Buffer overflow in bos.rte.libc in IBM AIX 5.2 and 5.3 allows local users to execute arbitrary code via the "r-commands", possibly including (1) rdist, (2) rsh, (3) rcp, (4) rsync, and (5) rlogin.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32184
http://www.vupen.com/english/advisories/2007/0471
http://www.securityfocus.com/bid/22456
http://www.securityfocus.com/bid/22370
http://www-1.ibm.com/support/docview.wss?uid=isg1IY94368
http://www-1.ibm.com/support/docview.wss?uid=isg1IY94301
http://securitytracker.com/id?1017607