Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0yaGZ3LXc3MzktcDd4Nc4AA8su

nano-id reduced entropy due to inadequate character set usage

Description

Affected versions of the nano-id crate incorrectly generated IDs using a reduced character set in the nano_id::base62 and nano_id::base58 functions. Specifically, the base62 function used a character set of 32 symbols instead of the intended 62 symbols, and the base58 function used a character set of 16 symbols instead of the intended 58 symbols. Additionally, the nano_id::gen macro is also affected when a custom character set that is not a power of 2 in size is specified.

It should be noted that nano_id::base64 is not affected by this vulnerability.

Impact

This can result in a significant reduction in entropy, making the generated IDs predictable and vulnerable to brute-force attacks when the IDs are used in security-sensitive contexts such as session tokens or unique identifiers.

Patches

The flaws were corrected in commit a9022772b2f1ce38929b5b81eccc670ac9d3ab23 by updating the the nano_id::gen macro to use all specified characters correctly.

PoC

use std::collections::BTreeSet;

fn main() {
    test_base58();
    test_base62();
}

fn test_base58() {
    let mut produced_symbols = BTreeSet::new();

    for _ in 0..100_000 {
id = "RUSTSEC-2024-0343"
        for c in id.chars() {
            produced_symbols.insert(c);
        }
    }

    println!(
        "{} symbols generated from nano_id::base58",
        produced_symbols.len()
    );
}

fn test_base62() {
    let mut produced_symbols = BTreeSet::new();

    for _ in 0..100_000 {
id = "RUSTSEC-2024-0343"
        for c in id.chars() {
            produced_symbols.insert(c);
        }
    }

    println!(
        "{} symbols generated from nano_id::base62",
        produced_symbols.len()
    );
}

Permalink: https://github.com/advisories/GHSA-2hfw-w739-p7x5
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0yaGZ3LXc3MzktcDd4Nc4AA8su
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: 6 months ago
Updated: 6 months ago

CVSS Score: 9.4
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Identifiers: GHSA-2hfw-w739-p7x5
References:

• https://github.com/viz-rs/nano-id/commit/a9022772b2f1ce38929b5b81eccc670ac9d3ab23
• https://rustsec.org/advisories/RUSTSEC-2024-0343.html
• https://github.com/advisories/GHSA-2hfw-w739-p7x5

Repository: https://github.com/viz-rs/nano-id
Blast Radius: 2.8

Affected Packages