Product Affected:This issue can affect any product or platform running Junos OS.

Problem:Multiple vulnerabilities in Junos OS have been resolved by updating the libxml2 library. Libxml2 was upgraded from 2.7.6 to 2.9.1 which resolves the following vulnerabilities:CVECVSS v2 base scoreSummaryCVE-2011-19449.3 (AV:N/AC:M/Au:N/C:C/I:C/A:C)Denial of service or arbitrary code execution vulnerability.CVE-2012-51346.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)Denial of service or arbitrary code execution vulnerability.CVE-2012-08415.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P)Denial of service vulnerability related to hash collisions.CVE-2013-28775.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P)Denial of service related to documents that end abruptly.CVE-2013-03384.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P)Denial of service vulnerability related to entity expansion.These issues can be potentially exploited through Junos OS services that make use of the libxml2 library such as CLI, J-Web, JUNOScript or NETCONF​ to cause a denial of service or code execution with elevated privileges on the device.

Solution:The following software releases have been updated to resolve this specific issue: Junos OS 11.4R13, 12.1X44-D35, 12.1X44-D40, 12.1X45-D30, 12.1X46-D25, 12.1X47-D10, 12.2R9 12.3R7, 13.1R4-S2, 13.3R3, 14.1R2, 14.2R1 and all subsequent releases (i.e. all releases built after 11.4R13).This issue is being tracked as PR 984070 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:Use access lists or firewall filters to limit access to the router only from trusted hosts or users.Disabling J-WEB, JUNOScript, NETCONF and restricting Junos CLI access to trusted users can help in reducing risks associated with these issues.

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: 2015-01-14: Initial publication.

Related Links: CVSS Score:9.3 (AV:N/AC:M/Au:N/C:C/I:C/A:C)

Risk Level:Critical

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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