OpenSSH < 7.6

Medium Nessus Plugin ID 103781

Synopsis

The SSH server running on the remote host is affected by a file creation restriction bypass vulnerability.

Description

According to its banner, the version of OpenSSH running on the remote host is prior to 7.6. It is, therefore, affected by a file creation restriction bypass vulnerability related to the 'process_open' function in the file 'sftp-server.c' that allows authenticated users to create zero-length files regardless of configuration.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to OpenSSH version 7.6 or later.

See Also

http://www.nessus.org/u?09ca048b

http://www.nessus.org/u?96a8ea52

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

Plugin Details

Severity: Medium

ID: 103781

File Name: openssh_76.nasl

Version: 1.8

Type: remote

Family: Misc.

Published: 2017/10/11

Updated: 2019/11/12

Dependencies: 10267

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2017-15906

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

Required KB Items: Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2017/10/03

Vulnerability Publication Date: 2017/10/04

Reference Information

CVE: CVE-2017-15906

BID: 101552