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2017-10 Security Bulletin: Junos OS: A kernel hang may occur due to a specific loopback filter action command (CVE-2017-10613)

  [JSA10816] Show Article Properties


Product Affected:
Junos OS
Problem:

A vulnerability in a specific loopback filter action command, processed in a specific logical order of operation, in a running configuration of Juniper Networks Junos OS, allows an attacker with CLI access and the ability to initiate remote sessions to the loopback interface with the defined action, to hang the kernel.

Affected releases are Juniper Networks Junos OS 12.1X46 prior to 12.1X46-D55; 12.3X48 prior to 12.3X48-D35; 14.1 prior to 14.1R8-S4, 14.1R9; 14.1X53 prior to 14.1X53-D40; 14.2 prior to 14.2R4-S9, 14.2R7-S8, 14.2R8; 15.1 prior to 15.1F5-S3, 15.1F6, 15.1R4; 15.1X49 prior to 15.1X49-D60; 15.1X53 prior to 15.1X53-D47; 16.1 prior to 16.1R2.

No other Juniper Networks products or platforms are affected by this issue.

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

This issue has been assigned CVE-2017-10613.

Solution:

The following software releases have been updated to resolve this specific issue: 12.1X46-D55, 12.3X48-D35, 14.1R8-S4, 14.1R9*, 14.1X53-D40*, 14.2R4-S9, 14.2R7-S8, 14.2R8*, 15.1F5-S3, 15.1F6, 15.1R4, 15.1X49-D60, 15.1X53-D47, 16.1R2, 16.2R1, and all subsequent releases.

This issue is being tracked as PR 1167423 and is visible on the Customer Support website.

*Fix Pending Publication

Workaround:

Discontinue the use of allowing remote sessions to be issued from the local device to reach loopback address(es).

It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device from trusted, administrative networks or hosts.

Implementation:
How to obtain fixed software:
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:
5.5 (CVSS:3.0/AV:L/AC:L/PR:L/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."