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2015-07 Security Bulletin: Junos: IPv6 sendd denial of service due to crafted packet (CVE-2015-5360)

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Article ID: JSA10688 SECURITY_ADVISORIES Last Updated: 20 Nov 2015Version: 4.0
Product Affected:
This issue can affect any product or platform running Junos OS.
Problem:
A vulnerability in processing Secure Neighbor Discovery (SEND) Protocol packets can result in a high CPU consumption denial of service condition on Junos devices. Transit traffic is unaffected, but CLI responsiveness and processing of IPv6 packets via the link-local addresses may be impacted. The issue can occur only when the Secure Neighbor Discovery feature has been configured via the 'set protocols neighbor-discovery secure security-level default' option.

This issue was discovered by an external security researcher.

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

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

This issue has been assigned CVE-2015-5360.
Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D51, 12.1X46-D36, 12.1X46-D45*, 12.1X47-D25, 12.3R10, 12.3X48-D20, 13.2R8, 13.3R6, 14.1R5, 14.2R3, 15.1R1, 15.1X49-D20, and all subsequent releases.

This issue is being tracked as PR 1055018 and is visible on the Customer Support website.

KB16765 - "In which releases are vulnerabilities fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.

*12.1X46-D45 will be available after 06-Jan-2016.
Workaround:
If Secure Neighbor Discovery is not required, disabling 'neighbor-discovery secure' within the 'protocols' configuration hierarchy will 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:
Modification History:

2015-07-08: Initial publication
2015-07-22: Added clarification of partial availability impact
2015-11-20: Clarified 12.1X46-D45 fixed release and availability date

CVSS Score:
CVSSv2: 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P)
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."
Acknowledgements:
The Juniper SIRT would like to acknowledge and thank Daniel Edwards of Microsoft Corporation for responsibly reporting this vulnerability.

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