On QFX and PTX Series, receipt of a malformed packet for J-Flow sampling might crash the FPC (Flexible PIC Concentrator) process which causes all interfaces to go down.
By continuously sending the offending packet, an attacker can repeatedly crash the FPC process causing a sustained Denial of Service (DoS).
This issue affects both IPv4 and IPv6 packet processing.
Affected releases are Juniper Networks Junos OS on QFX and PTX Series:
This issue only occurs when J-Flow is configured and learning next-hop addresses feature that is used to generate the true outgoing interface (OIF) statistic is enabled: [services flow-monitoring (version-ipfix | version9) template <template-name> nexthop-learning] Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
[services flow-monitoring (version-ipfix | version9) template <template-name> nexthop-learning]
This issue was seen during production usage.
This issue has been assigned CVE-2019-0014 .
The following software releases have been updated to resolve this specific issue: Junos OS 17.2X75-D91, 17.2X75-D100, 17.4R2-S1, 17.4R3, 18.1R3-S1, 18.2R1-S3, 18.2R2, 18.2X75-D5, 18.3R1, and all subsequent releases.
This issue is being tracked as PR 1348417 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).
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/ .
Disable the functionality of learning of next-hop addresses: # set services flow-monitoring (version-ipfix | version9) template <template-name> nexthop-learning disable
# set services flow-monitoring (version-ipfix | version9) template <template-name> nexthop-learning disable