FreeBSD: VID-D0BE41FE-2A20-4633-B057-4E8B25C41780: bro -- array bounds and potential DOS issues

Corelight reports:

Bro 2.5.5 primarily addresses security issues:

Fix array bounds checking in BinPAC: for arrays

that are fields within a record, the bounds check

was based on a pointer to the start of the record

rather than the start of the array field, potentially

resulting in a buffer over-read.

Fix SMTP command string comparisons: the number

of bytes compared was based on the user-supplied

string length and can lead to incorrect matches.

e.g. giving a command of "X" incorrectly matched

"X-ANONYMOUSTLS" (and an empty commands match

anything).

Address potential vectors for Denial of Service:

"Weird" events are now generally suppressed/sampled

by default according to some tunable parameters.

Improved handling of empty lines in several text

protocol analyzers that can cause performance issues

when seen in long sequences.

Add `smtp_excessive_pending_cmds' weird which

serves as a notification for when the "pending

command" queue has reached an upper limit and been

cleared to prevent one from attempting to slowly

exhaust memory.