RUSTSEC-2023-0079

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Source
https://rustsec.org/advisories/RUSTSEC-2023-0079
Import Source
https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2023-0079.json
JSON Data
https://api.osv.dev/v1/vulns/RUSTSEC-2023-0079
Aliases
Published
2023-12-01T12:00:00Z
Modified
2024-04-12T21:07:31Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
KyberSlash: division timings depending on secrets
Details

Various Kyber software libraries in various environments leak secret information into timing, specifically because

  • these libraries include a line of code that divides a secret numerator by a public denominator,
  • the number of CPU cycles for division in various environments varies depending on the inputs to the division, and
  • this variation appears within the range of numerators used in these libraries.

The KyberSlash pages track which Kyber libraries have this issue, and include a FAQ about the issue.

Author

The KyberSlash pages were written by Daniel J. Bernstein. The FAQ originally said "I", but some people seemed to have trouble finding this authorship statement, so the FAQ now says "Bernstein" instead.

URL

The permanent link for the KyberSlash pages is https://kyberslash.cr.yp.to.

Mitigation status in pqc_kyber crate

The issue has not been resolved in the upstream pqc_kyber crate.

A third-party fork that mitigates this attack vector has been published as safe_pqc_kyber.

Alternatives

The ml-kem crate is a maintained alternative pure Rust implementation of ML-KEM / Kyber.

Database specific 
{
    "license": "CC0-1.0"
}
References

Affected packages

crates.io / pqc_kyber

Package

Name
pqc_kyber
View open source insights on deps.dev
Purl
pkg:cargo/pqc_kyber

Affected ranges

Type
SEMVER
Events
Introduced
0.0.0-0

Ecosystem specific 

{
    "affected_functions": null,
    "affects": {
        "os": [],
        "functions": [],
        "arch": []
    }
}

Database specific 

{
    "cvss": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
    "informational": null,
    "categories": [
        "crypto-failure"
    ]
}