Resource management error in Junos OS - CVE-2019-0048
Published: July 11, 2019
Vulnerability identifier: #VU19144
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2019-0048
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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
Affected software
Junos OS
How to mitigate CVE-2019-0048
Install updates from vendor's website.
Junos OS - addressed in versions 14.1X53-D51, 14.1X53-D115, 17.1R3, 17.2R3-S2, 17.3R3-S3, 17.4R2-S5, 17.4R3, 18.1R3-S1, 18.2R2, 18.3R2