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2018-10 Security Bulletin: QFX5000/EX4600 Series: Routing protocol flap upon receipt of high rate of Ethernet frames (CVE-2018-0054)

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Product Affected:
This issue affects Junos OS 14.1X53, 15.1, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.2X75, 17.3, 17.4, 18.1. Affected platforms: QFX5000 Series and EX4600.
Problem:

On QFX5000 Series and EX4600 switches, a high rate of Ethernet pause frames or an ARP packet storm received on the management interface (fxp0) can cause egress interface congestion, resulting in routing protocol packet drops, such as BGP, leading to peering flaps. The following log message may also be displayed:

fpc0 dcbcm_check_stuck_buffers: Buffers are stuck on queue 7 of port 45

This issue only affects the QFX5000 Series products (QFX5100, QFX5110, QFX5200, QFX5210) and the EX4600 switch. No other platforms are affected by this issue.

Affected releases are Juniper Networks Junos OS:

  • 14.1X53 versions prior to 14.1X53-D47 on QFX5000 Series and EX4600;
  • 15.1 versions prior to 15.1R7, 15.1R8 on QFX5000 Series and EX4600;
  • 15.1X53 versions prior to 15.1X53-D233 on QFX5000 Series and EX4600;
  • 16.1 versions prior to 16.1R7 on QFX5000 Series and EX4600;
  • 16.2 versions prior to 16.2R3 on QFX5000 Series and EX4600;
  • 17.1 versions prior to 17.1R2-S9, 17.1R3 on QFX5000 Series and EX4600;
  • 17.2 versions prior to 17.2R2-S6, 17.2R3 on QFX5000 Series and EX4600;
  • 17.2X75 versions prior to 17.2X75-D42 on QFX5000 Series and EX4600;
  • 17.3 versions prior to 17.3R3 on QFX5000 Series and EX4600;
  • 17.4 versions prior to 17.4R2 on QFX5000 Series and EX4600;
  • 18.1 versions prior to 18.1R2 on QFX5000 Series and EX4600.

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-2018-0054.
 

Solution:

The following software releases have been updated to resolve this specific issue: 14.1X53-D47, 15.1R7, 15.1R8, 15.1X53-D233, 16.1R7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.2X75-D42, 17.3R3, 17.4R2, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.

This issue is being tracked as PR 1343597 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).
 

Workaround:
For BGP, configure 'ether-options no-flow-control' on the BGP interface.

Configure the lossless percentage of ingress shared buffer pool to be greater than the egress shared buffer pool. For example:

[edit class-of-service shared-buffer]
user@switch# set ingress buffer-partition lossless percent <percent>
user@switch# set egress buffer-partition lossless percent <percent>
 
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
‚Äč2018-10-10: Initial publication

Related Links:
CVSS Score:
6.5 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:
Medium
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."