CVE-2024-39547

published 2024-10-11

CVE-2024-39547: An Improper Handling of Exceptional Conditions vulnerability in the rpd-server of Juniper Networks Junos OS and Junos OS Evolved within cRPD allows an…

high 8.7 CVSS 4.0

AV N AC L AT N PR N UI N VC N VI N VA H SC N SI N SA L E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU Y R U V X RE X U X

An Improper Handling of Exceptional Conditions vulnerability in the rpd-server of Juniper Networks Junos OS and Junos OS Evolved within cRPD allows an unauthenticated network-based attacker sending crafted TCP traffic to the routing engine (RE) to cause a CPU-based Denial of Service (DoS).

If specially crafted TCP traffic is received by the control plane, or a TCP session terminates unexpectedly, it will cause increased control plane CPU utilization by the rpd-server process.

While not explicitly required, the impact is more severe when RIB sharding is enabled.

Task accounting shows unexpected reads by the RPD Server jobs for shards:

user@junos> show task accounting detail
...
read:RPD Server.0.0.0.0+780.192.168.0.78+48886 TOT:00000003.00379787 MAX:00000000.00080516 RUNS: 233888\
read:RPD Server.0.0.0.0+780.192.168.0.78+49144 TOT:00000004.00007565 MAX:00000000.00080360 RUNS: 233888\
read:RPD Server.0.0.0.0+780.192.168.0.78+49694 TOT:00000003.00600584 MAX:00000000.00080463 RUNS: 233888\
read:RPD Server.0.0.0.0+780.192.168.0.78+50246 TOT:00000004.00346998 MAX:00000000.00080338 RUNS: 233888\

This issue affects:

Junos OS with cRPD:

* All versions before 21.2R3-S8,
* 21.4 before 21.4R3-S7,
* 22.1 before 22.1R3-S6,
* 22.2 before 22.2R3-S4,
* 22.3 before 22.3R3-S3,
* 22.4 before 22.4R3-S2,
* 23.2 before 23.2R2-S2,
* 24.2 before 24.2R2;

Junos OS Evolved with cRPD:

* All versions before 21.4R3-S7-EVO,
* 22.2 before 22.2R3-S4-EVO,
* 22.3 before 22.3R3-S3-EVO,
* 22.4 before 22.4R3-S2-EVO,
* 23.2 before 23.2R2-EVO.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
juniper	junos_os	—	—
juniper_networks	junos_os	< 21.2R3-S8	21.2R3-S8
juniper_networks	junos_os	>= 21.4 < 21.4R3-S7	21.4R3-S7
juniper_networks	junos_os	>= 22.1 < 22.1R3-S6	22.1R3-S6
juniper_networks	junos_os	>= 22.2 < 22.2R3-S4	22.2R3-S4
juniper_networks	junos_os	>= 22.3 < 22.3R3-S3	22.3R3-S3
juniper_networks	junos_os	>= 22.4 < 22.4R3-S2	22.4R3-S2
juniper_networks	junos_os	>= 23.2 < 23.2R2-S2	23.2R2-S2
juniper_networks	junos_os	>= 24.2 < 24.2R2	24.2R2
juniper_networks	junos_os_evolved	< 21.4R3-S7-EVO	21.4R3-S7-EVO
juniper_networks	junos_os_evolved	>= 22.2-EVO < 22.2R3-S4-EVO	22.2R3-S4-EVO
juniper_networks	junos_os_evolved	>= 22.3-EVO < 22.3R3-S3-EVO	22.3R3-S3-EVO
juniper_networks	junos_os_evolved	>= 22.4-EVO < 22.4R3-S2-EVO	22.4R3-S2-EVO
juniper_networks	junos_os_evolved	>= 23.2-EVO < 23.2R2-EVO	23.2R2-EVO

CWE-755