Security Updates for Exchange (November 2021)

high Nessus Plugin ID 154999

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 session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-41349, CVE-2021-42305)

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-42321)

Solution

Microsoft has released KB5007409 to address this issue.

See Also

https://support.microsoft.com/en-us/help/5007409

Plugin Details

Severity: High

ID: 154999

File Name: smb_nt_ms21_nov_exchange.nasl

Version: 1.13

Type: local

Agent: windows

Published: 11/9/2021

Updated: 6/6/2024

Supported Sensors: Frictionless Assessment Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

CVSS Score Source: CVE-2021-42321

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.4

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

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:exchange_server:2016, cpe:/a:microsoft:exchange_server:2019

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/9/2021

Vulnerability Publication Date: 11/9/2021

CISA Known Exploited Vulnerability Due Dates: 12/1/2021

Exploitable With

Core Impact

Metasploit (Microsoft Exchange Server ChainedSerializationBinder RCE)

Reference Information

CVE: CVE-2021-41349, CVE-2021-42305, CVE-2021-42321

IAVA: 2021-A-0543-S

MSFT: MS21-5007409

MSKB: 5007409