Security Updates for Microsoft Exchange Server (March 2021)

critical Nessus Plugin ID 147003

Synopsis

The Microsoft Exchange Server installed on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft Exchange Server installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

- A remote code execution vulnerability. An attacker could exploit this to execute unauthorized arbitrary code. (CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078)

Solution

Microsoft has released the following security updates to address this issue:
-KB5000871

See Also

http://www.nessus.org/u?14b26c05

http://www.nessus.org/u?fedb98e4

Plugin Details

Severity: Critical

ID: 147003

File Name: smb_nt_ms21_mar_exchange_oob.nasl

Version: 1.13

Type: local

Agent: windows

Published: 3/3/2021

Updated: 4/4/2022

Risk Information

VPR

Risk Factor: Critical

Score: 9.8

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 Score Source: CVE-2021-26855

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:exchange_server

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/2/2021

Vulnerability Publication Date: 3/2/2021

CISA Known Exploited Dates: 4/16/2021

Exploitable With

Metasploit (Microsoft Exchange ProxyLogon RCE)

Reference Information

CVE: CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078

MSKB: 5000871

MSFT: MS21-5000871

IAVA: 2021-A-0111-S

CISA-NCAS: AA22-011A