2015-04 Security Bulletin: SRX Series: ISC BIND vulnerability denial of service in delegation handling (CVE-2014-8500)

Product Affected:This issue affects all SRX Series devices running Junos OS 12.1X44, 12.1X46, 12.1X47

Problem:ISC BIND software included with Junos for SRX series devices is affected by CVE-2014-8500. This may allow a network based attacker to cause a denial of service condition on SRX devices. This issue only affects SRX devices where “set system services dns dns-proxy” has been configured. This is not enabled by default on SRX devices.This issue does not affect other Junos OS based devices as they do not have BIND DNS server feature. Juniper SIRT is not aware of any malicious exploitation of this vulnerability.This issue has been assigned CVE-2014-8500.

Solution:The following software releases have been updated to resolve this specific issue: Junos OS 12.1X44-D50 (pending release) 12.1X46-D35 (pending release) 12.1X47-D25 (pending release) 12.3X48-D10 and all subsequent releases.This issue is being tracked as PR 1048628 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:There are no known workarounds.

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: 2015-04-08: Initial release.

Related Links: CVSS Score:4.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P)

Risk Level:Low

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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