CVE-2019-0055 Denial of service in Junos OS

High 7.5 Published 9 Oct 2019 Updated 16 Sep 2024

An attacker can crash the flowd process and cause a sustained Denial of Service on Juniper SRX devices by sending specific valid SIP traffic when SIP ALG is enabled.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-0055?

CVE-2019-0055 is a high-severity denial of service vulnerability in Juniper Junos, published on 9 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the SIP ALG packet processing service of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) to the device by sending specific types of valid SIP traffic to the device. In this case, the flowd process crashes and generates a core dump while processing SIP ALG traffic. Continued receipt of these valid SIP packets will result in a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 12.3X48 versions prior to 12.3X48-D61, 12.3X48-D65 on SRX Series; 15.1X49 versions prior to 15.1X49-D130 on SRX Series; 17.3 versions prior to 17.3R3 on SRX Series; 17.4 versions prior to 17.4R2 on SRX Series.

Weakness: CWE-130

Which versions are affected by CVE-2019-0055?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2019-0055?

No fix has been published for CVE-2019-0055 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-0055 being exploited?

There is no known exploitation of CVE-2019-0055 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-vp5m-4998-8g6p.