CVE-2021-3576: 
Bitdefender Endpoint Security Tools vulnerability analysis and mitigation

CVE-2021-3576 is a privilege escalation vulnerability affecting Bitdefender Endpoint Security Tools and Total Security products. The vulnerability was discovered by Michael DePlante of Trend Micro's Zero Day Initiative and was publicly disclosed on October 28th, 2021. The issue affects Bitdefender Endpoint Security Tools versions prior to 7.2.1.65 and Bitdefender Total Security versions prior to 25.0.26 (Bitdefender Advisory).

The vulnerability is classified as an 'Execution with Unnecessary Privileges' issue with a CVSS score of 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The specific flaw exists within the endpoint client where the issue results from allowing an untrusted process to impersonate the client of a pipe. The vulnerability involves impersonation that enables the server thread to perform actions on behalf of the client but within the limits of the client's security context (ZDI Advisory).

An attacker who successfully exploits this vulnerability can escalate privileges and execute arbitrary code in the context of SYSTEM (NT AUTHORITY\System). This represents a significant security risk as it allows attackers to gain the highest level of system privileges (ZDI Advisory).

Bitdefender has released automatic updates to address this vulnerability. Users should ensure they are running Bitdefender Endpoint Security Tools version 7.2.1.65 or later, or Bitdefender Total Security version 25.0.26 or later (Bitdefender Advisory).