Vulnerability identifier: #VU6126

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor: OpenSSH

Description

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

The vulnerability exists due to incomplete fix of CBC padding oracle countermeasures, allowing a variant of the attack fixed in OpenSSH 7.3 (SB2016080201 #3). A remote attacker can force the ssh client to use weak CBC ciphers and decrypt ssh session.

Successful exploitation of the vulnerability may allow an attacker to gain access to potentially sensitive information.

Mitigation
Update to version 7.5.

Vulnerable software versions

OpenSSH: 7.0p1 - 7.4p1

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External links
http://www.openssh.com/txt/release-7.5

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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.