HTB: CheckerChecker is a challenging machine that demonstrates CVE-2023-1545 on Teampass, CVE-2023-6199 on BookStack, the use of Google Authenticator as SSH TOTP, and a race condition on shared memory for privilege escalation.404Gh0stFebruary 28, 202514 min readLinuxHardTOTPBookstackTeampassRace Condition