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This chapter focuses on heap overflows on the Linux platform, which uses a malloc implementation originally written by Doug Lee, hence called dlmalloc. This chapter also introduces concepts that will help you when facing any other malloc() implementation. Indeed, writing a heap overflow is a rite of passage that teaches you how to think beyond grabbing EIP from a saved stack pointer. dlmalloc is just one library out of many that stores important meta-data interspersed with user data. Understanding how to exploit malloc bugs is a key to finding innovative ways to exploit bugs that don t fit into any particular category. Doug Lee himself has a terrific summary of dlmalloc on his Web site, at http://gee.cs.oswego.edu/dl/html/malloc.html. If you are unfamiliar with the Doug Lee malloc implementation, you should read it before going on with this chapter. Although his text goes over the concepts you ll need to be familiar with during exploitation, various changes have been made in modern glibc to his original implementation to make it multithreaded and optimized for various situations.

Figure 8-18

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Basically, the address 0xff3e21b4 contains the address of a table whose first entry will be the next function to which the dynamic linker will jump. At this point, we are going to check the layout of the dynamic linker within a process. We will discover that this address has an entry within the dynamic linker s symbol table, which will be very handy in locating it at a later stage.

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This script simply checks that the form is valid and that files are being received. The script picks up the submitted data from the $HTTP_POST_VARS and $HTTP_POST_FILES global variables; the field names in the form are used as indices. The files array is a vector of elements (indexed 0, 1, ...) each of which is an array of data concerning a single file. An individual file array is an associative array with indices name , size etc.; this allows access to the name of the file as on the submitting system (e.g. C:\Temp2\A2.cc), the name for the temporary file created on the server, the file size, and file type if this information was sent by the browser. (The PHP manual has more information on file upload capabilities; see 19 of the manual.) The second phase in development illustrates simple use of files and regular expression matching. The additional processing involved is a check on the student identifier submitted via the form. The regular expression check verifies that this has a particular required form. If it matches these requirements, a check is made against a list of valid student identifiers; these identifiers are read from a text file. For this example, a student identifier must:

(Some of these components are only available in the higher end enterprise editions of the Studio.) Different programming languages are supported through add-in modules, some of which come from third-party suppliers (e.g. ActiveState supplies the modules for Perl and Python). The studio supports the development of different types of application. It can create simple old-fashioned text-based console applications that run in a Command Prompt window. It incorporates a Winforms component that is used to develop Windows desktop client applications. Winforms applications can make greater usage of the GUI facilities in a Windows system, but obviously are more difficult to deploy on a large scale than are applications that use standard web browsers as clients. Winforms applications may be appropriate for use on local intranets, but most developments will utilize the Webforms and Webservices features of the studio. The Web forms and services components of the studio automatically generate a substantial amount of boiler plate code and XML deployment specifications that are needed for .NET applications. For example, code generated by Web forms can automate the preservation of state for form-based controls, while the setting of an extra tag on a server method is sufficient to allow the web services component to generate the XML documents needed to describe the service and also generate simple test pages that allow the service to be invoked.

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