Computer networks that are currently connected to the Internet are vulnerable to a variety of exploits that can compromise their intended operations. Systems can be subject to Denial of Service Attacks that prevents other computers from connecting to them for their provided service (e.g. web server) or prevent them from connecting to other computers on the Internet. They can be subject to attacks that cause them to cease operations either temporary or permanently. A hacker may be able to compromise a system and gain root access, i.e. the ability to control that system as if the hacker was the system administrator. The number of exploits targeted against various platforms, operating systems, and applications increases on a daily basis. System administrators are usually responsible for monitoring the overall security of their networks.

The tremendous increase in online transactions has been accompanied by an equal rise in the number and type of attacks against the security of online payment systems. Some of these attacks have utilized vulnerabilities that have been published in reusable third party components utilized by websites, such as shopping cart software. Other attacks have used vulnerabilities that are common in any web application, such as SQL injection or cross-site scripting. This article discusses these vulnerabilities with examples, either from the set of known vulnerabilities, or those discovered during the author’s penetration testing assignments. The different types of
vulnerabilities discussed here are SQL injection, cross-site scripting, information disclosure, path disclosure, price manipulation, and buffer overflows. Successful exploitation of these vulnerabilities can lead to a wide range of results. Information and path disclosure vulnerabilities will typically act as initial stages leading to further exploitation. SQL injection or price manipulation attacks could cripple the website, compromise confidentiality, and in worst cases cause the e-commerce business to shut down completely.


There are two types of intrusions:

  • Non- Technical Intrusion
  1. Social Engineering Attack
  2. Pretexting
  3. Phishing
  4. Smishing
  5. Vishing
  6. Tabnabbing
  •  Technical Intrusion
  1. DOS
  2. Input Validation
  3. Keyloggers
  4. Sniffing
  5. Other Type of high level
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