freshclam in (1) Clam Antivirus (ClamAV) 0.88 and (2) ClamXav 1.0.3h and earlier does not drop privileges before processing the config-file command line option, which allows local users to read portions of arbitrary files when an error message displays the first line of the target file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26453
http://www.vupen.com/english/advisories/2006/1807
http://www.securityfocus.com/archive/1/434008/100/0/threaded
http://www.digitalmunition.com/DMA%5B2006-0514a%5D.txt