Memory leak in Junos OS RE when handling IPv6 packets

1) Memory leak

EUVDB-ID: #VU82433

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-2020-1603

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to a crash the entire system.

Specific IPv6 packets sent by clients processed by the Routing Engine (RE) are improperly handled. These IPv6 packets are designed to be blocked by the RE from egressing the RE.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 16.1R - 19.3

CPE2.3

• cpe:2.3:o:juniper_networks:juniper_junos_os:16.1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:16.2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:17.1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:17.2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:17.3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:17.4:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:18.1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:18.2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:18.3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:18.4:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/s/article/2020-01-Security-Bulletin-Junos-OS-Improper-handling-of-specific-IPv6-packets-sent-by-clients-eventually-kernel-crash-vmcore-the-device-CVE-2020-1603

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.