Reported

July 9, 2020

Issued

October 1, 2020 (last modified: October 19, 2021)

Package

tough (crates.io)

Type

Vulnerability

Aliases

• CVE-2020-15093
• GHSA-5q2r-92f9-4m49

References

• https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49

Related

• CVE-2020-6174

CVSS Score

8.6 HIGH

CVSS Details

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

None

CVSS Vector

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

Patched

• >=0.7.1

Description

The tough library, prior to 0.7.1, does not properly verify the uniqueness of keys in the signatures provided to meet the threshold of cryptographic signatures. It allows someone with access to a valid signing key to create multiple valid signatures in order to circumvent TUF requiring a minimum threshold of unique keys before the metadata is considered valid.

AWS would like to thank Erick Tryzelaar of the Google Fuchsia Team for reporting this issue.

A fix is available in version 0.7.1.

CVE-2020-6174 is assigned to the same issue in the TUF reference implementation.

If you have any questions or comments about this advisory, contact AWS Security at aws-security@amazon.com.

Advisory available under CC0-1.0 license.