Penetration Testing mailing list archives
RE: pre-scanning for vulnerability scans?
From: "Lyal Collins" <lyal.collins () key2it com au>
Date: Tue, 10 Jan 2006 07:30:20 +1100
Not sure about cable modems, but many DSL modem/switch/firewall devices have more or less hard limits on the number of 'routes' (src IP, port, dest IP, port) due to limited memory, thus limited ip_conntrack pools. Exhaust the ip_conntrack pool and packet log/queuing/dropping becomes a dominating factor for speed and accuracy. Using a USB DSL modem and a PC-based linux box as the router and or test machine may increase this threshold substantially, otherwise I've found tweaking your DSL modem to increase the ip_conntrack pool to the devices memory limits, and reduce the timeout settings so as to release used ip_conntracks quicker will somewhat increase your scanning speed to around the '-T polite' setting on nmap. Unicornscan also needs to be throttled down on NATed DSL modems, in my experience, to a few dozen to 100pps or so. Patience in recon scanning pays off later, in my view. Lyal -----Original Message----- From: offset [mailto:offset () core svcroot net] Sent: Monday, 9 January 2006 4:48 PM To: pen-test () securityfocus com Subject: pre-scanning for vulnerability scans? Greetings, My goal is to determine ways to speed up network vulnerability scans on a number of /20 networks (but not at the expense of accuracy) Given the goal above, anyone have experience testing accuracy and speed for host detection and full port scans using various network scanners (ie, unicorn versus nmap)? Do you find that bandwidth is the limiting factor to negate differences between scanners? Assuming source is typical broadband (dsl, cable) around 1Mbps upload speed. Looking to find most efficient methods of the following, assume stealth is not the goal, but accuracy is 1. host up detection (detecting ports (ie, 80, 443)), mark for followup later (queue for full scan) 2. full port SYN scan on detected hosts (TCP only) 3. vulnerability analysis based on host/port information Regards ---------------------------------------------------------------------------- -- Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 ---------------------------------------------------------------------------- --- ------------------------------------------------------------------------------ Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 -------------------------------------------------------------------------------
Current thread:
- pre-scanning for vulnerability scans? offset (Jan 09)
- Re: pre-scanning for vulnerability scans? robert (Jan 09)
- RE: pre-scanning for vulnerability scans? Lyal Collins (Jan 09)
- Re: pre-scanning for vulnerability scans? Ivan Arce (Jan 14)