation:
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:
2017-10-11: 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:
High
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."