Vulnerability identifier: #VU72174

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-21529

CWE-ID: CWE-749

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Exchange Server
Server applications / Mail servers

Vendor: Microsoft

Description

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

The vulnerability exists due to improper input validation within the MultiValuedProperty class. A remote user can send a specially crafted request and execute arbitrary code in the context of the server's account.

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: 2019 Preview 15.02.0196.000 - 2019 CU12 Jan23SU 15.02.1118.021, 2013 RTM 15.00.0516.032 - 2013 CU23 Jan23SU 15.00.1497.045, 2016 Preview 15.01.0225.016 - 2016 CU23 Jan23SU 15.01.2507.017

---

External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-21529
http://www.zerodayinitiative.com/advisories/ZDI-23-162/

---

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.