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There are three leaks, each of which amounts to a minor DAC bypass.
1. Leakage of file/directory existence via stat() calls (e.g.
determining if a file exists regardless of search permissions on
2. Leakage of directory existence via realpath()
3. Arbitrary MD5 comparison (e.g. ability to determine if any two
files have identical MD5 hashes, regardless of read permissions on
No preference for single vs. multiple CVEs.