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How the CVE Works
The vulnerability resides in the `create_ring_buffer` function. This function unsafely allocates a buffer using Vec::with_capacity, which reserves memory but does not initialize it. It then uses `set_len` to mark this entire uninitialized memory block as a valid, initialized Box<
></code>. This action breaks Rust's core safety guarantees. When subsequent safe functions, such as <code>write_slices</code>, obtain a typed mutable reference (like <code>&mut [bash]</code>) to this buffer, they are operating on uninitialized memory. This constitutes undefined behavior, as reading from uninitialized memory can lead to program crashes, information leaks, or other unpredictable outcomes. The use of the Miri interpreter confirmed the presence of this invalid memory access. <h2 style="color: blue;">DailyCVE Form</h2> Platform: Rust Crate Version: <0.2.2 Vulnerability: Memory Exposure Severity: Low Date: 2024-10-21 <h2 style="color: blue;">Prediction: Patch 2024-10-21</h2> <h2 style="color: blue;">What Undercode Say:</h2> [bash] cargo install cargo-audit cargo audit
[bash] direct-ring-buffer = "0.2.2"
// Miri command to detect UB cargo miri run
How Exploit:
Read uninitialized memory.
Protection from this CVE
Update to v0.2.2.
Impact:
Information Disclosure.
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
