Vulnerability identifier: #VU7541

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-2342

CWE-ID: CWE-200

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 obtain potentially sensitive information.

The weakness exists due to the system falls back to an unencrypted link when MACsec is configured on a port that is not capable of MACsec or when a secure link can not be established. A remote attacker that can monitor the network can view potentially sensitive information on the target link.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
The vulnerability is addressed in the following versions:
15.1X49-D100.

Vulnerable software versions

Juniper Junos OS: 15.1X49 - 15.1X49-D50

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10790

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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 Internet.

Is there known malware, which exploits this vulnerability?

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