Microsoft Windows SMBv3 Compression RCE (ADV200005)(CVE-2020-0796)(Remote)

critical Nessus Plugin ID 135177
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 Windows host is using a vulnerable version of SMB.

Description

A remote code execution vulnerability exists in Microsoft Server Message Block 3.1.1 (SMBv3) protocol due to how it handles a maliciously crafted compressed data packet. An unauthenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands.

Note that this plugin works only if it can to connect to the IPC$ share anonymously using SMB dialect 3.1.1.

Solution

Apply Cumulative Update KB4551762.

See Also

http://www.nessus.org/u?32926bb8

Plugin Details

Severity: Critical

ID: 135177

File Name: microsoft_smb_cve-2020-0796.nasl

Version: 1.4

Type: remote

Agent: windows

Family: Windows

Published: 4/2/2020

Updated: 9/3/2020

Dependencies: smb_dialects_enabled.nasl, os_fingerprint.nasl, samba_detect.nasl

Risk Information

CVSS Score Source: CVE-2020-0796

VPR

Risk Factor: Critical

Score: 10

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: E:H/RL:OF/RC:C

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9.5

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

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/smb_dialect/3.1.1/compression

Excluded KB Items: SMB/samba

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/12/2020

Vulnerability Publication Date: 3/12/2020

Exploitable With

CANVAS (CANVAS)

Metasploit (SMBv3 Compression Buffer Overflow)

Reference Information

CVE: CVE-2020-0796

MSKB: 4551762

MSFT: MS20-4551762