Resource management error in Juniper Junos OS - CVE-2019-0048
Published: July 11, 2019
Vulnerability identifier: #VU19144
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-0048
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Juniper Junos OS
Juniper Junos OS
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to incoming multicast traffic matches an implicit loopback filter rule first, since it has high priority. Due to this bug, when a firewall filter is applied on the loopback interface, other firewall filters might stop working for multicast traffic. A remote attacker can send a specially crafted request to the loopback interface to stop other firewall filters work.
This issue only affects the EX4300 switch with TCAM optimization enabled:-
set system packet-forwarding-options tcam-group-optimization
How to mitigate CVE-2019-0048
Install updates from vendor's website.