title: Junos OS: SRX Series: A flowd core will be observed when malformed GPRS traffic is processed
description: An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based, attacker to cause Denial of Service (DoS). A PFE crash will happen when a GPRS Tunnel Protocol (GTP) packet is received with a malformed field in the IP header of GTP encapsulated General Packet Radio Services (GPRS) traffic. The packet needs to match existing state which is outside the attackers control, so the issue cannot be directly exploited. The issue will only be observed when endpoint address validation is enabled. This issue affects Juniper Networks Junos OS on SRX Series: 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S4; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3-S2; 21.2 versions prior to 21.2R3-S1; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R1-S2, 21.4R2; 22.1 versions prior to 22.1R1-S1, 22.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 20.2R1.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 20.2R1, status: unaffected, versionType: custom
version: 20.2, status: affected, lessThan: 20.2R3-S5, versionType: custom
version: 20.3, status: affected, lessThan: 20.3R3-S4, versionType: custom
version: 20.4, status: affected, lessThan: 20.4R3-S3, versionType: custom
version: 21.1, status: affected, lessThan: 21.1R3-S2, versionType: custom
version: 21.2, status: affected, lessThan: 21.2R3-S1, versionType: custom
version: 21.3, status: affected, lessThan: 21.3R3, versionType: custom
version: 21.4, status: affected, lessThan: 21.4R1-S2, 21.4R2, versionType: custom
version: 22.1, status: affected, lessThan: 22.1R1-S1, 22.1R2, versionType: custom
platforms: SRX Series
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: NETWORK
attackComplexity: HIGH
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 5.9
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: 20.2R3-S5, 20.3R3-S4, 20.4R3-S3, 21.1R3-S2, 21.2R3-S1, 21.3R3, 21.4R1-S2, 21.4R2, 22.1R1-S1, 22.1R2, 22.2R1, and all subsequent releases.
workarounds: This issue can be temporarily mitigated by disabling the end-point-address-validated security feature.