WEB SERVER PDF
Before we even start to talk about Web servers, let's look at clients and . browsers to display PDF (Portable Document Format) files, and Macro. The Web server - Apache - Complete Guide is one of the many topics covered in the series of books that I'm writing on Linux, the goal of which is to help any. PDF | The embedded web server technology is the combination of embedded device and Internet technology, which provides a flexible remote.
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Web server is a computer where the web content is stored. Basically web server is used to host the web sites but there exists other web servers also such as. Thank you for downloading this excerpt from Run Your Own Web Server. Using Linux & Apache, written by Stuart Langridge and Tony Steidler-. This report first examines the history of server operating systems and their timelines. It then went on to discuss the most important features of webserver.
In nd. Hence it is vulnerable to network eavesdropping. When section 3 we have gone into depth and discussed how these confidential documents are transmitted from the Web server security features are implemented in Apache. Finally, we to the browser, or when the end-user sends private informa- match the security features of Apache with various security tion back to the server inside a fill-out form, someone may patterns.
In these wsed by default for security reasons. Ideally, no one but network-based attacks authorized users are denied the use the lead CGI developer and the system administrator should of network services. DoS attacks come in variety of forms have full access on the files contained by the directory ref- and aim at a variety of services such as the consumption erenced by ScriptAlias.
Ability of Web Server arbitrary directories. To allow CGI program execution for any file ending in. Reducing CGI risks with wrappers 2. File Permission A wrapper allows CGI applications to be run under the user There are two file systems roots working in a server, namely, ID of the site owner, i. Wrapping CGI ap- root having all the logs and configuration files. Most CGI wrappers perform additional security because this keeps all the sensitive information and also the checks before they allow a requested application to execute.
CGI scripts. Two popular CGI wrappers are: 3. Apache is the number one choice to ensure the request is valid.
It is the most ecuted. Failure in any of the checks causes the script widely used Web Server on the Internet because of its stan- not to run and an error is logged.
It does this by running any program defined as a CGI application as the file owner rather than the Apache 3. Securing against CGI user. CGIWrap also performs several security checks Three ways to secure against CGI are discussed below: on the CGI application; the application will not be executed if any of the checks fail.
The ScriptAlias approach 3. SSI are directives that are placed in HTML pages, and eval- This directory should always be separate from the Docu- uated on the server while the pages are being served. They mentRoot tree.
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It also ensures only Web administrators can let adding dynamically generated content to an existing HT access the files that reside there. SSI presents ias directive.
Memory and Resource Management: Apache Pool All SSI enabled files have to be parsed by the server whether there are not any SSI directives included wi- Apache provides an own memory and resource management thin the files.
A pool can manage memory, sockets files can execute any CGI script or program under the and processes, which are all valuable resources for a server permissions of the user and group Apache runs as, as system. This feature is exceedingly dangerous, as it will ex- ecute whatever code happens to be embedded in the 3. Intrusion Detection: Apache Log exec tag. In order to effectively manage a web server, it is neces- There are actually three ways to enhance security and sary to get feedback about the activity and performance of also getting the advantages of SSI: the server as well as any problems that may be occurring.
Log files show what actually a server administrator can enable suEXEC. This helps keep server ing of what attacks is thrown against the server and allows load at a minimum and allows for easier management checking if the necessary level of security is present. Penetration techniques can also be gleamed tives if they have the execute bit set.
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So, to add SSI from the logs. Some of them are: and programs from SSI pages. Users may still use: ging of client requests. Pharming— With this type of attack, the attacker compromises the Domain Name System DNS servers or on the user computer so that traffic is directed to a malicious site.
Compromised user data may be used for fraudulent activities which may lead to business loss or lawsuits from the users who entrusted their details with the organization Web server attack tools Some of the common web server attack tools include; Metasploit— this is an open source tool for developing, testing and using exploit code. It can be used to discover vulnerabilities in web servers and write exploits that can be used to compromise the server. MPack— this is a web exploitation tool. Once a web server has been compromised using MPack, all traffic to it is redirected to malicious download websites.
Zeus— this tool can be used to turn a compromised computer into a bot or zombie. A bot is a compromised computer which is used to perform internet-based attacks. A botnet is a collection of compromised computers. The botnet can then be used in a denial of service attack or sending spam mails.
Neosplit — this tool can be used to install programs, delete programs, replicating it, etc. How to avoid attacks on Web server An organization can adopt the following policy to protect itself against web server attacks. Patch management— this involves installing patches to help secure the server. A patch is an update that fixes a bug in the software. The patches can be applied to the operating system and the web server system.
Secure installation and configuration of the operating system Secure installation and configuration of the web server software Vulnerability scanning system— these include tools such as Snort, NMap, Scanner Access Now Easy SANE Firewalls can be used to stop simple DoS attacks by blocking all traffic coming the identify source IP addresses of the attacker.
We will assume we are targeting www. We are not actually going to hack into it as this is illegal. We will only use the domain for educational purposes.
What we will need.A webserver operating system is a program that is specifically developed to exploit the hardware resources of the webserver in order to provide services to clients on request.
Apache web server bug grants root access on shared hosting environments
These features are the issues of reliability of the system, the security and network security mechanisms the system should be able host, and finally the performance of storage hierarchy. This report first examines the history of server operating systems and their timelines.
This is the issue of system uptime, which is how a webserver operating system can withstand the pressure of being up and running all the time to deliver services to clients. It is when Windows and Linux started producing of these systems that the battlefield turned to commercialisation. SSI presents ias directive.
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