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2017-10 Security Bulletin: SRX Series: Antivirus updates are downloaded without verification (CVE-2017-10620)

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Article ID: JSA10822 SECURITY_ADVISORIES Last Updated: 11 Oct 2017Version: 1.0
Product Affected:
This issue affects Junos OS 12.1X46, 12.3X48, 15.1X49. Affected platforms: SRX Series.
Problem:

Juniper Networks Junos OS on SRX series devices do not verify the HTTPS server certificate before downloading anti-virus updates. This may allow a man-in-the-middle attacker to inject bogus signatures to cause service disruptions or make the device not detect certain types of attacks.

Affected Junos OS releases are:

12.1X46 prior to 12.1X46-D71;

12.3X48 prior to 12.3X48-D55;

15.1X49 prior to 15.1X49-D110;

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

This issue has been assigned CVE-2017-10620.

Solution:

The following software releases have been updated to resolve this specific issue: 12.1X46-D71, 12.1X46-D73, 12.3X48-D55, 15.1X49-D110, 17.4R1, and all subsequent releases.

This issue is being tracked as PR 1217408 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:
2017-10-11: Initial Publication.
CVSS Score:
7.4 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H)
Severity Level:
High
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."

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