SCSIR Crate, Unsound Integer Handling, CVE-2025-XXXX (Low Severity)

How the CVE Works

The vulnerability (CVE-2025-XXXX) in the `scsir` crate v0.2.0 for Rust arises due to improper handling of the `group_number` field. Hardware devices often expect a small bit-width (e.g., 5 bits) for group numbers, but the crate fails to enforce this restriction. This can lead to an integer overflow when a larger value is supplied, potentially causing undefined behavior or incorrect hardware interactions. The issue stems from missing bounds checks before passing the value to low-level hardware operations, making it possible for attackers to trigger memory corruption or unexpected device behavior.

DailyCVE Form

Platform: Rust Crate
Version: 0.2.0
Vulnerability: Integer Overflow
Severity: Low
Date: May 24, 2025

Prediction: Patch by June 10, 2025

What Undercode Say:

Exploitation Analysis

• Attackers may craft malicious `group_number` values exceeding hardware limits.
• Exploitable via direct API misuse in dependent applications.
• Could lead to denial-of-service (DoS) or memory corruption.

Protection Measures

• Validate `group_number` bounds before processing.
• Use Rust’s `

  ` for safety-critical functions.</li>
  <li>Update to patched version post-release.</li>
  </ul>
  
  <h2 style="color: blue;">Code Fix Example</h2>
  
  [bash]
  fn set_group_number(&mut self, group: u8) -> Result<(), Error> {
  if group > 0x1F { // Enforce 5-bit limit
  return Err(Error::InvalidGroup);
  }
  self.group_number = group;
  Ok(())
  }
  

  Detection Command

  cargo audit --ignore RUSTSEC-2025-XXXX
  

  Mitigation Steps

  1. Upgrade `scsir` to >=0.2.1 post-patch.

  2. Audit dependent code for unchecked `group_number` usage.

  3. Enable Rust’s overflow checks in `Cargo.toml`:

  [profile.release]
  overflow-checks = true
  

  Exploit PoC (Hypothetical)

  let mut cmd = WriteSameCommand::new();
  cmd.set_group_number(0xFF); // Triggers overflow
  

  Logging Recommendations

  log::warn!("Invalid group_number: {}", group);
  

  Static Analysis

  • Use `clippy` with ![deny(clippy::arithmetic_side_effects)].
  • Integrate `cargo-geiger` for unsafe code audit.

  Hardening

  • Replace `u8` with `NonZeroU8` for group numbers.
  • Implement fuzz testing via cargo fuzz.

  References

  • RustSec Advisory
  • CVE Details

  Sources:

  Reported By: github.com
  Extra Source Hub:
  Undercode

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