Samuel is the network administrator of DataX Communications, Inc. He is trying to configure his
firewall to block password brute force attempts on his network. He enables blocking the intruder’s
IP address for a period of 24 hours’ time after more than three unsuccessful attempts. He is
confident that this rule will secure his network from hackers on the Internet.
But he still receives hundreds of thousands brute-force attempts generated from various IP
addresses around the world. After some investigation he realizes that the intruders are using a
proxy somewhere else on the Internet which has been scripted to enable the random usage of
various proxies on each request so as not to get caught by the firewall rule.
Later he adds another rule to his firewall and enables small sleep on the password attempt so that
if the password is incorrect, it would take 45 seconds to return to the user to begin another
attempt. Since an intruder may use multiple machines to brute force the password, he also
throttles the number of connections that will be prepared to accept from a particular IP address.
This action will slow the intruder’s attempts.
Samuel wants to completely block hackers brute force attempts on his network.
What are the alternatives to defending against possible brute-force password attacks on his site?

Consider the following code:

URL:http://www.certified.com/search.pl?
text=<script>alert(document.cookie)</script>
If an attacker can trick a victim user to click a link like this, and the Web application does not
validate input, then the victim’s browser will pop up an alert showing the users current set of
cookies. An attacker can do much more damage, including stealing passwords, resetting your
home page, or redirecting the user to another Web site.
What is the countermeasure against XSS scripting?

What type of Trojan is this?

Maintaining a secure Web server requires constant effort, resources, and vigilance from an
organization. Securely administering a Web server on a daily basis is an essential aspect of Web
server security.
Maintaining the security of a Web server will usually involve the following steps:
1. Configuring, protecting, and analyzing log files
2. Backing up critical information frequently
3. Maintaining a protected authoritative copy of the organization’s Web content
4. Establishing and following procedures for recovering from compromise
5. Testing and applying patches in a timely manner
6. Testing security periodically.
In which step would you engage a forensic investigator?

In Buffer Overflow exploit, which of the following registers gets overwritten with return address of
the exploit code?

Web servers often contain directories that do not need to be indexed. You create a text file with
search engine indexing restrictions and place it on the root directory of the Web Server.
User-agent: *
Disallow: /images/
Disallow: /banners/
Disallow: /Forms/
Disallow: /Dictionary/
Disallow: /_borders/
Disallow: /_fpclass/
Disallow: /_overlay/
Disallow: /_private/
Disallow: /_themes/
What is the name of this file?

An attacker has successfully compromised a remote computer. Which of the following comes as
one of the last steps that should be taken to ensure that the compromise cannot be traced back to

the source of the problem?

Attackers target HINFO record types stored on a DNS server to enumerate information. These are
information records and potential source for reconnaissance. A network administrator has the
option of entering host information specifically the CPU type and operating system when creating
a new DNS record. An attacker can extract this type of information easily from a DNS server.
Which of the following commands extracts the HINFO record?

Bret is a web application administrator and has just read that there are a number of surprisingly
common web application vulnerabilities that can be exploited by unsophisticated attackers with
easily available tools on the Internet. He has also read that when an organization deploys a web
application, they invite the world to send HTTP requests. Attacks buried in these requests sail past
firewalls, filters, platform hardening, SSL, and IDS without notice because they are inside legal
HTTP requests. Bret is determined to weed out vulnerabilities.
What are some of the common vulnerabilities in web applications that he should be concerned
about?

What is War Dialing?