CRLF injection vulnerability in Yet another Bulletin Board (YaBB) 2.1 allows remote attackers to obtain administrative access via requests to (1) register.pl or (2) profile.pl that write CRLF sequences to a .vars file. NOTE: this can be leveraged to execute arbitrary code.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34848
http://www.yabbforum.com/community/?board=general%3Baction=display%3Bnum=1181678785
http://www.securitytracker.com/id?1018236
http://www.securityfocus.com/bid/24455
http://secunia.com/advisories/25656
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=538