Vulnerability Monitor

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CVE-2024-21585

An Improper Handling of Exceptional Conditions vulnerability in BGP session processing of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker, using specific timing outside the attacker's control, to flap BGP sessions and cause the routing protocol daemon (rpd) process to crash and restart, leading to a Denial of Service (DoS) condition. Continued BGP session flapping will create a sustained Denial of Service (DoS) condition. This issue only affects routers configured with non-stop routing (NSR) enabled. Graceful Restart (GR) helper mode, enabled by default, is also required for this issue to be exploitable. Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability. When the BGP session flaps on the NSR-enabled router, the device enters GR-helper/LLGR-helper mode due to the peer having negotiated GR/LLGR-restarter capability and the backup BGP requests for replication of the GR/LLGR-helper session, master BGP schedules, and initiates replication of GR/LLGR stale routes to the backup BGP. In this state, if the BGP session with the BGP peer comes up again, unsolicited replication is initiated for the peer without cleaning up the ongoing GR/LLGR-helper mode replication. This parallel two instances of replication for the same peer leads to the assert if the BGP session flaps again. This issue affects: Juniper Networks Junos OS * All versions earlier than 20.4R3-S9; * 21.2 versions earlier than 21.2R3-S7; * 21.3 versions earlier than 21.3R3-S5; * 21.4 versions earlier than 21.4R3-S5; * 22.1 versions earlier than 22.1R3-S4; * 22.2 versions earlier than 22.2R3-S3; * 22.3 versions earlier than 22.3R3-S1; * 22.4 versions earlier than 22.4R2-S2, 22.4R3; * 23.2 versions earlier than 23.2R1-S1, 23.2R2. Juniper Networks Junos OS Evolved * All versions earlier than 21.3R3-S5-EVO; * 21.4 versions earlier than 21.4R3-S5-EVO; * 22.1 versions earlier than 22.1R3-S4-EVO; * 22.2 versions earlier than 22.2R3-S3-EVO; * 22.3 versions earlier than 22.3R3-S1-EVO; * 22.4 versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO; * 23.2 versions earlier than 23.2R1-S1-EVO, 23.2R2-EVO.

Published

2024-01-12T01:15:46.053

Last Modified

2024-11-21T08:54:39.697

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.9 (MEDIUM)

Weaknesses

Type: Secondary
CWE-755
Type: Primary
CWE-755

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	20.4	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.2	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.3	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	21.4	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.1	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.2	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.3	Yes
Operating System	juniper	junos	22.4	Yes
Operating System	juniper	junos	22.4	Yes
Operating System	juniper	junos	22.4	Yes
Operating System	juniper	junos	22.4	Yes
Operating System	juniper	junos	22.4	Yes
Operating System	juniper	junos	22.4	Yes
Operating System	juniper	junos	23.2	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.3	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	21.4	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.1	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.2	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.3	Yes
Operating System	juniper	junos_os_evolved	22.4	Yes
Operating System	juniper	junos_os_evolved	22.4	Yes
Operating System	juniper	junos_os_evolved	22.4	Yes
Operating System	juniper	junos_os_evolved	22.4	Yes
Operating System	juniper	junos_os_evolved	22.4	Yes
Operating System	juniper	junos_os_evolved	22.4	Yes
Operating System	juniper	junos_os_evolved	23.2	Yes
Operating System	juniper	junos_os_evolved	23.2	Yes
Operating System	juniper	junos_os_evolved	23.2	Yes

References

https://supportportal.juniper.net/JSA75723 Vendor Advisory ([email protected])
https://supportportal.juniper.net/s/article/MX-GR-and-LLGR-capability-and-compatibility-changes-after-15-1-release Vendor Advisory ([email protected])
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L Third Party Advisory ([email protected])
https://supportportal.juniper.net/JSA75723 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://supportportal.juniper.net/s/article/MX-GR-and-LLGR-capability-and-compatibility-changes-after-15-1-release Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)