FreeBSD: VID-60d4d31a-a573-41bd-8c1e-5af7513c1ee9: zeek -- potential DoS vulnerabilities

Tim Wojtulewicz of Corelight reports: Fix an issue where a specially-crafted FTP packet can cause Zeek to spend large amounts of time attempting to search for valid commands in the data stream. Fix a possible overflow in the Zeek dictionary code that may lead to a memory leak. Fix an issue where a specially-crafted packet can cause Zeek to spend large amounts of time reporting analyzer violations. Fix a possible assert and crash in the HTTP analyzer when receiving a specially crafted packet. Fix an issue where a specially-crafted HTTP or SMTP packet can cause Zeek to spend a large amount of time attempting to search for filenames within the packet data. Fix two separate possible crashes when converting processed IP headers for logging via the raw_packet event handlers.