OpenSSH 6.8p1 - 7.x < 7.1p2 ssh_packet_read_poll2() Packet Handling DoS

medium Nessus Plugin ID 90924
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The SSH server running on the remote host is affected by a denial of service vulnerability.

Description

According to its banner, the version of OpenSSH running on the remote host is 6.x equal to or greater than 6.8p1 or 7.x prior to 7.1p2. It is, therefore, affected by a denial of service vulnerability due to an out-of-bounds read error that occurs when handling packets. A remote attacker can exploit this to crash the service or disclose memory contents.

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

Solution

Upgrade to OpenSSH version 7.1p2 or later.

See Also

http://www.openssh.com/txt/release-7.1p2

Plugin Details

Severity: Medium

ID: 90924

File Name: openssh_71p2.nasl

Version: 1.5

Type: remote

Family: Misc.

Published: 5/5/2016

Updated: 11/20/2019

Dependencies: ssh_detect.nasl

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2016-1907

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

CVSS v3

Risk Factor: Medium

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:N/A:L

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 1/14/2016

Vulnerability Publication Date: 1/14/2016

Reference Information

CVE: CVE-2016-1907

BID: 81293