CVE-2019-0033

SRX Series: A remote attacker may cause a high CPU Denial of Service to the device when proxy ARP is configured.

Description

A firewall bypass vulnerability in the proxy ARP service of Juniper Networks Junos OS allows an attacker to cause a high CPU condition leading to a Denial of Service (DoS). This issue affects only IPv4. Affected releases are Juniper Networks Junos OS: 12.1X46 versions above and including 12.1X46-D25 prior to 12.1X46-D71, 12.1X46-D73 on SRX Series; 12.3X48 versions prior to 12.3X48-D50 on SRX Series; 15.1X49 versions prior to 15.1X49-D75 on SRX Series.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: 12.1X46-D71, 12.1X46-D73, 12.3X48-D50, 15.1X49-D75, 17.3R1, and all subsequent releases.

Workaround:

  • Discontinue use of proxy ARP. An example configuration snippet is below: deactivate security nat proxy-arp interface ge-0/0/0.0 address 2.2.2.5/32 (or) delete security nat proxy-arp interface ge-0/0/0.0 address 2.2.2.5/32 There are no other viable workarounds for this issue.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.49%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://kb.juniper.net/JSA10922 mitigation vendor advisory
http://www.securityfocus.com/bid/107882 vdb entry

Frequently Asked Questions

What is the severity of CVE-2019-0033?
CVE-2019-0033 has been scored as a high severity vulnerability.
How to fix CVE-2019-0033?
To fix CVE-2019-0033: The following software releases have been updated to resolve this specific issue: 12.1X46-D71, 12.1X46-D73, 12.3X48-D50, 15.1X49-D75, 17.3R1, and all subsequent releases.
Is CVE-2019-0033 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-0033 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-0033?
CVE-2019-0033 affects Juniper Networks Junos OS.
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