OpenSSH < 7.6 Security Bypass

Medium Nessus Network Monitor Plugin ID 701159

Synopsis

The remote SSH server may be affected by a security bypass vulnerability.

Description

The installed version of OpenSSH is prior to 7.6 and is affected by a vulnerability in the 'process_open' function that does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.

Solution

Upgrade to OpenSSH 7.x version 7.6 or later.

See Also

http://www.openssh.com/txt/release-7.6

Plugin Details

Severity: Medium

ID: 701159

Family: SSH

Published: 2019/08/21

Updated: 2019/08/21

Dependencies: 1997

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Patch Publication Date: 2017/10/13

Vulnerability Publication Date: 2017/10/13

Reference Information

CVE: CVE-2017-15906

BID: 101552