OpenSSH < 5.7 Multiple Vulnerabilities

medium Nessus Network Monitor Plugin ID 6300
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 remote SSH service may be affected by multiple vulnerabilities.

Description

Versions of OpenSSH server before 5.7 may be affected by the following vulnerabilities :

- A security bypass vulnerability because OpenSSH does not properly validate the public parameters in the J-PAKE protocol. This could allow an attacker to authenticate without the shared secret. Note that this issue is only exploitable when OpenSSH is built with J-PAKE support, which is currently experimental and disabled by default. (CVE-2010-4478)

- The auth_parse options function in auth-options.c in sshd provides debug messages containing authorized_keys command options, which allows remote authenticated users to obtain potentially sensitive information by reading these messages. (CVE-2012-0841)

Note: NNM has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.

Solution

Upgrade to OpenSSH version 5.7 or later.

See Also

http://seb.dbzteam.org/crypto/jpake-session-key-retrieval.pdf

http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/jpake.c#rev1.5

Plugin Details

Severity: Medium

ID: 6300

Family: SSH

Published: 2/1/2012

Updated: 3/6/2019

Dependencies: 1997, 3059

Nessus ID: 44081

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

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

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.9

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

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

Vulnerability Information

CPE: cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

Patch Publication Date: 9/12/2010

Vulnerability Publication Date: 9/12/2010

Reference Information

CVE: CVE-2010-4478, CVE-2012-0814

BID: 45304, 51702