title: Junos OS and Junos OS Evolved: In an SR to LDP interworking scenario, with SRMS, when a specific low privileged command is issued on an ABR rpd will crash
description: An Unchecked Return Value to NULL Pointer Dereference vulnerability in Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a locally authenticated attacker with low privileges to cause a Denial of Service (DoS). In Segment Routing (SR) to Label Distribution Protocol (LDP) interworking scenario, configured with Segment Routing Mapping Server (SRMS) at any node, when an Area Border Router (ABR) leaks the SRMS entries having "S" flag set from IS-IS Level 2 to Level 1, an rpd core might be observed when a specific low privileged CLI command is issued. This issue affects: Juniper Networks Junos OS 21.4 versions prior to 21.4R1-S2, 21.4R2-S1, 21.4R3; 22.1 versions prior to 22.1R2. Juniper Networks Junos OS Evolved 21.4-EVO versions prior to 21.4R1-S2-EVO, 21.4R2-S1-EVO, 21.4R3-EVO; 22.1-EVO versions prior to 22.1R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 21.4R1. Juniper Networks Junos OS Evolved versions prior to 21.4R1-EVO.
problem types: CWE-690 Unchecked Return Value to NULL Pointer Dereference
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 21.4R1, status: unaffected, versionType: custom
version: 21.4, status: affected, lessThan: 21.4R1-S2, 21.4R2-S1, 21.4R3, versionType: custom
version: 22.1, status: affected, lessThan: 22.1R2, versionType: custom
}
{
vendor: Juniper Networks
product: Junos OS Evolved
versions:
version: unspecified, lessThan: 21.4R1-EVO, status: unaffected, versionType: custom
version: 21.4-EVO, status: affected, lessThan: 21.4R1-S2-EVO, 21.4R2-S1-EVO, 21.4R3-EVO, versionType: custom
version: 22.1-EVO, status: affected, lessThan: 22.1R2-EVO, versionType: custom
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
attackVector: LOCAL
attackComplexity: LOW
privilegesRequired: LOW
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 5.5
baseSeverity: MEDIUM
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue:
Junos OS: 21.4R1-S2, 21.4R2-S1, 21.4R3, 22.1R2, 22.2R1 and all subsequent releases.
Junos OS Evolved: 21.4R1-S2-EVO, 21.4R2-S1-EVO, 21.4R3-EVO, 22.1R2-EVO, 22.2R1-EVO and all subsequent releases.
workarounds: There are no known workarounds for this issue.
To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks, hosts and users.