Overview

On October 11, NSFOCUS CERT monitored that Microsoft had released a security update patch for October, fixing 104 security problems, involving Microsoft WordPad, Skype for Business, Windows Layer 2 Tunneling Protocol, Microsoft Message Queuing and other widely used products, including high-risk vulnerability types such as privilege enhancement, remote code execution, etc.

Among the vulnerabilities fixed in Microsoft’s monthly updates this month, there are 12 critical vulnerabilities and 92 important vulnerabilities. This includes three vulnerabilities that exist in the wild:

• Skype for Business Privilege Escalation Vulnerability (CVS 2023-41763)
• Microsoft WordPad Information Disclosure Vulnerability (CVE-2023-36563)
• MITRE: CVE-2023-44487-HTTP/2 Quick Reset Attack

Please update the patch as soon as possible. Please refer to the appendix for a complete list of vulnerabilities.

Reference link:

https://msrc.microsoft.com/update-guide/releaseNote/2023-Oct

Key Vulnerabilities

Skype for Business privilege escalation vulnerability (CVS 2023-41763):

Skype for Business has a privilege escalation vulnerability, which allows remote attackers without authentication to make specialized network calls to the target Skype for Business server, potentially causing HTTP requests sent to arbitrary addresses to be parsed, revealing the IP address and port number to the attacker. Attackers who successfully exploit this vulnerability can view sensitive information, and in some cases, the exposed sensitive information can provide access to the internal network. The vulnerability has been publicly disclosed and has been exploited in the wild.

Official announcement link:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-41763

Microsoft WordPad Information Disclosure Vulnerability (CVS 2023-36563):

There is an information leakage vulnerability in Microsoft WordPad, which allows remote attackers who do not require authentication to exploit the vulnerability by running a crafted application or inducing local users to open malicious files after logging into the system. Successful exploitation of this vulnerability can result in NTLM hash leakage. The vulnerability has been publicly disclosed and has been exploited in the wild, with a CVSS score of 6.5.

Official announcement link:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-36563

MITRE: CVE-2023-44487-HTTP/2 Quick Reset Attack

Microsoft has released mitigation measures for DDoS attacks on HTTP/2, known as the “HTTP/2 Rapid Reset”. This attack abuses the HTTP/2 stream cancellation function to continuously send and cancel requests, causing the target server/application to run out of resources and cause a denial of service. This vulnerability has been widely exploited since August.

Official reference link:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-44487

Windows Layer 2 Tunneling Protocol Remote Code Execution Vulnerability (CVE-2023-41770/CVE-2023-41765/CVE-2023-41767/CVE-2023-38166/CVE-2023-41774/CVE-2023-41773/CVE-2023-41771/CVE-2023-41769/CVE-2023-41768):

Unauthenticated remote attackers can cause remote code execution on the RAS server computer by sending crafted protocol messages to the Routing and Remote Access Service (RRAS) server. Successful exploitation of this vulnerability requires the attacker to win competitive conditions. The CVSS score is 8.1.

Official link announcement:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41770

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41765

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41767

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-38166

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41774

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41773

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41771

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41769

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-41768

Microsoft Message Queuing Remote Code Execution Vulnerability (CVS 2023-35349):

There is a remote code execution vulnerability in Microsoft Message Queuing, which allows unauthenticated remote attackers to remotely execute code on the target server when the Message Queuing service is enabled. The CVSS score is 9.8.

Official announcement link:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-35349

Microsoft Message Queuing Remote Code Execution Vulnerability (CVS 2023-36697):

There is a remote code execution vulnerability in Microsoft Message Queuing, which allows authenticated domain users to remotely execute code on the target server. However, attackers need to induce the victim user to connect to a malicious server or disrupt the legitimate MSMQ server host and make it run as a malicious server. The CVSS score is 6.8.

Official announcement link:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-36697

Microsoft Virtual Trusted Platform Module (TPM) Remote Code Execution Vulnerability (CVS 2023-36718):

A local attacker with low privileges can successfully exploit this vulnerability to execute arbitrary code on the target system without user interaction. The CVSS score is 7.8.

Official announcement link:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-36718

Scope of Impact

The following are some affected product versions that focus on vulnerabilities. For other product ranges affected by vulnerabilities, please refer to the official announcement link.

Mitigation

At present, Microsoft has officially released security patches to fix the above vulnerabilities for supported product versions. It is strongly recommended that affected users install the patch as soon as possible for protection. The official download link is:

https://msrc.microsoft.com/update-guide/releaseNote/2023-Oct

Note: Due to network problems, computer environment problems and other reasons, the patch update of Windows Update may fail. After installing the patch, users should promptly check whether the patch has been successfully updated.

The mitigation measures for the quick reset attack on CVE-2023 44487-HTTP/2 can be found in: https://msrc.microsoft.com/blog/2023/10/microsoft-response-to-distributed-denial-of-service-ddos-attacks-against-http/2/

Appendix: Vulnerability List

Statement

This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.

About NSFOCUS

NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. The company’s Intelligent Hybrid Security strategy utilizes both cloud and on-premises security platforms, built on a foundation of real-time global threat intelligence, to provide multi-layered, unified and dynamic protection against advanced cyber attacks.

NSFOCUS works with Fortune Global 500 companies, including four of the world’s five largest financial institutions, organizations in insurance, retail, healthcare, critical infrastructure industries as well as government agencies. NSFOCUS has technology and channel partners in more than 60 countries, is a member of both the Microsoft Active Protections Program (MAPP), and the Cloud Security Alliance (CSA).

A wholly owned subsidiary of NSFOCUS Technologies Group Co., Ltd., the company has operations in the Americas, Europe, the Middle East and Asia Pacific.

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*** This is a Security Bloggers Network syndicated blog from NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. authored by NSFOCUS. Read the original post at: https://nsfocusglobal.com/microsofts-october-security-update-for-multiple-high-risk-product-vulnerabilities/