Comments (1)
Interesting tricks for PHP (to be expanded):
- Array parameters, e.g.
id
vsid[]
- 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:
- http://stackoverflow.com/questions/3115559/exploitable-php-functions
- https://github.com/Dionach/magicmapping
- https://blog.php-dev.info/downloads/Assault_on_PHP_Applications.pdf
- http://php-security.org/MOPB/
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)
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