ftpd in IBM AIX 7.1.1 before SP10 and 7.1.2 before SP5, when a Workload Partition (aka WPAR) for AIX 5.2 or 5.3 is used, allows remote authenticated users to bypass intended permission settings and modify arbitrary files via FTP commands.
https://exchange.xforce.ibmcloud.com/vulnerabilities/91396
http://www.ibm.com/support/docview.wss?uid=isg1IV51421
http://www.ibm.com/support/docview.wss?uid=isg1IV51420
http://aix.software.ibm.com/aix/efixes/security/wparcre_advisory.asc