2018-07 Security Bulletin: Junos OS: Kernel crash (vmcore) during broadcast storm after enabling 'monitor traffic interface fxp0' (CVE-2018-0029)

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Product Affected:
This issue affects Junos OS 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.2X75, 17.3, 17.4.
Problem:
While experiencing a broadcast storm, placing the fxp0 interface into promiscuous mode via the 'monitor traffic interface fxp0' can cause the system to crash and restart (vmcore).

This issue only affects Junos OS 15.1 and later releases, and affects both single core and multi-core REs. Releases prior to Junos OS 15.1 are unaffected by this vulnerability

Affected releases are Juniper Networks Junos OS:
  • 15.1 versions prior to 15.1F6-S11, 15.1R4-S9, 15.1R6-S6, 15.1R7;
  • 15.1X49 versions prior to 15.1X49-D140;
  • 15.1X53 versions prior to 15.1X53-D59 on EX2300/EX3400;
  • 15.1X53 versions prior to 15.1X53-D67 on QFX10K;
  • 15.1X53 versions prior to 15.1X53-D233 on QFX5200/QFX5110;
  • 15.1X53 versions prior to 15.1X53-D471, 15.1X53-D490 on NFX;
  • 16.1 versions prior to 16.1R3-S8, 16.1R5-S4, 16.1R6-S1, 16.1R7;
  • 16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3;
  • 17.1 versions prior to 17.1R1-S7, 17.1R2-S7, 17.1R3;
  • 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3;
  • 17.2X75 versions prior to 17.2X75-D90, 17.2X75-D110;
  • 17.3 versions prior to 17.3R1-S4, 17.3R2;
  • 17.4 versions prior to 17.4R1-S3, 17.4R2.

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-2018-0029.
 
Solution:
The following software releases have been updated to resolve this specific issue: 15.1F6-S11*, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D140, 15.1X53-D233, 15.1X53-D471, 15.1X53-D490, 15.1X53-D59, 15.1X53-D67, 16.1R3-S8, 16.1R5-S4, 16.1R6-S1, 16.1R7, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R1-S7, 17.1R2-S7, 17.1R3, 17.2R1-S6, 17.2R2-S4, 17.2R3, 17.2X75-D110, 17.2X75-D90, 17.3R1-S4, 17.3R2, 17.4R1-S3, 17.4R2, 18.1R1, 18.1X75-D10, and all subsequent releases.
*Future availability

This issue is being tracked as PR 1322294 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:
Avoid executing the 'monitor traffic interface fxp0' command while attempting to troubleshoot broadcast storms.
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/
 
Modification History:
2018-07-11: Initial Publication

Related Links:
CVSS Score:
5.7 (CVSS:3.0/AV:A/AC:L/PR:N/UI:R/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."