Denial of service when processing BGP messages in Junos OS and Junos OS Evolved

1) Input validation error

EUVDB-ID: #VU49553

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-2021-0211

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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 BGP mesages. A remote attacker can send a valid BGP FlowSpec message and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.3R1-EVO - 20.4

Juniper Junos OS: 15.1F2-S1 - 20.4

CPE2.3

• cpe:2.3:o:juniper_networks:junos_os_evolved:20.3R1-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:20.3R1-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:20.3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:20.3-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:20.4:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:15.1F2-S1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:15.1F2-S2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:15.1F2-S3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:15.1F2-S4:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:15.1F2-S5:*:*:*:*:*:*:*

External links

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11101&cat=SIRT_1&actp=LIST

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.