OpenSSH < 2.5.2 / 2.5.2p2 Multiple Information Disclosure Vulnerabilities

Medium Nessus Plugin ID 44068

Synopsis

Remote attackers may be able to infer information about traffic inside an SSH session.

Description

According to its banner, the remote host appears to be running a version of OpenSSH earlier than 2.5.2 / 2.5.2p2. It, therefore, reportedly contains weaknesses in its implementation of the SSH protocol, both versions 1 and 2. These weaknesses could allow an attacker to sniff password lengths, and ranges of length (this could make brute-force password guessing easier), determine whether RSA or DSA authentication is being used, the number of authorized_keys in RSA authentication and/or the length of shell commands.

Solution

Upgrade to OpenSSH 2.5.2 / 2.5.2p2 or later.

See Also

https://www.openwall.com/articles/SSH-Traffic-Analysis

http://www.openssh.com/txt/release-2.5.2p2

Plugin Details

Severity: Medium

ID: 44068

File Name: openssh_252.nasl

Version: 1.10

Type: remote

Family: Misc.

Published: 2011/10/04

Modified: 2018/11/15

Dependencies: 10267

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

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

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2001/03/19

Vulnerability Publication Date: 2001/03/19

Reference Information

CVE: CVE-2001-0361, CVE-2001-0572

BID: 2344, 49473

CERT: 596827

CWE: 310