#VU81805 Input validation error in Skype for Business Server - CVE-2023-36789

Vulnerability identifier: #VU81805

Vulnerability risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-36789

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Skype for Business Server
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Microsoft

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in Skype for Business in the "NT AUTHORITYNetwork Service". A remote administrator can pass specially crafted input to the application and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Skype for Business Server: before 6.0.9319.869

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36789

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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