Reverse Engineering rpcss.dll: Hunting for the ROT's Hidden Structure

Your analysis of the COM+ Running Object Table (ROT) is quite insightful, especially regarding its internal structure and security mechanisms. Let's break down your findings and discuss their implications:

Key Findings

1. Memory Layout:

   • You've identified the memory layout of CScmRotEntry and noted the "crot" magic signature at offset 0x50, which is useful for identifying valid entries in memory.
   • The presence of a private reference counting mechanism (CToken) for integrity level tokens indicates that the ROT manages its own security context independently from standard COM object lifetimes.

2. Security Mechanisms:

   • You've uncovered three distinct access control mechanisms applied sequentially when accessing an entry via CScmRot::GetObject:
     1. Trust Check: Ensures the entry is trusted.
     2. Accessibility Check: Determines if the entry can be accessed by the calling process.
     3. Integrity Level Comparison: Compares the integrity levels of the requesting process and the ROT entry to ensure that higher-integrity entries cannot be shadowed by lower-integrity ones.

Implications

1. Security Model:
   • The undocumented

Read the full article at DEV Community

---

Want to create content about this topic? Use Nemati AI tools to generate articles, social posts, and more.