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2016-01 Security Bulletin: Junos: RPD crash in processing LDP packets (CVE-2016-1257)

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Categories:
Security Advisories ID: JSA10715
Last Updated: 19 Jan 2016
Version: 4.0

Product Affected:
This issue can affect any product or platform running a Junos OS release listed below with LDP enabled

Problem:

If LDP is enabled via the 'protocols ldp' configuration option on a device running Junos OS, receipt of a spoofed, crafted LDP packet may cause the RPD routing process to crash and restart.  The interface on which the packet arrives does not need to have LDP enabled.  As long as one interface to the peer has LDP enabled and the packet is received as part of an existing session, the packet will be sent to Routing Engine for further processing, exposing the router to a denial of service (RPD crash).

This issue is a regression defect introduced in JUNOS 13.2R5, 13.3R1, 14.1R1, 14.2R1, and 15.1 releases. Junos versions prior to 13.2R5 are not 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 due to LDP packets originating from a different vendor's device.

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

This issue has been assigned CVE-2016-1257.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 13.3R7-S3, 13.3R8, 14.1R3-S9, 14.1R4-S7, 14.1R6, 14.1X51-D65, 14.1X53-D12, 14.1X53-D28, 14.1X53-D35, 14.2R3-S4, 14.2R4-S1, 14.2R5, 15.1F2-S2, 15.1F3, 15.1R3, 15.1X49-D40* and all subsequent releases.

This issue is being tracked as PR 1096835 and is visible on the Customer Support website.

*15.1X49-D40 will be available later in Q1/2016

Workaround:
Use access lists or firewall filters to limit access to the device via LDP only from trusted networks or hosts, or enable MD5 authentication on all authorized LDP sessions.

Alternately, if LDP is not required, disabling LDP will completely mitigate this issue.

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:

2016-01-13: Initial publication.
2016-01-13: Added MD5 authentication as workaround.
2016-01-18: Confirmed that disabling LDP will mitigate issue.

Related Links:

CVSS Score:
5.9 (CVSS:3.0/AV:N/AC:H/PR:N/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."

Acknowledgements:
 

 
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