FreeBSD: VID-8eefa87f-31f1-496d-bf8e-2b465b6e4e8a: zeek -- potential DoS vulnerabilities

Tim Wojtulewicz of Corelight reports: File extraction limits were not correctly enforced for files containing large amounts of missing bytes. Sessions are sometimes not cleaned up completely within Zeek during shutdown, potentially causing a crash when using the -B dpd flag for debug logging. A specially-crafted HTTP packet can cause Zeek's filename extraction code to take a long time to process the data. A specially-crafted series of FTP packets made up of a CWD request followed by a large amount of ERPT requests may cause Zeek to spend a long time logging the commands. A specially-crafted VLAN packet can cause Zeek to overflow memory and potentially crash.