title: Junos OS: SRX Series and MX Series: SIP ALG doesn't drop specifically malformed retransmitted SIP packets
description:
An Improper Check for Unusual or Exceptional Conditions vulnerability in the SIP ALG of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated network-based attacker to cause an integrity impact in connected networks.
If the SIP ALG is configured and a device receives a specifically malformed SIP packet, the device prevents this packet from being forwarded, but any subsequently received retransmissions of the same packet are forwarded as if they were valid.
This issue affects Juniper Networks Junos OS on SRX Series and MX Series:
*  20.4 versions prior to 20.4R3-S5;
*  21.1 versions prior to 21.1R3-S4;
*  21.2 versions prior to 21.2R3-S4;
*  21.3 versions prior to 21.3R3-S3;
*  21.4 versions prior to 21.4R3-S2;
*  22.1 versions prior to 22.1R2-S2, 22.1R3;
*  22.2 versions prior to 22.2R2-S1, 22.2R3;
*  22.3 versions prior to 22.3R1-S2, 22.3R2.
This issue doesn't not affected releases prior to 20.4R1.
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
defaultStatus: unaffected
platforms: [SRX Series, MX Series]
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S5, status: affected, version: 20.4, versionType: semver
lessThan: 21.1R3-S4, 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-S2, status: affected, version: 21.4, versionType: semver
lessThan: 22.1R2-S2, 22.1R3, status: affected, version: 22.1, versionType: semver
lessThan: 22.2R2-S1, 22.2R3, status: affected, version: 22.2, versionType: semver
lessThan: 22.3R1-S2, 22.3R2, status: affected, version: 22.3, versionType: semver
lessThan: 20.4R1, status: affected, version: 0, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.8
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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-S5, 21.1R3-S4, 21.2R3-S4, 21.3R3-S3, 21.4R3-S2, 22.1R2-S2, 22.1R3, 22.2R2-S1, 22.2R3, 22.3R1-S2, 22.3R2, 22.4R1, and all subsequent releases.
workarounds: There are no known workarounds for this issue.