#microsoft

Microsoft PostScript and PCL6 Class Printer Driver Information Disclosure Vulnerability

Microsoft PostScript and PCL6 Class Printer Driver Remote Code Execution Vulnerability

Organizations must educate themselves and their users on how to detect, disrupt, and defend against the increasing volume of online disinformation.

May 9, 2023 update: Releases for Microsoft Products has been updated with the release of CVE-2023-29324 - Security Update Guide - Microsoft - Windows MSHTML Platform Security Feature Bypass Vulnerability March 24, 2023 update: Impact Assessment has been updated to a link to Guidance for investigating attacks using CVE-2023-23397 - Microsoft Security Blog.

Summary Summary Microsoft Threat Intelligence discovered limited, targeted abuse of a vulnerability in Microsoft Outlook for Windows that allows for new technology LAN manager (NTLM) credential theft. Microsoft has released CVE-2023-23397 to address the critical elevation of privilege (EoP) vulnerability affecting Microsoft Outlook for Windows. We strongly recommend all customers update Microsoft Outlook for Windows to remain secure.

An open source adversary-in-the-middle (AiTM) phishing kit has found a number of takers in the cybercrime world for its ability to orchestrate attacks at scale. Microsoft Threat Intelligence is tracking the threat actor behind the development of the kit under its emerging moniker DEV-1101. An AiTM phishing attack typically involves a threat actor attempting to steal and intercept a target's

**According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), integrity (I:H) and availability (A:H). What does that mean for this vulnerability?** An attacker who successfully exploited this vulnerability could access a user's Net-NTLMv2 hash which could be used as a basis of an NTLM Relay attack against another service to authenticate as the user.

**What is the relationship between Mark of the Web and Windows SmartScreen?** When you download a file from the internet, Windows adds the zone identifier or Mark of the Web as an NTFS stream to the file. So, when you run the file, Windows SmartScreen checks if there is a zone identifier Alternate Data Stream (ADS) attached to the file. If the ADS indicates ZoneId=3 which means that the file was downloaded from the internet, the SmartScreen does a reputation check. For more information on SmartScreen, please visit Microsoft Defender SmartScreen overview | Microsoft Learn.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** An attacker would have to send the victim a malicious URL that the victim would have to execute.

本ブログは、Microsoft Mitigates Outlook Elevation of Privilege Vulnerability の抄訳版です。最新の情報は原文を参照してください。 Microsoft Threat Intelligence は