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2020-10 Security Bulletin: Junos OS: MX Series: Services card might restart due to a race condition when DNS filtering is enabled. (CVE-2020-1667)

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Article ID: JSA11064 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 might be bypassed due to a race condition. Due to this vulnerability, mspmand process, responsible for managing "URL Filtering service", can 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 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 example of the configuration stanza affected by this issue is as follows:

[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-2020-1667.

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 1466567.

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."

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