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2017-07 Security Bulletin: Junos: Denial of Service vulnerability in rpd daemon (CVE-2017-2347)

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Article ID: JSA10795 SECURITY_ADVISORIES Last Updated: 04 Dec 2017Version: 5.0
Product Affected:
This issue affects Junos OS 12.3X48, 13.3, 14.1, 14.1X53, 14.2, 15.1, 15.1X49, 15.1X53, 16.1.
Problem:

A denial of service vulnerability in rpd daemon of Juniper Networks Junos OS allows a malformed MPLS ping packet to crash the rpd daemon. Repeated crashes of the rpd daemon can result in an extended denial of service condition for the device.

The affected releases are Junos OS:

  • 12.3X48 prior to 12.3X48-D50, 12.3X48-D55;
  • 13.3 prior to 13.3R10;
  • 14.1 prior to 14.1R4-S13, 14.1R8-S3, 14.1R9;
  • 14.1X53 prior to 14.1X53-D42;
  • 14.2 prior to 14.2R4-S8,
  • 14.2R7-S6, 14.2R8;
  • 15.1 prior to 15.1F2-S14, 15.1F5-S7, 15.1F6-S4, 15.1F7, 15.1R4-S7, 15.1R5-S1, 15.1R6;
  • 15.1X49 prior to 15.1X49-D100;
  • 15.1X53 prior to 15.1X53-D47, 15.1X53-D62, 15.1X53-D105;
  • 16.1 prior to 16.1R3-S3, 16.1R4.

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

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue has been assigned CVE-2017-2347.

Solution:

The following software releases have been updated to resolve this specific issue:

  • 12.3X48-D50,
  • 12.3X48-D55,
  • 13.3R10,
  • 14.1R4-S13,
  • 14.1R8-S3,
  • 14.1R9,
  • 14.1X50-D185,
  • 14.1X53-D42,
  • 14.2R4-S8,
  • 14.2R7-S6,
  • 14.2R8,
  • 15.1F2-S14,
  • 15.1F5-S7,
  • 15.1F6-S4,
  • 15.1F7,
  • 15.1R4-S7,
  • 15.1R5-S1,
  • 15.1R6,
  • 15.1X49-D100,
  • 15.1X53-D105,
  • 15.1X53-D47,
  • 15.1X53-D62,
  • 16.1R3-S3,
  • 16.1R4,
  • 16.2R1,
  • 17.1R1, and all subsequent releases.

This issue is being tracked as PR 1204027 and is visible on the Customer Support website.

Workaround:

There are no viable workarounds for this issue.

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 router only from trusted, administrative networks or hosts.

Implementation:
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:
  • 2017-07-12: Initial Publication

  • ‚Äč2017-08-09: Problem description update: Confirmed that MPLS OAM configuration is not a required condition to exploit this vulnerability

  • 2017-10-30: Updated fixed release

  • 2017-12-04: Minor non-technical update. Put list of Junos OS releases in a bullet list.

CVSS Score:
6.5 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
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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