#VU21758 Input validation error in Juniper Junos OS - CVE-2019-0064

Vulnerability identifier: #VU21758

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-0064

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing TCP packets if "set security zones security-zone <zone> tcp-rst" is configured. A remote attacker can send a specially crafted TCP packet, crash the flowd process and cause a denial of service on the target system.

Note: This vulnerability affects only Junos OS on SRX 5000 Series.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 18.2R3, 18.4R2, 19.2R1

---

External links
https://kb.juniper.net/JSA10963

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.