Vulnerability identifier: #VU5889

Vulnerability risk: High

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2015-7756

CWE-ID: CWE-327

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper ScreenOS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description
The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists due to usage of insecure encryption keys. A remote attacker can with ability to monitor VPN traffic can intercept and decrypt it.

Successful exploitation of the vulnerability results in information disclosure on the target system.

Note: the vulnerability was disclosed as part of two backdoors during internal source code audit.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Juniper ScreenOS: 6.2.0r15 - 6.3.0r20

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713&actp=search

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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. However, a fully functional exploit for this vulnerability is available.