CVE-2021-34432 is a vulnerability that affects the Windows Print Spooler service. The flaw is caused by improper handling of privileged file operations, which can allow an attacker to gain elevated permissions on a targeted system. This vulnerability was publicly disclosed in July 2021 and has since been rated as critical.
The exploit for CVE-2021-34432 is known as "PrintNightmare", and it has been actively exploited in the wild. Attackers can use this vulnerability to execute arbitrary code with SYSTEM privileges, allowing them to take complete control of a compromised system. Microsoft released an emergency patch for this vulnerability shortly after the public disclosure, though there have been reports of the patch failing to fully address the issue.
The impact of CVE-2021-34432 is significant, as it can allow attackers to gain full control over a targeted system without any user interaction. Organizations are advised to apply the patch immediately and monitor their systems for any signs of compromise. Additionally, organizations should implement best practices such as least privilege access to limit the damage in the event of a successful attack.