ibacm 1.0.7 creates files with world-writable permissions, which allows local users to overwrite the ib_acm daemon log or ibacm.port file.
http://www.securityfocus.com/bid/55890
http://www.openwall.com/lists/oss-security/2012/10/11/9
http://www.openwall.com/lists/oss-security/2012/10/11/6