format-string-exploitation

Format string vulnerabilities allow memory reading by leveraging printf-family functions with specifiers like %p to leak stack data and determine offsets. This skill provides a structured playbook for safely outlining memory read strategies.

Controlled memory writes during format string exploitation use %n, %hn, or %hhn specifiers to write values to targeted addresses. This playbook outlines strategies for executing memory write primitives and GOT overwrites.

Format string exploitation works with 64-bit binaries and ASLR by addressing 64-bit address width constraints and Fortify-related limitations. The playbook details leaking canaries and computing PIE and libc base addresses to bypass these protections.

A GOT overwrite redirects execution flow by writing controlled values to the Global Offset Table using format string vulnerabilities. It is needed for binary exploitation when bypassing protections like canaries, PIE, and ASLR to achieve code execution.

Calculate format string offsets for a CTF exploit payload by using specifiers like %p to leak stack values and identify the exact distance to your input. This playbook guides crafting payloads that leak canaries and compute base addresses.

Format string exploitation with Fortify source faces limitations because FORTIFY replaces printf-family functions with safer versions that abort on illegal %n usage. This playbook addresses navigating these 64-bit addressing constraints during exploit development.