Product Affected

This issue can affect all Junos routers configured with a Next-Gen MVPN routing instance that uses Ingress Replication as the P-tunnel type and has either Auto-RP or Bootstrap as the group-to-RP mapping mechanism.
High
7.1 (AV:N/AC:M/Au:N/C:N/I:N/A:C)

Problem


In a Next Generation MVPN scenario, a kernel memory buffer may get corrupted when the router receives a bootstrap or auto-RP message whose packet size exceeds 204 bytes. The memory corruption will cause the Junos kernel to crash every time such a packet is received. This problem will only be encountered in a Next-Gen MVPN scenarios that use Ingress Replication as the P-tunnel type and has Auto-RP or Bootstrap as the group-to-RP mapping mechanism.

Solution


Software has been modified to insure that the mbuf pointer is correctly updated when a new mbuf is prepended.

All Junos OS software releases built on or after 2011-10-07 have fixed this specific issue. Releases containing the fix specifically include: 9.3S25, 10.0S19, 10.4S7, 11.1S5, 11.2S2, 11.3R2 and all subsequent releases (i.e. all releases built after 11.3R2).

This issue is being tracked as PR 681963. While this PR may not be viewable by customers, it can be used as a reference when discussing the issue with JTAC.

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


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


No known workaround exists for this issue.

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."

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