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2021-04 Security Bulletin: Junos OS: EX4300-MP/EX4600/QFX5K Series: Packet Forwarding Engine manager (FXPC) process crashes when deployed in a Virtual Chassis (VC) configuration (CVE-2021-0237)

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Article ID: JSA11132 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 1.0
Product Affected:
This issue affects Junos OS 15.1, 17.3, 17.4, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3. Affected platforms: EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series.
Problem:

On Juniper Networks EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series deployed as a Virtual Chassis with a specific Layer 2 circuit configuration, Packet Forwarding Engine manager (FXPC) process may crash and restart upon receipt of specific layer 2 frames.

Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.

This issue affects Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series:

  • 15.1 versions prior to 15.1R7-S9;
  • 17.3 versions prior to 17.3R3-S11;
  • 17.4 versions prior to 17.4R2-S13, 17.4R3-S4, 17.4R3-S5;
  • 18.2 versions prior to 18.2R3-S8;
  • 18.3 versions prior to 18.3R3-S4;
  • 18.4 versions prior to 18.4R2-S7, 18.4R3-S6;
  • 19.1 versions prior to 19.1R3-S4;
  • 19.2 versions prior to 19.2R1-S6, 19.2R3-S1;
  • 19.3 versions prior to 19.3R3-S1;
  • 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, 20.2R3;
  • 20.3 versions prior to 20.3R1-S2, 20.3R2;

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

[protocols l2circuit neighbor <address> interface <interface-name>]

used together with

[protocols mpls interface <interface-name>]

or

[protocols ospf area <area-id> interface <interface-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-2021-0237.

Solution:

The following software releases have been updated to resolve this specific issue: 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 17.4R3-S5, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R3-S1, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases.

This issue is being tracked as 1528409.

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:
2021-04-14: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
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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