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The vulnerability exists within the `shaman::cryptoutil::write_u64v_le` function and related methods. These functions are responsible for writing data into a mutable byte buffer. The core issue is that these functions do not adequately validate input parameters when the provided source and destination lengths are zero. Under these specific conditions, the functions may return a slice or buffer that is technically empty but was created without performing the necessary bounds checks. This bypass of Rust’s standard safety guarantees can later lead to undefined behavior if the resulting buffer is used with `get_unchecked` or similar unsafe operations, as the underlying memory might be accessed incorrectly. Since the Shaman crate is unmaintained, this soundness issue will not be formally fixed, leaving applications that depend on it at potential risk.
Platform: Rust Crate
Version: All versions
Vulnerability: Memory Safety
Severity: Low
date: 2025-11-03
Prediction: No Patch
What Undercode Say:
cargo tree | grep shaman
use shaman::cryptoutil::{write_u64v_le};
let mut buffer = [0u8; 8];
// Calling with zero lengths may cause issues
let _ = write_u64v_le(&mut buffer, &[]);
How Exploit:
Craft input triggering zero-length copy operation to create an invalid buffer for subsequent unsafe usage.
Protection from this CVE
Discontinue using the unmaintained Shaman crate. Migrate to a maintained alternative.
Impact:
Potential memory corruption leading to crashes or undefined behavior in applications using the affected functions with zero-length parameters.
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Sources:
Reported By: github.com
Extra Source Hub:
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