The vulnerability stems from centreon-backup.pl's insecure handling of configuration values. The script uses $centreon_config->{CentreonDir} from the world-writable conf.pm file to construct paths for executing centreon-backup-mysql.sh. Since the configuration file is group-writable and apache is part of the centreon group, attackers can modify CentreonDir to point to a malicious script. The cron job executes centreon-backup.pl as root, leading to privilege escalation. While no specific named functions are mentioned in disclosures, the main script execution flow that parses the insecure configuration and executes external commands is clearly implicated.