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CVE-2021-45696 — Incorrect hash in sha2 — CVE Details

CRITICAL

Incorrect hash in sha2

Published January 6, 2022Updated November 8, 2023Source: osv

Summary

The v0.9.7 release of the sha2 crate introduced a new AVX2-accelerated backend which was automatically enabled for all x86/x86_64 CPUs where AVX2 support was autodetected at runtime. This backend was buggy and would miscompute results for long messages (i.e. messages spanning multiple SHA blocks). The crate has since been yanked, but any users who upgraded to v0.9.7 should immediately upgrade to v0.9.8 and recompute any hashes which were previously computed by v0.9.7.

Advisory Timeline

  • First published January 6, 2022 (1740 days ago).
  • Last revised November 8, 2023 — 670 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update sha2 to 0.9.8 or later
cargo update -p sha2 --precise 0.9.8

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
sha2
crates.io
0.9.70.9.8

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-327
    Use of a Broken or Risky Cryptographic AlgorithmMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2021-45696?
Incorrect hash in sha2 This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-45696?
CVE-2021-45696 affects sha2. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-45696 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-fc7x-2cmc-8j2g
GHSA-xpww-g9jx-hp8r
RUSTSEC-2021-0100

Related CVEs

More crates.io advisories

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