Unknown vulnerability in the rwho daemon (in.rwhod) for Solaris 7 through 9 allows remote attackers to execute arbitrary code.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A592
https://exchange.xforce.ibmcloud.com/vulnerabilities/18385
http://www.securityfocus.com/bid/11840
http://www.ciac.org/ciac/bulletins/p-050.shtml