Article Detail

Product Affected

This is a zero day issue which affects all JUNOS devices that support RSVP.

Severity

High

Severity Assessment (CVSS) Score

7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)

Problem

RPD has been found to terminate unexpectedly during security/resiliency testing using the Codenomicon test suite. The RPD core was caused by a specific RSVP packet and has never been seen in a production network. This issue requires RSVP to be configured on the target interface of the router and RSVP traceoptions to be enabled on the router. Interfaces which are not configured with RSVP will log the following message when receiving the errant RSVP data:

Apr 9 22:03:11.523108 RSVP error, disabled on fe-0/2/0.0, input pkt dropped

The RSVP packet can be sent from a remote device. It does not have to be sourced from an adjacent device.

Solution

All JUNOS software releases built on or after 2010-03-16 have resolved this issue. Releases containing this fix include: 8.5S6, 9.0S3, 9.1S8, 9.3R3, 9.4R2, 9.5R1, 9.6R4, 10.0R3, 10.1R2, and all subsequent releases.

This issue is being tracked as PR 421821. While this PR is not viewable by customers, it can be used as a reference when discussing the issue with JTAC.

How to obtain Service Releases:

Security vulnerabilities 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 notices will indicate which Maintenance and/or 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.

Workaround

The following suggestions can be used to reduce the risk to the device:

Disable RSVP on any port which is not needed. The issue requires RSVP to be configured on the destination address.
Add packet filter rules to the router's host firewall filter (lo0) which limits which devices are authorized to send RSVP packets to the router.
Add packet filter rules to the network's edge "iACLs," limiting which devices outside of your network which are authorized to send RSVP packets to the router.
Turn off RSVP traceoptions (see http://www.juniper.net/techpubs/en_US/junos/information-products/topic-collections/nog-mpls-model/topic-19886.html#jd0e8639 for details)

Note that configuring the network for RSVP MD5 is ineffective at mitigating this vulnerability.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found in KB 16446 [juniper.net]: "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Related Information

KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories. [juniper.net]