Naptha – TCP State Exhaustion Vulnerability & Tool

The New Acunetix V12 Engine


The Naptha vulnerabilities are a type of denial-of-service vulnerabilities researched and documented by Bob Keyes of BindView’s RAZOR Security Team in 2000. The vulnerabilities exist in some implementations of the TCP protocol, specifically in the way some TCP implementations keep track of the state of TCP connections, and allow an attacker to exhaust the resources of a system under attack without utilizing much resources on the system used to launch the attack.

The following links provide more information about the Naptha denial-of-service vulnerabilities:

  • The original BindView advisory is archived here.
  • The advisory that CERT/CC published for the Naptha vulnerabilities is here.

The Tool

To study and show the Naptha vulnerabilities, Bob Keyes wrote the Naptha tool. The tool was written in C and used libpcap to read packets from the network and libdnet to craft packets.

The Naptha tool actually consists of two programs: a program called synsend whose only function is to send TCP SYN packets to the target system, and a program called srvr whose function is to respond to specific traffic received from the target system with TCP packets with specific TCP flags set. Both what traffic to respond to and how to respond to it are specified by the user via command-line arguments.

You can download Naptha here:

naptha-1.1.tgz

Or read more here.

Posted in: Exploits/Vulnerabilities, Hacking Tools, Networking Hacking


Latest Posts:


Eraser - Windows Secure Erase Hard Drive Wiper Eraser – Windows Secure Erase Hard Drive Wiper
Eraser is a hard drive wiper for Windows which allows you to run a secure erase and completely remove sensitive data from your hard drive by overwriting it several times with carefully selected patterns.
Insecure software versions are a problem Web Security Stats Show XSS & Outdated Software Are Major Problems
Netsparker just published some anonymized Web Security Stats about the security vulnerabilities their online solution identified on their users’ web applications and web services during the last 3 years.
CTFR - Abuse Certificate Transparency Logs For HTTPS Subdomains CTFR – Abuse Certificate Transparency Logs For HTTPS Subdomains
CTFR is a Python-based tool to Abuse Certificate Transparency Logs to get subdomains from a HTTPS website in a few seconds.
testssl.sh - Test SSL Security Including Ciphers, Protocols & Detect Flaws testssl.sh – Test SSL Security Including Ciphers, Protocols & Detect Flaws
testssl.sh is a free command line tool to test SSL security, it checks a server's service on any port for the support of TLS/SSL ciphers, protocols as well as recent cryptographic flaws and more.
Four Year Old libSSH Bug Leaves Servers Wide Open Four Year Old libssh Bug Leaves Servers Wide Open
A fairly serious 4-year old libssh bug has left servers vulnerable to remote compromise, fortunately, the attack surface isn't that big as neither OpenSSH or the GitHub implementation are affected.
CHIPSEC - Platform Security Assessment Framework CHIPSEC – Platform Security Assessment Framework For Firmware Hacking
CHIPSEC is a platform security assessment framework for PCs including hardware, system firmware (BIOS/UEFI), and platform components for firmware hacking.


Comments are closed.