FreeBSD: VID-96d6809a-81df-46d4-87ed-2f78c79f06b1: zeek -- potential DoS vulnerabilities

Tim Wojtulewicz of Corelight reports: Receiving DNS responses from async DNS requests (via A specially-crafted stream of FTP packets containing a command reply with many intermediate lines can cause Zeek to spend a large amount of time processing data. A specially-crafted set of packets containing extremely large file offsets cause cause the reassembler code to allocate large amounts of memory. The DNS manager does not correctly expire responses that don't contain any data, such those containing NXDOMAIN or NODATA status codes. This can lead to Zeek allocating large amounts of memory for these responses and never deallocating them. A specially-crafted stream of RDP packets can cause Zeek to spend large protocol validation. A specially-crafted stream of SMTP packets can cause Zeek to spend large amounts of time processing data.