#VU21755 Input validation error in Juniper Junos OS - CVE-2019-0067

Vulnerability identifier: #VU21755

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-0067

CWE-ID: CWE-20

Exploitation vector: Local 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 receipt of a specific link-local IPv6 packet destined to the RE. A remote attacker on adjacent network can send a specially crafted IPv6 packet, repeatedly crash the system and restart (vmcore) and cause a prolonged denial of service condition on the target system.

Note: This issue affects Junos OS devices with Multi-Chassis Link Aggregation Group (MC-LAG) enabled.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 16.1R - 16.1R6, 16.2R1-S1 - 16.2R2, 17.1R1-S1 - 17.1R3-S1

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External links
https://kb.juniper.net/JSA10966

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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