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Product Affected

This issue affects Junos OS 20.4R3-S4, 21.2R3-S2, 21.4R2, 22.1R2, 22.2, 22.3, 22.4. Affected platforms: QFX5000 Series, EX4400 Series, EX4100 Series, EX4650 Series

Severity

Medium

Severity Assessment (CVSS) Score

CVSS 3.1: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVSS 4.0: 7.1 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem

An Improper Isolation or Compartmentalization vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, or an EX4100 Series, EX4400 Series or EX4650 Series device, allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).

If a specific malformed LACP packet is received by a QFX5000 Series, or an EX4100 Series , EX4400 Series or EX4650 Series device, an LACP flap will occur resulting in traffic loss.

This issue affects Junos OS on QFX5000 Series, EX4100 Series, EX4400 Series or EX4650 Series:

20.4 versions from 20.4R3-S4 before 20.4R3-S8,
21.2 versions from 21.2R3-S2 before 21.2R3-S6,
21.4 versions from 21.4R2 before 21.4R3-S4,
22.1 versions from 22.1R2 before 22.1R3-S3,
22.2 versions before 22.2R3-S1,
22.3 versions before 22.3R2-S2, 22.3R3,
22.4 versions before 22.4R2-S1, 22.4R3.

To be affected by this issue the device must have an LACP configuration as shown in the following example must be present:

  [interfaces <interface> ...ether-options 802.3ad ae<number>]
  [interfaces ae<number> aggregated-ether-options lacp]

Solution

The following software releases have been updated to resolve this specific issue: Junos OS: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S4, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2-S1, 22.4R3, 23.2R1, and all subsequent releases.

This issue is being tracked as 1711783 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround

There are no known workarounds for this issue.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories.

Modification History