Product Affected

This issue affects all versions of Junos OS prior to 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2, 21.3, 21.4. Affected platforms: EX4650 Series.
High
7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)

Problem

Due to an Improper Initialization vulnerability in Juniper Networks Junos OS on EX4650 devices, packets received on the management interface (em0) but not destined to the device, may be improperly forwarded to an egress interface, instead of being discarded. Such traffic being sent by a client may appear genuine, but is non-standard in nature and should be considered as potentially malicious.
 

This issue affects Juniper Networks Junos OS on EX4650 Series:

  • All versions prior to 19.1R3-S8;
  • 19.2 versions prior to 19.2R3-S5;
  • 19.3 versions prior to 19.3R3-S5;
  • 19.4 versions prior to 19.4R3-S7;
  • 20.1 versions prior to 20.1R3-S3;
  • 20.2 versions prior to 20.2R3-S4;
  • 20.3 versions prior to 20.3R3-S3;
  • 20.4 versions prior to 20.4R3-S2;
  • 21.1 versions prior to 21.1R3-S1;
  • 21.2 versions prior to 21.2R3;
  • 21.3 versions prior to 21.3R2;
  • 21.4 versions prior to 21.4R2.


Juniper SIRT is not aware of any malicious exploitation of this vulnerability.


This issue was found during internal product security testing or research.


This issue has been assigned CVE-2022-22186.

Solution

The following software releases have been updated to resolve this specific issue: 19.1R3-S8, 19.2R3-S5, 19.3R3-S5, 19.4R3-S7, 20.1R3-S3, 20.2R3-S4, 20.3R3-S3, 20.4R3-S2, 21.1R3-S1, 21.2R3, 21.3R2, 21.4R2, 22.1R1, and all subsequent releases.

This issue is being tracked as PR 1628754 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).

 
Implementation

Software Releases, patches and updates are available at https://support.juniper.net/support/downloads/.

Workaround

Disabling the net.transit_re sysctl flag will also cause management traffic forwarded to the PFE ports to be dropped:

% sysctl -w net.transit_re=0

Note that sysctl flags do not survive a reboot.

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

  • 2022-04-13: Initial Publication.

Related Information