Detections
Analytics
OpenSSH < 7.3 Multiple Vulnerabilities
high Nessus Plugin ID 93194
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Synopsis
The SSH server running on the remote host is affected by multiple vulnerabilities.Description
According to its banner, the version of OpenSSH running on the remote host is prior to 7.3. It is, therefore, affected by multiple vulnerabilities :- A local privilege escalation when the UseLogin feature is enabled and PAM is configured to read .pam_environment files from home directories. (CVE-2015-8325)
- A flaw exists that is due to the program returning shorter response times for authentication requests with overly long passwords for invalid users than for valid users. This may allow a remote attacker to conduct a timing attack and enumerate valid usernames.
(CVE-2016-6210)
- A denial of service vulnerability exists in the auth_password() function in auth-passwd.c due to a failure to limit password lengths for password authentication. An unauthenticated, remote attacker can exploit this, via a long string, to consume excessive CPU resources, resulting in a denial of service condition. (CVE-2016-6515)
- An unspecified flaw exists in the CBC padding oracle countermeasures that allows an unauthenticated, remote attacker to conduct a timing attack.
- A flaw exists due to improper operation ordering of MAC verification for Encrypt-then-MAC (EtM) mode transport MAC algorithms when verifying the MAC before decrypting any ciphertext. An unauthenticated, remote attacker can exploit this, via a timing attack, to disclose sensitive information.
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 7.3 or later.See Also
Plugin Details
Severity: High
ID: 93194
File Name: openssh_73.nasl
Version: 1.11
Type: remote
Family: Misc.
Published: 8/29/2016
Updated: 3/27/2024
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2016-6515
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 7
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:openbsd:openssh
Required KB Items: installed_sw/OpenSSH
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 8/1/2016
Vulnerability Publication Date: 8/1/2016