I passed a PCI security scan from our vendor a couple weeks ago but this morning I got an email that we are now failing. the Failure is listed as:
"It was possible to make the remote server crash using the 'nestea' attack. An attacker may use this flaw to shut down this server, thus preventing your network from working properly Solution: contact your operating system vendor for a patch. Risk Factor: High CVE : CVE-1999-0257 BID : 7219 Other references : OSVDB:5729"
From the reading I have been doing 'nestea' affects Linux boxes and I don't have any on my network. Also the port protocol is listed as UDP and I only have one server that allows UDP traffic through a static mapping and it is a Windows server. Could the scan be referring to the firewall itself? I have an ASA5510 running Software Version 8.0(3).
Has anyone seen tihs issue or have any ideas? We are listed as failing compliance until I can correct this but I don't know where the problem is.
I don't believe I've seen an advisory for Cisco ASA related to this type of attack.
Have you discussed this issue with your ASV who performed the scan?
At this point, I think you definitely need more details regarding which system/device on your network is supposedly affected, and what criteria the security scanner used to determine that your system is vulnerable.
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...