The last object we PUSH on the stack is the one that we get back at the next POP operation. Traditionally, the stack grows from higher addresses toward lower addresses, as you saw in Chapter 2. In such a case, the PUSH operation subtracts the object size from the TOS (top of the ...
In languages that use a value model of variables, recursive types require the notion of a pointer: a variable (or field) whose value is a reference to some object. Pointers were first introduced in PL/I. In some languages (e.g., Pascal, Ada 83, and Modula-3), pointers are restricted...
so the command used to overwrite this word is: site exec \x20\xbc\x02\x10%x%x%x%n Immediately after the attack sends the malicious SITE EXEC command, the pointer taintedness detector raises an alert indicating that the instruction SW $21,0($3) dereferences a tainted value in register ...
In this function, the expressionIt(start)is a temporary object. The language refuses to take a (non-const lvalue) reference to it, because the referent would be destroyed immediately at the semicolon of the return statement. You don't want to return a reference to a temporary value at all...
The following PoC could perform a RCE attack by corrupting a freedXML_Parserobject, making target program try to execute on an attacker-specified address (e.g.0x4141414141414141). Script to build PoC program #!/bin/shwget https://github.com/brechtsanders/xlsxio/releases/download/0.2.34/xlsxio...
as shown in FIG. 1. By corrupting the return address in the activation record, the attacker causes the program to jump to attack code when the victim function returns and dereferences the return address. This form of buffer overflow is called a “stack smashing attack” and is the most pop...
as shown in FIG. 1. By corrupting the return address in the activation record, the attacker causes the program to jump to attack code when the victim function returns and dereferences the return address. This form of buffer overflow is called a “stack smashing attack” and is the most pop...
each item might contain a function pointer that could be used to print, order, or otherwise manipulate the information. Each type of data item would contain a function pointer to the appropriate function. Function pointers provide a very tedious way to build an object, a data structure that co...