2016-01: Security Bulletin: Junos: Multicast denial of service related to IGMPv3 (CVE-2016-1256)

Product Affected

This issue can affect any product or platform running Junos OS with IGMPv3 enabled

Severity

Medium

Severity Assessment (CVSS) Score

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

Problem

Receipt of a crafted IGMPv3 protocol message can create a denial of service to a portion of a multicast network. This issue only affects IGMPv3. IGMPv2 is unaffected by this vulnerability.

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-2016-1256 .

Solution

The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D55, 12.1X46-D40, 12.1X47-D25, 12.3R10, 12.3X48-D20, 13.2R8, 13.2X51-D40, 13.3R7, 14.1R5, 14.1X53-D18, 14.1X53-D30, 14.1X55-D25, 14.2R4, 15.1R2, 15.1X49-D10, and all subsequent releases.

This issue is being tracked as PR 1079503 and is visible on the Customer Support website.

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.

Workaround

Disabling IGMPv3, falling back to IGMPv2, will mitigate this issue, but may result in reduced functionality (e.g. PIM source-specific multicast requires IGMPv3).

Severity Assessment

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

Modification History

Modification History:

2016-01-13: Initial publication