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Binary Webshell Through OPcache in PHP 7
A PHP 7 exploitation technique: OPcache's file cache stores compiled bytecode under a folder writable by the web user. Given an unrestricted file upload and the target's system_id (an md5 fingerprint computable from phpinfo()), an attacker overwrites a cached .bin file with a compiled webshell that runs when the matching PHP script is requested, bypassing hardened read-only web roots. Variants defeat memory-cache priority and timestamp validation using WordPress's known-static file timestamps.
Record
- Researcher
- Ian Bouchard
- Published by
- GoSecure
- Date
- Topic
- Server
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This page is the archive's own catalogue record. The research is the work of Ian Bouchard, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on .