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: 1.10

Type: local

Agent: windows

Published: 11/9/2021

Updated: 2/25/2022

Risk Information

CVSS Score Source: CVE-2021-42321

VPR

Risk Factor: Critical

Score: 9.6

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

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: 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: 11/9/2021

Vulnerability Publication Date: 11/9/2021

CISA Known Exploited Dates: 12/1/2021

Exploitable With

Metasploit (Microsoft Exchange Server ChainedSerializationBinder Deny List Typo RCE)

Reference Information

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

IAVA: 2021-A-0543-S

MSKB: 5007409

MSFT: MS21-5007409