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2021-04 Security Bulletin: Junos OS and Junos OS Evolved: QFX5K Series: Underlay network traffic might not be processed upon receipt of high rate of specific genuine overlay packets in VXLAN scenario (CVE-2021-0259)

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Article ID: JSA11150 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 3.0
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, 20.1, 20.2, 20.3. Affected platforms: QFX5K Series. This issue affects Junos OS Evolved . Affected platforms: QFX5220.
Problem:

Due to a vulnerability in DDoS protection in Juniper Networks Junos OS and Junos OS Evolved on QFX5K Series switches in a VXLAN configuration, instability might be experienced in the underlay network as a consequence of exceeding the default ddos-protection aggregate threshold. If an attacker on a client device on the overlay network sends a high volume of specific, legitimate traffic in the overlay network, due to an improperly detected DDoS violation, the leaf might not process certain L2 traffic, sent by spines in the underlay network. Continued receipt and processing of the high volume traffic will sustain the Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS on QFX5K Series:

  • 17.3 versions prior to 17.3R3-S11;
  • 17.4 versions prior to 17.4R3-S5;
  • 18.1 versions prior to 18.1R3-S13;
  • 18.2 versions prior to 18.2R2-S8, 18.2R3-S8;
  • 18.3 versions prior to 18.3R3-S5;
  • 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6;
  • 19.1 versions prior to 19.1R3-S4;
  • 19.2 versions prior to 19.2R1-S6, 19.2R3-S2;
  • 19.3 versions prior to 19.3R3-S2;
  • 19.4 versions prior to 19.4R2-S4, 19.4R3-S1;
  • 20.1 versions prior to 20.1R2;
  • 20.2 versions prior to 20.2R2;
  • 20.3 versions prior to 20.3R1-S2, 20.3R2.

Juniper Networks Junos OS Evolved on QFX5220:

  • All versions prior to 20.3R2-EVO.


An example of a configuration affected by this issue is shown below:

routing-instance evpn10 {
  vtep-source-interface lo0.0;
  instance-type evpn;
  vlan-id 10;
  interface xe-0/0/2.10;
  vxlan {
    vni 10;
  }
  route-distinguisher 10.255.181.13:10;
  vrf-target target:10:10;
  protocols {
    evpn;
  }
}


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-2021-0259.
 

Solution:

The following software releases have been updated to resolve this specific issue:

Junos OS: 17.3R3-S11, 17.4R3-S5, 18.1R3-S13, 18.2R2-S8, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases.

Junos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1499681.
 

Workaround:
There are no available workarounds for this issue.
 
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:
7.4 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
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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