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Product Affected

This issue affects Junos OS 18.4R2 and above prior to 20.4R3-S8, 21.1, 21.2, 21.3, 21.4, 22.1, 22.2, 22.3, 22.4. Affected platforms: QFX5000 Series, EX4600 Series.

Severity

Medium

Severity Assessment (CVSS) Score

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

Problem

An Improper Input Validation vulnerability in the VxLAN packet forwarding engine (PFE) of Juniper Networks Junos OS on QFX5000 Series, EX4600 Series devices allows an unauthenticated, adjacent attacker, sending two or more genuine packets in the same VxLAN topology to possibly cause a DMA memory leak to occur under various specific operational conditions. The scenario described here is the worst-case scenario. There are other scenarios that require operator action to occur.

An indicator of compromise may be seen when multiple devices indicate that FPC0 has gone missing when issuing a show chassis fpc command, and a number of interfaces have also gone missing.

Use the following command to determine if FPC0 has gone missing from the device.

show chassis fpc detail

This issue affects:

Juniper Networks Junos OS on QFX5000 Series, EX4600 Series:

18.4 version 18.4R2 and later versions prior to 20.4R3-S8;
21.1 version 21.1R1 and later versions prior to 21.2R3-S6;
21.3 versions prior to 21.3R3-S5;
21.4 versions prior to 21.4R3-S4;
22.1 versions prior to 22.1R3-S3;
22.2 versions prior to 22.2R3-S1;
22.3 versions prior to 22.3R2-S2, 22.3R3;
22.4 versions prior to 22.4R2.

To be potentially exposed to this issue the device must be configured in a VxLAN scenario. Refer to product documentation for how to configure VxLAN as there are different configuration options.

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-2023-44183.

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, 23.2R1, and all subsequent releases.

This issue is being tracked as PR 1729767 which is visible on the Customer Support website.

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

Workaround

There are no available 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