CVE-2023-36833

published 2023-07-14

CVE-2023-36833: A Use After Free vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS Evolved on PTX10001-36MR, and PTX10004, PTX10008, PTX10016…

Priority P4 28 medium 6.5 CVSS 3.1

AV A AC L PR N UI N S U C N I N A H

A Use After Free vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS Evolved on PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202 allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS).

The process 'aftman-bt' will crash after multiple flaps on a multicast-only fast reroute (MoFRR) enabled interface. This will cause the respective FPC to stop forwarding traffic and it needs to be rebooted to restore the service.

An indication that the system experienced this issue is the following log message:

evo-aftmand-bt[]: [Error] jexpr_fdb: sanity check failed, ... , app_name L3 Mcast Routes

This issue affects Juniper Networks Junos OS Evolved on PTX10001-36MR, PTX10004, PTX10008, PTX10016 with LC1201/1202:
21.2 version 21.2R1-EVO and later versions;
21.3 version 21.3R1-EVO and later versions;
21.4 versions prior to 21.4R3-S3-EVO;
22.1 version 22.1R1-EVO and later versions;
22.2 versions prior to 22.2R3-S2-EVO;
22.3 versions prior to 22.3R3-EVO;
22.4 versions prior to 22.4R1-S2-EVO, 22.4R2-EVO.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
juniper	junos_os	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper_networks	junos_os_evolved	>= 21.2 < 21.2*	21.2*
juniper_networks	junos_os_evolved	>= 21.3 < 21.3*	21.3*
juniper_networks	junos_os_evolved	>= 21.4 < 21.4R3-S3-EVO	21.4R3-S3-EVO
juniper_networks	junos_os_evolved	>= 22.1 < 22.1*	22.1*
juniper_networks	junos_os_evolved	>= 22.2 < 22.2R3-S2-EVO	22.2R3-S2-EVO
juniper_networks	junos_os_evolved	>= 22.3 < 22.3R3-EVO	22.3R3-EVO
juniper_networks	junos_os_evolved	>= 22.4 < 22.4R1-S2-EVO, 22.4R2-EVO	22.4R1-S2-EVO, 22.4R2-EVO

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