title: Junos OS: SRX 5000 Series: Repeated execution of a specific CLI command causes a flowd crash
description:
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper Networks Junos OS allows authenticated, low privileged, local attacker to cause a Denial of Service (DoS).
On an SRX 5000 Series device, when executing a specific command repeatedly, memory is corrupted, which leads to a Flow Processing Daemon (flowd) crash.
The NSD process has to be restarted to restore services.
If this issue occurs, it can be checked with the following command:
user@host> request security policies check
The following log message can also be observed:
Error: policies are out of sync for PFE node<number>.fpc<number>.pic<number>.
This issue affects:
Juniper Networks Junos OS on SRX 5000 Series
*  All versions earlier than 20.4R3-S6;
*  21.1 versions earlier than 21.1R3-S5;
*  21.2 versions earlier than 21.2R3-S4;
*  21.3 versions earlier than 21.3R3-S3;
*  21.4 versions earlier than 21.4R3-S3;
*  22.1 versions earlier than 22.1R3-S1;
*  22.2 versions earlier than 22.2R3;
*  22.3 versions earlier than 22.3R2.
problem types: CWE-122 Heap-based Buffer Overflow
affected:
{
defaultStatus: unaffected
platforms: SRX 5000 Series
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S6, status: affected, version: 0, versionType: semver
lessThan: 21.1R3-S5, status: affected, version: 21.1, versionType: semver
lessThan: 21.2R3-S4, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S3, status: affected, version: 21.3, versionType: semver
lessThan: 21.4R3-S3, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R3-S1, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R3, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R2, status: affected, version: 22.3, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 5.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
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 20.4R3-S6, 21.1R3-S5, 21.2R3-S4, 21.3R3-S3, 21.3R3-S4, 21.4R3-S3, 22.1R3-S1, 22.2R3, 22.3R2, 22.4R1, 22.4R2, 23.1R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.