#VU74976 Server-Side Request Forgery (SSRF) in Microsoft products - CVE-2023-28288

Vulnerability identifier: #VU74976

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-28288

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Microsoft SharePoint Foundation
Server applications / Application servers
Microsoft SharePoint Server Subscription Edition
Server applications / Application servers
Microsoft SharePoint Server
Server applications / Application servers
Microsoft SharePoint Enterprise Server
Server applications / Application servers

Vendor: Microsoft

Description

The disclosed vulnerability allows a remote user to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input within the WSSXmlUrlResolver class. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft SharePoint Foundation: 2013 Service Pack 1

Microsoft SharePoint Server Subscription Edition: All versions

Microsoft SharePoint Server: 2019

Microsoft SharePoint Enterprise Server: 2013 Service Pack 1 - 2016

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-28288
https://www.zerodayinitiative.com/advisories/ZDI-23-382/

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Q & A

Can this vulnerability be exploited remotely?

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

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.