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Figure 11-5 WebScarab, after intercepting several requests
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WebScarab s tools for analyzing and visualizing session identifiers provide an easy way to identify weak session management implementations Figure 11-6 shows the SessionID Analysis tool s configuration In Figure 11-7, you can clearly see the pattern of incrementally increasing session IDs in a weak sample application
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Hacking Exposed 6: Network Security Secrets & Solutions
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Figure 11-6 Con guring the SessionID Analysis tool in WebScarab
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More than just a proxy, the Burp Suite is a complete suite of tools for attacking web applications, available at http://portswiggernet/suite/ Burp Proxy provides the usual functionality for intercepting and modifying web traffic, including conditional intercept and pattern-based automatic string replacement, which is shown in Figure 11-8 Requests
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Figure 11-7 WebScarab s session ID visualization makes it easy to spot awed algorithms
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can be modified and replayed using the Burp Repeater tool, and Burp Sequencer can be used to assess the strength of the application s session management Burp Spider, shown in Figure 11-9, gathers information about the target website, parsing HTML and analyzing JavaScript to provide attackers with a complete picture of the application Once you ve used the Burp Proxy and Spider tools to get an understanding of the target, you can use Burp Intruder to start attacking it Not for the faint of heart, Burp Intruder is a powerful tool for crafting automated attacks against web applications The attacker defines an attack request template, selects a set of payloads to incorporate into the attack templates, and then lets loose a volley of requests Burp Intruder processes the responses and presents the results of the attacks The free version of Burp Suite includes a limited version of Burp Intruder; to get the full functionality, you must purchase Burp Suite Professional
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Figure 11-8 The Burp Proxy con guration screen
Web Application Security Scanners
The tools described previously are designed to provide specific components of an overall web application assessment but what about all-in-one tools Application scanners automate the crawling and analysis of web applications, using generalized algorithms to identify broad classes of vulnerabilities and weed out false positives Targeted at
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Figure 11-9 Burp Spider s results window, showing the site tree and the information for a speci c page
enterprise users, these tools provide an all-in-one solution for web application assessment, although the rich feature set and functionality come at a high cost The commercial web application security scanner market continues to mature, and we discuss the current leading entries in the remainder of this section Before we begin, it is important to highlight the manual nature of web application security testing Many web apps are complex and highly customized, so using cookiecutter tools such as these to attempt to deconstruct and analyze them is often futile However, these tools can provide a great compliance checkpoint that indicates whether an application is reasonably free of known defects such as SQL injection, cross-site scripting, and the like There is still solid value in knowing that one s web apps are comprehensively checked for such compliance on a regular basis
Hacking Exposed 6: Network Security Secrets & Solutions
Hewlett-Packard WebInspect and Security Toolkit Acquired by Hewlett-Packard (HP) in 2007, SPI Dynamics security tools (http://wwwhpcom/go/securitysoftware) go beyond their web security scanning tool, WebInspect, to include a suite of products that can improve security across the web application development lifecycle, including DevInspect, which allows coders to check for vulnerabilities while building web applications; QAInspect, a security-focused quality assurance (QA) module based on Mercury TestDirector; and a toolkit for advanced web application penetration testing Seems like a savvy product lineup to us our experiences with development teams is that these areas of the development cycle are where they need the most help (dev, test, and audit) HP also advertises an Assessment Management Platform (AMP) that distributes the management of several WebInspect scanners and promises to provide a real-time, highlevel, dashboard view of an enterprise s current risk posture and policy compliance HP is also savvy enough to provide free downloads of limited versions of their tools to try out, which we did with both WebInspect 77 and HP Security Toolkit WebInspect s main features don t seem to have changed much since we first looked at the tool a couple years back, but clearly work has been going on under the hood judging by the 2,989 vulnerability checks present in the database of our trial download Yes, we know that the sheer number of checks doesn t always equate to the overall accuracy/ quality of the tool, but it is a rough yardstick by which to measure against other offerings that should be checking for the same weaknesses To see how a typical scan might run, HP also kindly provides a test server (aptly named http://zero webappsecuritycom) that took us over 10 hours to scan with all checks (except brute force) enabled At the time of our testing the test server contained approximately 600 pages, many with a large amount of dynamic content, according to the scanner output Obviously, this wouldn t scale across thousands or even hundreds of servers (although we didn t consider HP s APM distributed scan management system), and we have no idea what performance load this caused on the test server, if anything significant These issues would clearly have to be considered by larger sites if they wanted to use WebInspect A screen shot of WebInspect following our scans is shown in Figure 11-10 As far as results, WebInspect found 243 issues: 76 Critical, 60 High, 8 Medium, 8 Low, and 15 Best Practice We briefly perused the Critical vulnerabilities, and although most seemed kind of run-of-the-mill (common sensitive files were found, ASP source revealed), one did indicate that several verified SQL injection vulnerabilities were identified We were also pleasantly surprised at the increased number of applicationlevel checks that WebInspect has added since we last looked at the tool, when it seemed to be focused more on server-level flaws Finally, WebInspect did a great job of inventorying the test site, and it provided many ways to slice and dice the data via its summary, browse (rendered HTML), source, and form views for every page discovered Although this quick analysis only gave us a minimal sense of the capabilities of WebInspect, we came away quietly impressed and would consider investigating the product further to see how well it performs against a real-world application How about cost Quickly checking Internet search engines revealed retail prices (as of April 2008) of around $25,000 for a single user license Although this clearly puts the product into the league of substantive IT shops or well-financed consultants, it appears competitive to us
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