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HarryR avatar HarryR commented on July 4, 2024

Interesting tricks for PHP (to be expanded):

  • Array parameters, e.g. id vs id[] - try variations of parameters, rather than just their values
  • str_replace, this can be evaded in many cases, can the evasion be automated? (e.g. str_replace("'", "'", $var...);
  • RE expression = PHP's equivalent to C's format string exploits.

Other interesting classifiers - what type is the value? From functions that the value passes through can we determine what it's expected to be? This could reduce the scope of a brute-force phuzz attack. - https://recalll.co/app/?q=smarty%20-%20un-exploitable%20php%20functions%20(whitelist)

Related links:

TODO: research hackerone, collect trends on PHP vulns to find a good starting point for writing classifiers.

High-level categories:

  • Evade/Avoid (bypass filtering, anti-exploitation methods, null bytes, unicode hax)
  • Reflect (exploit trust when passing info, e.g. XSS)
  • Local (machine that executes the code)
  • Remote (machine that code communicates with)
  • Control (over syscalls... code execution etc.)
  • Expose (e.g. LFD, errors, info leaks, reveal IP addresses)

from phuzz.

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