The squidclamav_check_preview_handler function in squidclamav.c in SquidClamav 5.x before 5.8 and 6.x before 6.7 passes an unescaped URL to a system command call, which allows remote attackers to cause a denial of service (daemon crash) via a URL with certain characters, as demonstrated using %0D or %0A.
freecode.com/projects/squidclamav/releases/346722
secunia.com/advisories/49057
squidclamav.darold.net/news.html
www.openwall.com/lists/oss-security/2012/08/16/2
www.openwall.com/lists/oss-security/2012/08/16/4
www.osvdb.org/84138
www.securityfocus.com/bid/54663
bugs.gentoo.org/show_bug.cgi?id=428778
github.com/darold/squidclamav/commit/80f74451f628264d1d9a1f1c0bbcebc932ba5e00