OpenSSH < 5.7 Multiple Vulnerabilities

Medium Nessus Network Monitor Plugin ID 6300

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: PVS 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: 2012/02/01

Modified: 2016/06/15

Dependencies: 1997, 3059

Nessus ID: 44081

Risk Information

Risk Factor: Medium

CVSSv2

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

CVSSv3

Base Score: 5.6

Temporal Score: 4.9

Vector: CVSS3#AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Temporal Vector: CVSS3#E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Patch Publication Date: 2010/09/12

Vulnerability Publication Date: 2010/09/12

Reference Information

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

BID: 45304, 51702