clamav -- arbitrary code execution and DoS vulnerabilities

Gentoo Linux Security Advisory reports:

Clam AntiVirus is vulnerable to a buffer overflow in
“libclamav/upx.c” when processing malformed UPX-packed
executables. It can also be sent into an infinite loop in
“libclamav/fsg.c” when processing specially-crafted
FSG-packed executables.
By sending a specially-crafted file an attacker could
execute arbitrary code with the permissions of the user
running Clam AntiVirus, or cause a Denial of Service.