SB20230509101 - Multiple vulnerabilities in Microsoft SharePoint Server

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Code Injection (CVE-ID: CVE-2023-24955)

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

The vulnerability exists due to improper input validation within the GenerateProxyAssembly method. A remote privileged user 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.

2) Spoofing attack (CVE-ID: CVE-2023-24950)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to incorrect processing of user-supplied within the implementation of the AdRotator WebControl. A remote user can perform NTLM relay attack and obtain credentials of the service account.

3) Information disclosure (CVE-ID: CVE-2023-24954)

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output within the userphoto endpoint. A remote user can gain unauthorized access to sensitive information on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-24955
• https://www.zerodayinitiative.com/advisories/ZDI-23-883/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-24950
• https://www.zerodayinitiative.com/advisories/ZDI-23-571/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-24954
• https://www.zerodayinitiative.com/advisories/ZDI-23-884/