title: Junos OS: Specially crafted packets sent to port 111 on any interface triggers responses from the management interface
description: On Junos OS, rpcbind should only be listening to port 111 on the internal routing instance (IRI). External packets destined to port 111 should be dropped. Due to an information leak vulnerability, responses were being generated from the source address of the management interface (e.g. fxp0) thus disclosing internal addressing and existence of the management interface itself. A high rate of crafted packets destined to port 111 may also lead to a partial Denial of Service (DoS). Note: Systems with fxp0 disabled or unconfigured are not vulnerable to this issue. This issue only affects Junos OS releases based on FreeBSD 10 or higher (typically Junos OS 15.1+). Administrators can confirm whether systems are running a version of Junos OS based on FreeBSD 10 or higher by typing: user@junos> show version | match kernel JUNOS OS Kernel 64-bit [20181214.223829_fbsd-builder_stable_10] Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F6-S12, 15.1R7-S4; 15.1X53 versions prior to 15.1X53-D236; 16.1 versions prior to 16.1R7-S1; 16.2 versions prior to 16.2R2-S9; 17.1 versions prior to 17.1R3; 17.2 versions prior to 17.2R1-S8; 17.3 versions prior to 17.3R2; 17.4 versions prior to 17.4R1-S1, 17.4R1-S7, 17.4R2. This issue does not affect Junos OS releases prior to 15.1.
problem types: CWE-200 Information Exposure
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1F6-S12, 15.1R7-S4, status: affected, version: 15.1, versionType: custom
lessThan: 15.1X53-D236, status: affected, version: 15.1X53, versionType: custom
lessThan: 16.1R7-S1, status: affected, version: 16.1, versionType: custom
lessThan: 16.2R2-S9, status: affected, version: 16.2, versionType: custom
lessThan: 17.1R3, status: affected, version: 17.1, versionType: custom
lessThan: 17.2R1-S8, status: affected, version: 17.2, versionType: custom
lessThan: 17.3R2, status: affected, version: 17.3, versionType: custom
lessThan: 17.4R1-S1, 17.4R1-S7, 17.4R2, status: affected, version: 17.4, versionType: custom
lessThan: 15.1, status: unaffected, version: all, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
version: 3.0
]
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 15.1F6-S12, 15.1R7-S4, 15.1X53-D236, 16.1R7-S1, 16.2R2-S9, 17.1R3, 17.2R1-S8, 17.2R3, 17.3R2, 17.4R1-S1, 17.4R1-S7, 17.4R2, 18.1R1, 18.1X75-D10, and all subsequent releases.
workarounds: Use access lists or firewall filters to limit access to port 111 on the device.