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             AUSCERT External Security Bulletin Redistribution

         unos OS: MX Series: Services card might restart when DNS
                   filtering is enabled (CVE-2020-1645)
                                9 July 2020


        AusCERT Security Bulletin Summary

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-1645  

Original Bulletin: 

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2020-07 Security Bulletin: Junos OS: MX Series: Services card might restart when DNS filtering is enabled (CVE-2020-1645)

Article ID  : JSA11028
Last Updated: 08 Jul 2020
Version     : 1.0

Product Affected:
This issue affects Junos OS 17.3, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4. 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.

If the issue occurs, system core-dumps output will show a crash of mspmand

root@device> show system core-dumps
- -rw-rw---- 1 nobody wheel 575685123 <Date> /var/tmp/pics/mspmand.core.<*>.gz

This issue affects Juniper Networks Junos OS:

17.3 versions prior to 17.3R3-S8;

18.3 versions prior to 18.3R2-S4, 18.3R3-S1;

18.4 versions prior to 18.4R2-S5, 18.4R3;

19.1 versions prior to 19.1R2-S2, 19.1R3;

19.2 versions prior to 19.2R1-S5, 19.2R2;

19.3 versions prior to 19.3R2-S3, 19.3R3;

19.4 versions prior to 19.4R1-S3, 19.4R2.

This issue does not affect Juniper Networks Junos OS releases prior to 17.3R2.

The example of the configuration stanza affected by this issue is as follows:

[services service-set <SERVICE-SET-NAME>]
user@host# set web-filter-profile <PROFILE_NAME>

used in combination with:

[services web-filter profile <PROFILE_NAME>]
user@host# set 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-2020-1645 .


The following software releases have been updated to resolve this specific
issue: 18.3R2-S4, 18.3R3-S1, 18.4R2-S5, 18.4R3, 19.1R2-S2, 19.1R3, 19.2R1-S5,
19.2R2, 19.3R2-S3, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1, and all subsequent

This issue is being tracked as 1474056 .

There are no viable workarounds for this issue.
Software release Service Packages are available at http://support.juniper.net 
from the "Download Software" links.
Modification History:

2020-07-08: 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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