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2021-07 Security Bulletin: Junos OS: QFX5000 Series and EX4600 Series: Enhanced storm control might not work leading to partial Denial of Service (CVE-2021-0294)

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Article ID: JSA11196 SECURITY_ADVISORIES Last Updated: 14 Jul 2021Version: 1.0
Product Affected:
This issue affects Juniper Networks Junos OS 18.4R2-S5 on QFX5000 Series and EX4600 Series.
Problem:
A vulnerability in Juniper Networks Junos OS, which only affects the release 18.4R2-S5, where a function is inconsistently implemented on Juniper Networks Junos QFX5000 Series and EX4600 Series, and if 'storm-control enhanced' is configured,  can lead to the enhanced storm control filter group not be installed.  It will cause storm control not to work hence allowing an attacker to cause high CPU usage or packet loss issues by sending a large amount of broadcast or unknown unicast packets arriving the device.

This issue affects Juniper Networks QFX5100, QFX5110, QFX5120, QFX5200, QFX5210, EX4600, and EX4650, and QFX5100 with QFX 5e Series image installed.

QFX5130 and QFX5220 are not affected from this issue.

This issue only affects the above devices if configured with:

[ forwarding-options storm-control enhanced ]


No other product or platform is affected by this vulnerability.

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-2021-0294.
 

Solution:
The following software releases has been updated to resolve this specific issue: Junos OS 18.4R2-S6.

This issue is being tracked as 1544160.
 
Workaround:
There are no viable workarounds for this issue.
 
Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
 
Modification History:
2021-07-14: Initial Publication.

CVSS Score:
5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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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