Security Updates for Exchange (October 2021)

critical Nessus Plugin ID 154175

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 can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-26427)
- An elevation of privilege vulnerability. An attacker can exploit this to gain elevated privileges. (CVE-2021-41348)
- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-41350)

- A denial of service (DoS) vulnerability. An attacker can exploit this issue to cause the affected component to deny system or application services. (CVE-2021-34453)

Solution

Microsoft has released the following security updates to address this issue:
-KB5007011
-KB5007012

See Also

https://support.microsoft.com/en-us/help/5007011

https://support.microsoft.com/en-us/help/5007012

Plugin Details

Severity: Critical

ID: 154175

File Name: smb_nt_ms21_oct_exchange.nasl

Version: 1.6

Type: local

Agent: windows

Published: 10/15/2021

Updated: 1/26/2022

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

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

CVSS Score Source: CVE-2021-26427

CVSS v3

Risk Factor: Critical

Base Score: 9.6

Temporal Score: 8.3

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:exchange_server

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 10/12/2021

Vulnerability Publication Date: 10/12/2021

Reference Information

CVE: CVE-2021-26427, CVE-2021-34453, CVE-2021-41348, CVE-2021-41350

MSKB: 5007011, 5007012

MSFT: MS21-5007011, MS21-5007012

IAVA: 2021-A-0466-S