![]() Something to note is that execute() must be hit twice because the first call to execute is for the wrapper code, and the second call executes the bytecode we’re after. #DECRYPT SOURCE GUARDIAN CODE#I've left out the SG wrapper code dump and excessive debugger output. I set a breakpoint on execute() so we can inspect the op_array and opcodes contained within. One unusual thing is this: the lineno is always 0.Īll debugging was performed in the GNU Debugger (GDB). Okay, so what does vld_dump_op() do? Essentially, it inspects the specified zend_op and outputs the relevant pieces. The goal is to decode this into something we can analyze. Here is a brief outline of the topics to be covered:īelow is a protected file. Many thanks to Derick Rethans and all who contributed to VLD! Finally, the end result is a modified version of the Vulcan Logic Dumper (VLD). ![]() Also we’ll perform some static and dynamic analysis of the SourceGuardian loader extension. We’ll get into some PHP 5.4 internals since this is the version Nagios XI was built on. ![]() In this article, we’ll walk through my process for revealing SourceGuardian-protected PHP bytecode. This didn’t sit well with me, and I had seen a research paper talking about how these types of code protection mechanisms could be broken. A chunk of the PHP code base was protected by SourceGuardian, so I couldn’t audit 65 files. But I felt I left a large stone unturned. ![]() Dumping PHP Opcodes Protected by SourceGuardian A detailed account of how I modified the Vulcan Logic Dumper to view PHP instructions protected by SourceGuardian But why?īack in early 2019, I researched Nagios XI and found some serious flaws. ![]()
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