Usually I'll get the ASA logs (%ASA-5-304001) that I can grep for and see all of the 'Accessed URL' lines. For some reason none of these attacks are being logged. I'm concerned that not only are they getting through, they are doing so silently.
I am well aware of the logging types, the problem is that I'm not receiving the logging message 304001 for the given URI. I receive them for all other URI, just not this specific attack.
My thought is that the ASA signature swallows it, does not send it to syslog, and then passes it on to the web server. I'm okay with it passing it along but it seems a little odd that it does not get logged.
I was getting many of these requests and see them on all of my webservers but not one shows up in my syslog while all the other 304001 do show up.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...