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2021-04 Security Bulletin: Junos OS: QFX5100-96S: DDoS protection does not work as expected. (CVE-2021-0234)

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Article ID: JSA11129 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 1.0
Product Affected:
This issue affects Junos OS 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4. Affected platforms: QFX5100-96S.
Problem:

Due to an improper Initialization vulnerability on Juniper Networks Junos OS QFX5100-96S devices with QFX 5e Series image installed, ddos-protection configuration changes will not take effect beyond the default DDoS (Distributed Denial of Service) settings when configured from the CLI. The DDoS protection (jddosd) daemon allows the device to continue to function while protecting the packet forwarding engine (PFE) during the DDoS attack. When this issue occurs, the default DDoS settings within the PFE apply, as CPU bound packets will be throttled and dropped in the PFE when the limits are exceeded.

To check if the device has this issue, the administrator can execute the following command to monitor the status of DDoS protection:

user@device> show ddos-protection protocols
error: the ddos-protection subsystem is not running

This issue affects only QFX5100-96S devices. No other products or platforms are affected by this issue.

This issue affects:

Juniper Networks Junos OS on QFX5100-96S:

  • 17.3 versions prior to 17.3R3-S10;
  • 17.4 versions prior to 17.4R3-S4;
  • 18.1 versions prior to 18.1R3-S10;
  • 18.2 versions prior to 18.2R3-S3;
  • 18.3 versions prior to 18.3R3-S2;
  • 18.4 versions prior to 18.4R2-S4, 18.4R3-S1;
  • 19.1 versions prior to 19.1R3, 19.1R3-S4;
  • 19.2 versions prior to 19.2R2;
  • 19.3 versions prior to 19.3R3;
  • 19.4 versions prior to 19.4R2;

The DDoS feature is enabled by default, there is no specific config stanza required to enable DDoS protection.

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-2021-0234.

Solution:

The following software releases have been updated to resolve this specific issue: 17.3R3-S10, 17.4R3-S4, 18.1R3-S10, 18.2R3-S3, 18.3R3-S2, 18.4R2-S4, 18.4R3-S1, 19.1R3, 19.1R3-S4, 19.2R2, 19.3R3, 19.4R2, 20.1R1, and all subsequent releases.

This issue is being tracked as 1486480.

Workaround:

The following command can be used to enable ddos-protection manually:

root@device% /usr/sbin/jddosd -N &
Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
Modification History:
2021-04-14: Initial Publication.
CVSS Score:
5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L)
Severity Level:
Medium
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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