RUSTSEC-2021-0044

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Source

https://rustsec.org/advisories/RUSTSEC-2021-0044

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2021-0044.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2021-0044

Aliases

Published

2021-02-09T12:00:00Z

Modified

2023-11-08T04:05:43.819286Z

Severity

7.3 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator

Summary

Use after free possible in `uri::Formatter` on panic

Details

Affected versions of this crate transmuted a &str to a &'static str before pushing it into a StackVec, this value was then popped later in the same function.

This was assumed to be safe because the reference would be valid while the method's stack was active. In between the push and the pop, however, a function f was called that could invoke a user provided function.

If the user provided panicked, then the assumption used by the function was no longer true and the transmute to &'static would create an illegal static reference to the string. This could result in a freed string being used during (such as in a Drop implementation) or after (e.g through catch_unwind) the panic unwinding.

This flaw was corrected in commit e325e2f by using a guard object to ensure that the &'static str was dropped inside the function.

Database specific

{
    "license": "CC0-1.0"
}

References

Affected packages

crates.io / rocket

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

0.4.7

Ecosystem specific

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

Database specific

{
    "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
    "informational": "unsound",
    "categories": [
        "memory-corruption"
    ]
}