Unpassworded 'bash' Backdoor Account

critical Nessus Plugin ID 15583
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 host has an account with a blank password.

Description

The account 'bash' has no password set. An attacker may use it to gain further privileges on this system.

This account was likely created by a backdoor installed by a fake Linux RedHat patch.

Solution

Disable this account and check your system.

See Also

http://www.nessus.org/u?231c3c89

Plugin Details

Severity: Critical

ID: 15583

File Name: account_bash.nasl

Version: 1.28

Type: remote

Family: Backdoors

Published: 10/30/2004

Updated: 6/14/2018

Dependencies: find_service1.nasl, account_check.nasl, ssh_detect.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.6

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

Temporal Vector: CVSS2#E:F/RL:TF/RC:ND

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.2

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

Temporal Vector: CVSS:3.0/E:F/RL:T/RC:X

Vulnerability Information

Excluded KB Items: global_settings/supplied_logins_only

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 1/1/2001

Exploitable With

Metasploit (SSH User Code Execution)

Reference Information

CVE: CVE-1999-0502