Black Arrow Cyber Advisory 12 October 2023 – Microsoft Patch Tuesday, Adobe and Chrome Updates Summary.

12 Oct

Executive summary

Microsoft’s October 2023 Patch Tuesday provides updates to address 103 security issues across its product range, including two actively exploited zero-day vulnerabilities (CVE-2023-36563 and CVE-2023-41763). One of the exploited zero-day vulnerabilities is a privilege escalation vulnerability in skype. The other is an information disclosure vulnerability in Microsoft WordPad that can result in disclosure of NTLM hashes. Also among the updates provided by Microsoft were 13 critical vulnerabilities.

In addition to the Microsoft updates this week also saw Adobe fix 13 vulnerabilities across various products, with a vulnerability in Adobe Reader under active exploitation, and Google addressing 20 vulnerabilities in Chrome.

What’s the risk to me or my business?

The actively exploited vulnerabilities could allow an attacker with access, to elevate privileges or capture the hashes of user passwords to gain access to that users accounts. Both compromise the confidentiality, integrity and availability of data stored by an organisation.

What can I do?

Security updates are available for all supported versions of Windows impacted. The updates should be applied as soon as possible for the actively exploited vulnerability and all other vulnerabilities that have a critical severity rating.

Technical Summary

CVE-2023-36563: If exploited the vulnerability disclosures of information in Microsoft WordPad that could result in leak in NTLM hashes.

CVE-2023-41763: If actively exploited it allows for an attacker to escalate privileges in Skype that could lead to the exposure of sensitive information, such as IP addresses, port numbers and enabling an attacker to gain access to internal networks.

Adobe

This month, Adobe released fixes for 13 vulnerabilities, of which 8 were rated critical across Adobe Bridge (2), Commerce (10) and Photoshop (1). Adobe have stated a vulnerability in Adobe Reader is under active exploitation. The vulnerabilities include remote code execution, memory leak, privilege escalation and security bypass.

Chrome

An update for Google Chrome which patches 20 vulnerabilities, with the most severe allowing for arbitrary code execution to be performed by a malicious attacker. Depending on the privileges associated with the user an attacker could then install programs; view, delete or modify the data; or create new accounts with full user rights. Users whose accounts have fewer user rights could be less impacted than those who operate with administrative user rights. While there are currently no reports of these vulnerabilities being exploited in the wild, it is advised to update to the latest version as soon as possible.

further details on other specific updates within this patch Tuesday can be found here:

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

Further details about CVE-2023-36563 can be found here:

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

Further details about CVE-2023-41763 can be found here:

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

Further details of the vulnerabilities addressed in Adobe Bridge can be found here:

https://helpx.adobe.com/security/products/bridge/apsb23-49.html

Further details of the vulnerabilities addressed in Adobe Commerce can be found here:

https://helpx.adobe.com/security/products/magento/apsb23-50.html

Further details of the vulnerabilities addressed in Adobe Photoshop can be found here:

https://helpx.adobe.com/security/products/photoshop/apsb23-51.html