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             AUSCERT External Security Bulletin Redistribution

   JSA11054 - 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)
                              15 October 2020


        AusCERT Security Bulletin Summary

Product:           Junos OS
                   MX Series
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
                   Reduced Security  -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-1660  

Original Bulletin: 

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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)

Article ID  : JSA11054
Last Updated: 14 Oct 2020
Version     : 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.

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:

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


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 .


There are no viable workarounds for this issue.

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:
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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