CVE-2021-31378
Assigner: juniper
Published: 2021-10-13T00:00:00
State: PUBLISHED
affected: product: Junos OS
vendor: Juniper Networks
versions: lessThan: 17.3R3-S12
status: affected
version: 17.3
versionType: custom
lessThan: 17.4R3-S5
status: affected
version: 17.4
versionType: custom
lessThan: 18.1R3-S13
status: affected
version: 18.1
versionType: custom
lessThan: 18.2R3-S8
status: affected
version: 18.2
versionType: custom
lessThan: 18.3R3-S5
status: affected
version: 18.3
versionType: custom
lessThan: 18.4R2-S8, 18.4R3-S9
status: affected
version: 18.4
versionType: custom
lessThan: 19.1R3-S6
status: affected
version: 19.1
versionType: custom
lessThan: 19.2R1-S7, 19.2R3-S3
status: affected
version: 19.2
versionType: custom
lessThan: 19.3R2-S6, 19.3R3-S3
status: affected
version: 19.3
versionType: custom
lessThan: 19.4R1-S4, 19.4R1-S4, 19.4R3-S3
status: affected
version: 19.4
versionType: custom
lessThan: 20.1R3
status: affected
version: 20.1
versionType: custom
lessThan: 20.2R3-S1
status: affected
version: 20.2
versionType: custom
lessThan: 20.3R3
status: affected
version: 20.3
versionType: custom
lessThan: 20.4R3
status: affected
version: 20.4
versionType: custom
lessThan: 21.1R2
status: affected
version: 21.1
versionType: custom
lessThan: 12.3*
status: unaffected
version: 12.3R1
versionType: custom
lessThan: 15.1*
status: unaffected
version: 15.1R1
versionType: custom
configurations: value: The following minimum system configuration is necessary to be potentially exposed to this issue: 

* In broadband environments
* In Enhanced Subscriber Management environment (i.e., "system services subscriber-management enable" is configured) 
* RADIUS server is configured for subscriber access (i.e., define RADIUS server at "access radius-server" or "access profile <> radius-server" hierarchy level)
 
datePublic: 2021-10-13T00:00:00
descriptions: value: In broadband environments, including but not limited to Enhanced Subscriber Management, (CHAP, PPP, DHCP, etc.), on Juniper Networks Junos OS devices where RADIUS servers are configured for managing subscriber access and a subscriber is logged in and then requests to logout, the subscriber may be forced into a "Terminating" state by an attacker who is able to send spoofed messages appearing to originate from trusted RADIUS server(s) destined to the device in response to the subscriber's request. These spoofed messages cause the Junos OS General Authentication Service (authd) daemon to force the broadband subscriber into this "Terminating" state which the subscriber will not recover from thereby causing a Denial of Service (DoS) to the endpoint device. Once in the "Terminating" state, the endpoint subscriber will no longer be able to access the network. Restarting the authd daemon on the Junos OS device will temporarily clear the subscribers out of the "Terminating" state. As long as the attacker continues to send these spoofed packets and subscribers request to be logged out, the subscribers will be returned to the "Terminating" state thereby creating a persistent Denial of Service to the subscriber. An indicator of compromise may be seen by displaying the output of "show subscribers summary". The presence of subscribers in the "Terminating" state may indicate the issue is occurring. This issue affects: Juniper Networks Junos OS 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S8, 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R1-S4, 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. This issue does not affect: Juniper Networks Junos OS 12.3 version 12.3R1 and later versions; 15.1 version 15.1R1 and later versions.
exploits: value: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
metrics: cvssV3_1: attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 6.8
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
version: 3.1
problemTypes: descriptions: cweId: CWE-772
description: CWE-772: Missing Release of Resource after Effective Lifetime
type: CWE
descriptions: description: Denial of Service (DoS)
type: text
solutions: value: The following software releases have been updated to resolve this specific issue: 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R2-S8, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R1-S4, 19.4R3-S3, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R3, 21.1R2, 21.2R1, and all subsequent releases.



source: advisory: JSA11246
defect: 1583090
discovery: USER
title: Junos OS: An attacker sending spoofed RADIUS messages to a Junos OS device configured for broadband services may cause broadband subscribers to remain stuck in a "Terminating" state.
workarounds: value: There are no viable workarounds for this issue.
x_generator: engine: Vulnogram 0.0.9