mt-daapd: integer overflow allowing remote DoS and possibly arbitrary code execution

Integer overflow in the ws_getpostvars function in Firefly Media Server (formerly mt-daapd) 0.2.4.1 (0.9~r1696-1.2 on Debian) allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an HTTP POST request with a large Content-Length.

Firefly Media Server 1.0.0.1359 allows remote attackers to cause a denial of service (NULL pointer dereference) via a (1) crafted Connection HTTP header; a return carriage control character in the (2) Accept Language header, (3) User-agent header, (4) Host header, or (5) protocol version; or a (6) crafted HTTP protocol version.