Information disclosure in Junos OS on EX4300 and MX204 routers

1) Information disclosure

EUVDB-ID: #VU88976

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1628

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output. A remote attacker can access heartbeats, kernel versions, etc. out to the Internet if the 128.0.0.0/2 subnet is sued for internal communications between the RE and PFEs.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 14.1R1 - 22.1R1-S2

External links

http://supportportal.juniper.net/s/article/2020-04-Security-Bulletin-Junos-OS-EX4300-and-MX204-Traffic-from-the-network-internal-to-the-device-128-0-0-0-may-be-forwarded-to-egress-interfaces-CVE-2020-1628

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.