Remote code execution in Microsoft Exchange server

1) Deserialization of Untrusted Data

EUVDB-ID: #VU82692

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: N/A

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: No

Description

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

The vulnerability exists due to insecure input validation when processing serialized data within the ChainedSerializationBinder class. A remote user can send specially crafted HTTP request to the application and execute arbitrary code on the target system.

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

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Microsoft Exchange Server: 2016 Cumulative Update 1 15.01.0396.030 - 2019 RTM 15.02.0221.012

CPE2.3

• cpe:2.3:a:microsoft:microsoft_exchange_server:2016_CU23_Oct23SU:15.01.2507.034:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_exchange_server:2019_RTM:15.02.0221.012:*:*:*:*:*:*

External links

https://www.zerodayinitiative.com/advisories/ZDI-23-1578/

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.