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  5. CVE-2020-25576

CVE-2020-25576: Unaligned memory access in rand_core

August 25, 2021

Affected versions of this crate violated alignment when casting byte slices to integer slices, resulting in undefined behavior. rand_core::BlockRng::next_u64 and rand_core::BlockRng::fill_bytes are affected.

References

  • github.com/advisories/GHSA-mmc9-pwm7-qj5w
  • github.com/rust-random/rand
  • github.com/rust-random/rand/blob/master/rand_core/CHANGELOG.md
  • github.com/rust-random/rand/security/advisories/GHSA-mmc9-pwm7-qj5w
  • nvd.nist.gov/vuln/detail/CVE-2020-25576
  • rustsec.org/advisories/RUSTSEC-2019-0035.html

Code Behaviors & Features

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Affected versions

All versions before 0.3.1, all versions starting from 0.4.0 before 0.4.2

Fixed versions

  • 0.4.2
  • 0.3.1

Solution

Upgrade to versions 0.3.1, 0.4.2 or above.

Impact 9.8 CRITICAL

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

Learn more about CVSS

Weakness

  • CWE-704: Incorrect Type Conversion or Cast

Source file

cargo/rand_core/CVE-2020-25576.yml

Spotted a mistake? Edit the file on GitLab.

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