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Invalid RSVP packet causes RPD process busy loop and router becomes unresponsive

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Article ID: JSA10421 SECURITY_ADVISORIES Last Updated: 09 May 2013Version: 3.0
Legacy Advisory Id:
PSN-2010-01-625
Product Affected:
All JUNOS Devices
Problem:
Specifically craft and invalid RSVP packets will cause the RPD process to enter a busy loop or crash. The router will become unresponsive and may require a restart to restore RSVP.

This issue was discovered via internal and customer security testing.
Solution:
All JUNOS software releases built on or after March 27, 2009 have been corrected to correct this RSVP issue. This specifically includes 8.1-20090515-SR, 8.5-20090501-SR, 9.0-20090612-SR , 9.1-20090327.0, 9.2R2, 9.3R1, 9.4R1, and all subsequent releases.

PR Reference for this issue is PR 296141 (Note: the RSVP Security issue PSN-2010-01-621 is fixed with the same PR. These are two different conditions but where fixed with the same PR.)

RSVP Authentication is an effective mitigation technique to limit the exposure to this RSVP issue. The JUNOS documentation has confguration examples to properly configure RSVP Authentication. For example, the example for JUNOS 10.0 is here: http://www.juniper.net/techpubs/en_US/junos10.0/information-products/topic-collections/config-guide-mpls-applications/frameset.html.

Filtering RSVP packets on the edge of the network with iACL (Infrastructure ACLs) is another mitigation technique which will limit the exposure of this issue.
Implementation:
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.
CVSS Score:
7.1 - (AV:N/AC:M/Au:N/C:N/I:N/A:C)
Severity Level:
Critical
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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