Format String Finder

Author: jofra

Finds format string vulnerabilities

Description:

This plugin will detect format string vulnerabilities and printf-like functions.

Example

How it works

1. Loads known functions that receive a format parameter.
2. For each xref of these functions find where the fmt parameter comes from:
   1. If it comes from an argument we mark it as a printf-like function and test its xrefs
   2. If it is a constant value located in a read-only area we mark it as safe
   3. If it comes from a known 'safe' function call result (functions from the dgettext family) we mark it as safe
   4. Otherwise we mark it as vulnerable
3. Prints a markdown report

Settings

• format_string_finder.should_highlight_variable_trace:
  • Highlight instructions that are used in the trace of the format parameter origin.
• format_string_finder.should_enable_tests_plugin
  • Enable the tests plugin. Only for development.