Support Support Downloads Knowledge Base Case Manager My Juniper 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

2020-10 Security Bulletin: Junos OS: MX Series: Receipt of specific packets can cause services card to restart when DNS filtering is configured. (CVE-2020-1660)

0

0

Article ID: JSA11054 SECURITY_ADVISORIES Last Updated: 14 Oct 2020Version: 1.0
Product Affected:
This issue affects Junos OS 17.3, 18.3, 18.4, 19.1, 19.2, 19.3. Affected platforms: MX Series.
Problem:

When DNS filtering is enabled on Juniper Networks Junos MX Series with one of the following cards MS-PIC, MS-MIC or MS-MPC, an incoming stream of packets processed by the Multiservices PIC Management Daemon (mspmand) process, responsible for managing "URL Filtering service", may crash, causing the Services PIC to restart. While the Services PIC is restarting, all PIC services including DNS filtering service (DNS sink holing) will be bypassed until the Services PIC completes its boot process. This vulnerability might allow an attacker to cause an extended Denial of Service (DoS) attack against the device and to cause clients to be vulnerable to DNS based attacks by malicious DNS servers when they send DNS requests through the device. As a result, devices which were once protected by the DNS Filtering service are no longer protected and at risk of exploitation.

This issue affects Juniper Networks Junos OS:

  • 17.3 versions prior to 17.3R3-S8;
  • 18.3 versions prior to 18.3R3-S1;
  • 18.4 versions prior to 18.4R3;
  • 19.1 versions prior to 19.1R3;
  • 19.2 versions prior to 19.2R2;
  • 19.3 versions prior to 19.3R3.

This issue does not affect Juniper Networks Junos OS 17.4, 18.1, and 18.2.

The following minimal configuration is required:

[services web-filter profile profile-name dns-filter-template <template-name>]

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

This issue was seen during production usage.

This issue has been assigned CVE-2020-1660.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S8, 18.3R3-S1, 18.4R3, 19.1R3, 19.2R2, 19.3R3, 19.4R1 and all subsequent releases.

This issue is being tracked as 1469188.

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
Modification History:
2020-10-14: Initial Publication.
CVSS Score:
8.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L)
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."

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