Support Support Downloads Knowledge Base Juniper Support Portal Community

Knowledge Base

Search our Knowledge Base sites to find answers to your questions.

Ask All Knowledge Base Sites All Knowledge Base Sites JunosE Defect (KA)Knowledge BaseSecurity AdvisoriesTechnical BulletinsTechnotes Sign in to display secure content and recently viewed articles

2017-04 Security Bulletin: SRX, vSRX and J-Series: Multiple vulnerabilities in ISC BIND named.



Article ID: JSA10785 SECURITY_ADVISORIES Last Updated: 20 Nov 2017Version: 3.0
Product Affected:
These issues can affect any SRX, vSRX and J-Series with DNS Proxy server enabled.

ISC BIND software included with Junos OS on SRX, vSRX and J-Series devices has been upgraded to resolve the following vulnerabilities:

CVE CVSS base score Summary
CVE-2016-2776 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) buffer.c in named in ISC BIND does not properly construct responses, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a crafted query.
CVE-2016-8864 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) named in ISC BIND allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a DNAME record in the answer section of a response to a recursive query, related to db.c and resolver.c.
CVE-2016-9131 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) named in ISC BIND allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a malformed response to an RTYPE ANY query.
CVE-2016-9147 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) named in ISC BIND allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a response containing an inconsistency among the DNSSEC-related RRsets.
CVE-2016-9444 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) named in ISC BIND 9.x before 9.9.9-P5, 9.10.x before 9.10.4-P5, and 9.11.x before 9.11.0-P2 allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a crafted DS resource record in an answer.

These issues only affect devices where DNS proxy service is enabled.

DNS proxy feature is disabled by default.

Juniper SIRT is not aware of any malicious exploitation of these vulnerabilities on Juniper products.

CVE-2016-2776 has been addressed in Junos OS 12.1X46-D65, 12.3X48-D45, 15.1X49-D70, and all subsequent releases.

CVE-2016-8864 has been addressed in Junos OS 12.3X48-D60, 15.1X49-D120, 17.3R2, 17.4R1, and all subsequent releases.

CVE-2016-9131, CVE-2016-9147 and CVE-2016-9444 have been addressed in Junos OS 12.1X46-D66, 12.3X48-D50, 15.1X49-D80, and all subsequent releases.

This issues are being tracked as PR 1219438, 1228678, 1245686, and 1307435, and are visible on the Customer Support website.
DNS proxy service may be disabled to workaround all these issues.

You may view the status of DNS proxy service via the command: 
  show system services dns-proxy statistics 
DNS proxy statistics        :
    Status            		: enabled
Accepting DNS queries only from trusted network would mitigate CVE-2016-2776 which requires a malicious client side request to trigger the named crash.

Firewall filters limiting receipt of DNS queries on TCP and UDP port 53 can be implemented for different hosted groups of DNS servers; external DNS servers should be separate from internal DNS servers. External DNS servers should only accept DNS queries from internal DNS servers and reject externally facing DNS queries if using BIND.

A layered approach utilizing non-BIND based DNS servers may be taken as well; non-BIND servers can be deployed for externally hosted domains, and servers using BIND can be deployed internally.

In addition to the recommendations listed above, it is a good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the devices only from trusted, administrative networks or hosts.
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:
2017-04-12: Initial release.
2017-11-20: Separated fix for CVE-2016-8864 into its own set of fixed releases.

CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Related Links

Comment on this article > Affected Products Browse the Knowledge Base for more articles related to these product categories. Select a category to begin.

Getting Up and Running with Junos

Getting Up and Running with Junos Security Alerts and Vulnerabilities Product Alerts and Software Release Notices Problem Report (PR) Search Tool EOL Notices and Bulletins JTAC User Guide Customer Care User Guide Pathfinder SRX High Availability Configurator SRX VPN Configurator Training Courses and Videos End User Licence Agreement Global Search