CVE-2023-28252: 
vulnerability analysis and mitigation

The Windows Common Log File System (CLFS) Driver Elevation of Privilege Vulnerability (CVE-2023-28252) was discovered and disclosed in April 2023. This vulnerability affects the Windows Common Log File System Driver, a logging service used by kernel-mode and user-mode applications. The vulnerability was actively exploited in the wild as a zero-day before being patched (Tenable Blog).

CVE-2023-28252 is classified as an elevation of privilege vulnerability with a CVSSv3 score of 7.8 (HIGH). The vulnerability is characterized by an out-of-bounds write (CWE-787) and heap-based buffer overflow (CWE-122) in the CLFS driver. This is a post-compromise vulnerability that requires an attacker to have prior access to the target system (NVD, Tenable Blog).

Successful exploitation of this vulnerability allows an attacker to elevate their privileges to SYSTEM level, providing them with the highest level of access on a Windows system. This is particularly significant as it represents the second CLFS Driver EoP vulnerability exploited in the wild in 2023, and the fourth known CLFS EoP vulnerability exploited in the wild in a two-year period (Tenable Blog).

Microsoft has released security updates to address this vulnerability as part of their April 2023 Patch Tuesday release. Organizations are strongly advised to apply the available patches to affected systems. The vulnerability was added to CISA's Known Exploited Vulnerabilities Catalog with a remediation due date of May 2, 2023 (NVD).