2017-07 Security Bulletin: SRX, vSRX and J-Series: Denial of service vulnerability in ISC BIND (CVE-2017-3135)

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Product Affected:
This issue affects Junos OS 12.3X46, 12.3X48, 15.1X49. Affected platforms: SRX Series, J Series, vSRX.
Problem:

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

CVE CVSS v2 base score Summary
CVE-2017-3135 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Under some conditions when using both DNS64 and RPZ to rewrite query responses, query processing can resume in an inconsistent state leading to either an INSIST assertion failure or an attempt to read through a NULL pointer.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

Solution:

The following software releases have been updated to resolve this specific issue:12.1X46-D67, 12.3X48-D50, 15.1X49-D80 and all subsequent releases.

Further, this issue has been proactively fixed in future releases of SRX-Series from 17.2R1 and all subsequent releases.

This issue is being tracked as PR 1253302 and is visible on the Customer Support website.

Workaround:

There are no viable workarounds for this issue.

It is 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 device from trusted, administrative networks or hosts.

Implementation:
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:
  • 2017-07-12: Initial Publication.

 

Related Links:
CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
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."