An error code 100 is a system error which is displayed as ‘ERROR_TOO_MANY_SEMAPHORES’ or as a value 0x64. This error means that the system ‘cannot create another system semaphore. ‘ A semaphore is used in controlling access to parallel programming or a multi-user platform through multiple processes.
000 is a common code to use when no HTTP code was received due to a network error. According to a knowledge base article for Amazon CloudFront, 000 also means that the client disconnected before completing the request for that service.
The manual request component of the integrated test suites provides the basic facility to issue a single request and view its response. Though simple, this function is often extremely beneficial when you are probing a tentative vulnerability and need to reissue the same request manually several times, tweaking elements of the request to determine the … Read more
After the essential web browser, the most useful item in your toolkit when attacking a web application is an intercepting proxy. In the early days of web applications, the intercepting proxy was a standalone tool that provided the barest of possible functionality — notably the venerable Achilles proxy, which simply displayed each request and response … Read more
Some attacks on web applications can be performed using only a standard web browser; however, the majority of them require you to use some additional tools. Many of these tools operate in conjunction with the browser, either as extensions that modify the browser’s own functionality, or as external tools that run alongside the browser and … Read more
The core logic of most web applications is written in interpreted scripting languages like PHP, VBScript, and Perl. In addition to the possibilities for injecting into languages used by other back-end components, a key area of vulnerability concerns injection into the core application code itself. Exposure to this type of attack arises from two main … Read more
Almost every web application employs a database to store the various kinds of information that it needs in order to operate. For example, a web application deployed by an online retailer might use a database to store the following information: ■ User accounts, credentials, and personal information ■ Descriptions and prices of goods for sale … Read more
No matter how effective an application is at ensuring that the session tokens it generates do not contain any meaningful information and are not susceptible to analysis or prediction, its session mechanism will be wide open to attack if those tokens are not handled carefully after generation. For example, if tokens are disclosed to an … Read more
Session management mechanisms are often vulnerable to attack because tokens are generated in an unsafe manner that enables an attacker to identify the values of tokens that have been issued to other users. Meaningful Tokens Some session tokens are created using a transformation of the user’s user-name or email address, or other information associated with … Read more
If an application uses an unencrypted HTTP connection to transmit login credentials, an eavesdropper who is suitably positioned on the network will of course be able to intercept them. Depending on the user’s location, potential eavesdroppers may reside: ■ On the user’s local network ■ Within the user’s IT department ■ Within the user’s ISP … Read more