SB2019071118 - Resource management error in Juniper Junos OS
Published: July 11, 2019
Security Bulletin ID
SB2019071118
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource management error (CVE-ID: CVE-2019-0048)
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
Remediation
Install update from vendor's website.