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The Hacker News - Cybersecurity News and Analysis: Windows 11

How to Mitigate Microsoft Windows 10, 11 SeriousSAM Vulnerability

How to Mitigate Microsoft Windows 10, 11 SeriousSAM Vulnerability

July 26, 2021The Hacker News
Microsoft Windows 10 and Windows 11 users are at risk of a new unpatched vulnerability that was recently disclosed publicly. As we reported last week, the vulnerability — SeriousSAM — allows attackers with low-level permissions to access Windows system files to perform a Pass-the-Hash (and potentially Silver Ticket) attack.  Attackers can exploit this vulnerability to obtain hashed passwords stored in the Security Account Manager (SAM) and Registry, and ultimately run arbitrary code with SYSTEM privileges. SeriousSAM vulnerability, tracked as CVE-2021-36934 , exists in the default configuration of Windows 10 and Windows 11, specifically due to a setting that allows 'read' permissions to the built-in user's group that contains all local users. As a result, built-in local users have access to read the SAM files and the Registry, where they can also view the hashes. Once the attacker has 'User' access, they can use a tool such as Mimikatz to gain access to the Re
New Windows and Linux Flaws Give Attackers Highest System Privileges

New Windows and Linux Flaws Give Attackers Highest System Privileges

July 20, 2021Ravie Lakshmanan
Microsoft's Windows 10 and the upcoming Windows 11 versions have been found vulnerable to a new local privilege escalation vulnerability that permits users with low-level permissions access Windows system files, in turn, enabling them to unmask the operating system installation password and even decrypt private keys. The vulnerability has been nicknamed "SeriousSAM." "Starting with Windows 10 build 1809, non-administrative users are granted access to SAM, SYSTEM, and SECURITY registry hive files," CERT Coordination Center (CERT/CC) said in a  vulnerability note  published Monday. "This can allow for local privilege escalation (LPE)." The operating system configuration files in question are as follows - c:\Windows\System32\config\sam c:\Windows\System32\config\system c:\Windows\System32\config\security Microsoft, which is tracking the vulnerability under the identifier  CVE-2021-36934 , acknowledged the issue, but has yet to roll out a patch, o
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