CVE-2021-1648: 
vulnerability analysis and mitigation

The CVE-2021-1648 is a Microsoft splwow64 Elevation of Privilege Vulnerability that was discovered in Microsoft Windows systems. The vulnerability was reported on January 5, 2021, and Microsoft released security updates to address it on January 12, 2021. This vulnerability affects various versions of Microsoft Windows, including Windows 10 and Windows Server installations (ZDI Advisory).

The vulnerability exists within the user-mode printer driver host process splwow64.exe. The specific flaw stems from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. The vulnerability has been assigned a CVSS score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating a high severity level (ZDI Advisory).

If successfully exploited, this vulnerability allows attackers to escalate privileges from low integrity and execute arbitrary code in the context of the current user at medium integrity. The attacker must first obtain the ability to execute low-privileged code on the target system to exploit this vulnerability (ZDI Advisory).

The vulnerability requires local access to the system and the ability to execute low-privileged code for successful exploitation. An attacker must first gain access to run code on the target system before they can leverage this vulnerability for privilege escalation (ZDI Advisory).

Microsoft has released security updates to address this vulnerability. Multiple patches are available for different versions of Windows, including KB4598229, KB4598230, KB4598231, KB4598242, KB4598243, KB4598245, KB4598275, and KB4598297. Users are advised to apply these security updates to protect their systems (Rapid7).