Multiple vulnerabilities in Microsoft Exchange Server

1) Code Injection

EUVDB-ID: #VU52138

Risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-28480

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: before 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2016 Cumulative Update 19 Apr21SU 15.01.2176.012, 2016 Cumulative Update 20 Apr21SU 15.01.2242.008, 2019 Cumulative Update 8 Apr21SU 15.02.0792.013, 2019 Cumulative Update 9 Apr21SU 15.02.0858.010, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015

CPE2.3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28480

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Code Injection

EUVDB-ID: #VU52141

Risk: Low

CVSSv3.1: 7.2 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-28483

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote authenticated attacker on the local network can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: before 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2016 Cumulative Update 19 Apr21SU 15.01.2176.012, 2016 Cumulative Update 20 Apr21SU 15.01.2242.008, 2019 Cumulative Update 8 Apr21SU 15.02.0792.013, 2019 Cumulative Update 9 Apr21SU 15.02.0858.010, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015

CPE2.3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28483

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

3) Code Injection

EUVDB-ID: #VU52140

Risk: Medium

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-28482

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote authenticated attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: before 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2016 Cumulative Update 19 Apr21SU 15.01.2176.012, 2016 Cumulative Update 20 Apr21SU 15.01.2242.008, 2019 Cumulative Update 8 Apr21SU 15.02.0792.013, 2019 Cumulative Update 9 Apr21SU 15.02.0858.010, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015

CPE2.3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28482

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

4) Code Injection

EUVDB-ID: #VU52139

Risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-28481

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the Microsoft Exchange Server. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: before 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2016 Cumulative Update 19 Apr21SU 15.01.2176.012, 2016 Cumulative Update 20 Apr21SU 15.01.2242.008, 2019 Cumulative Update 8 Apr21SU 15.02.0792.013, 2019 Cumulative Update 9 Apr21SU 15.02.0858.010, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015, 2013 Cumulative Update 23 Apr21SU 15.00.1497.015

CPE2.3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28481

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

Risk	High
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2021-28480 CVE-2021-28483 CVE-2021-28482 CVE-2021-28481
CWE-ID	CWE-94
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. Public exploit code for vulnerability #4 is available.
Vulnerable software	Microsoft Exchange Server Server applications / Mail servers
Vendor	Microsoft