CAPI4HylaFAX 1.3, when compiled with GENERATE_DEBUGSFFDATAFILE set, allows local users to modify arbitrary files via a symlink attack on the c2faxrecv_dbgdatafile.sff temporary file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25262
http://www.securityfocus.com/bid/17034
http://www.securityfocus.com/archive/1/427084/100/0/threaded