Novell iChain 2.3 includes the build number in the VIA line of the proxy server's HTTP headers, which allows remote attackers to obtain sensitive information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17135
http://www.securityfocus.com/bid/11061
http://support.novell.com/cgi-bin/search/searchtid.cgi?2972080.htm