Piriform CCleaner 5.33.6162 Backdoor

critical Nessus Plugin ID 103302
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

A system maintenance application installed on the remote host is affected by a malicious backdoor.

Description

The version of Piriform CCleaner installed on the remote Windows host is equal to 5.33.6162. It is, therefore, affected by a malicious backdoor in CCleaner.exe that allows remote attackers to obtain sensitive information and install unauthorized software.

Solution

Upgrade to a version of Piriform CCleaner that is equal to or later than 5.34.

See Also

http://www.nessus.org/u?2c629f18

http://www.nessus.org/u?bdc90ffd

Plugin Details

Severity: Critical

ID: 103302

File Name: ccleaner_5_34.nasl

Version: 1.8

Type: local

Family: Backdoors

Published: 9/18/2017

Updated: 11/15/2018

Dependencies: ccleaner_installed.nbin

Risk Information

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

Temporal Vector: E:F/RL:OF/RC:ND

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

Temporal Vector: E:F/RL:O/RC:X

Vulnerability Information

CPE: cpe:/a:piriform:ccleaner

Required KB Items: installed_sw/CCleaner, SMB/Registry/Enumerated, SMB/ARCH

Patch Publication Date: 9/18/2017

Vulnerability Publication Date: 9/18/2017