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2018-07 Security Bulletin: Junos OS: Stateless IP firewall filter rules stop working as expected after reboot or upgrade (CVE-2018-0026)

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Article ID: JSA10859 SECURITY_ADVISORIES Last Updated: 11 Jul 2018Version: 2.0
Product Affected:
This issue affects Junos OS 15.1, 15.1X8.
Problem:
After Junos OS device reboot or upgrade, the stateless firewall filter configuration may not take effect.

This issue can be verified by running the command:
  user@re0> show interfaces <interface_name> extensive | match filters"
      CAM destination filters: 0, CAM source filters: 0


Note: when the issue occurs, it does not show the applied firewall filter.

The correct output should show the applied firewall filter, for example:
  user@re0> show interfaces <interface_name> extensive | match filters"
      CAM destination filters: 0, CAM source filters: 0
        Input Filters: FIREWAL_FILTER_NAME-<interface_name>


This issue affects firewall filters for every address family.

Affected releases are Juniper Networks Junos OS:
15.1R4, 15.1R5, 15.1R6 and SRs based on these MRs.
15.1X8 versions prior to 15.1X8.3.

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-2018-0026.
Solution:
The following software releases have been updated to resolve this specific issue: 15.1R7, 15.1X8.3 and all subsequent releases.

This issue is being tracked as PR 1161832 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:
There are no known workarounds for this issue.

However, once the issue has occurred, it can be restored by performing "commit full" (note: "commit full" is a potentially disruptive command).
Modification History:
2018-07-11: Initial Publication.
CVSS Score:
4.7 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N)
Severity Level:
Medium
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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