2015-07 Security Bulletin: Junos: RPD crash after change of local-preference on IBGP peer (CVE-2015-5359)

Product Affected:This issue can affect any product or platform running Junos OS with IBGP and VPLS configured.

Problem:Upon receipt of a large set of label blocks containing an updated BGP local preference (due to configuration changes on IBGP peers), RPD may crash with a NULL pointer access exception. The crash was triggered by a large number of BGP-VPLS advertisements with updated BGP local preference values. Note that this issue can only be triggered from inside a customer’s network. MPLS labels are not usually exchanged outside the protected network, and are usually only received from a PE or RR in the same network. 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-2015-5359.

Solution:The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D50, 12.1X46-D35, 12.1X47-D25, 12.3R9, 12.3X48-D10, 13.2R7, 13.3R5, 14.1R3-S2, 14.1R4, 14.2R2, 15.1R1, and all subsequent releases. This issue is being tracked as PR 1047437 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.

Workaround:Avoid bulk modification of local-preference or limit major BGP configuration changes to a maintenance window.

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: 2015-07-08: Initial publication

Related Links: CVSS Score:CVSSv2: 7.1 (AV:N/AC:M/Au:N/C:N/I:N/A:C)

Risk Level:High

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.”

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