title: Junos OS: MX Series and SRX Series: The flow processing daemon (flowd) will crash if SIP ALG is enabled and a malformed SIP packet is received
description: A Buffer Overflow vulnerability in SIP ALG of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS). On all MX Series and SRX Series platform with SIP ALG enabled, when a malformed SIP packet is received, the flow processing daemon (flowd) will crash and restart. This issue affects: Juniper Networks Junos OS on MX Series and SRX Series 20.4 versions prior to 20.4R3-S5; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S2; 21.3 versions prior to 21.3R3-S1; 21.4 versions prior to 21.4R3; 22.1 versions prior to 22.1R1-S2, 22.1R2; 22.2 versions prior to 22.2R1-S1, 22.2R2. This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1 on SRX Series.
problem types: CWE-120 Buffer Overflow
affected:
{
vendor: Juniper Networks
product: Junos OS
versions:
version: unspecified, lessThan: 20.4R1, status: unaffected, versionType: custom
version: 20.4, status: affected, lessThan: 20.4R3-S5, versionType: custom
version: 21.1, status: affected, lessThan: 21.1R3-S4, versionType: custom
version: 21.2, status: affected, lessThan: 21.2R3-S2, versionType: custom
version: 21.3, status: affected, lessThan: 21.3R3-S1, versionType: custom
version: 21.4, status: affected, lessThan: 21.4R3, versionType: custom
version: 22.1, status: affected, lessThan: 22.1R1-S2, 22.1R2, versionType: custom
version: 22.2, status: affected, lessThan: 22.2R1-S1, 22.2R2, versionType: custom
platforms: MX Series, SRX Series
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
]
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: 20.4R3-S5, 21.1R3-S4, 21.2R3-S2, 21.3R3-S1, 21.4R3, 22.1R1-S2, 22.1R2, 22.2R1-S1, 22.2R2, 22.3R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue, but it should be considered to disable the SIP ALG if it's not strictly needed.