RUSTSEC-2020-0061

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Source

https://rustsec.org/advisories/RUSTSEC-2020-0061

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2020-0061.json

JSON Data

https://api.osv.dev/v1/vulns/RUSTSEC-2020-0061

Aliases

CVE-2020-35907
GHSA-p9m5-3hj7-cp5r

Published

2020-05-03T12:00:00Z

Modified

2023-11-08T04:03:38.673466Z

Severity

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

Summary

futures_task::noop_waker_ref can segfault due to dereferencing a NULL pointer

Details

Affected versions of the crate used a UnsafeCell in thread-local storage to return a noop waker reference, assuming that the reference would never be returned from another thread.

This resulted in a segmentation fault crash if Waker::wake_by_ref() was called on a waker returned from another thread due to it attempting to dereference a pointer that wasn't accessible from the main thread.

Reproduction Example (from issue):

use futures_task::noop_waker_ref;
fn main() {
    let waker = std::thread::spawn(|| noop_waker_ref()).join().unwrap();
    waker.wake_by_ref();
}

The flaw was corrected by using a OnceCell::Lazy<> wrapper around the noop waker instead of thread-local storage.

Database specific

{
    "license": "CC0-1.0"
}

References

Affected packages

crates.io / futures-task

Package

Name: futures-task; View open source insights on deps.dev
Purl: pkg:cargo/futures-task

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

0.3.5

Ecosystem specific

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

Database specific

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