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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTVxMnItOTJmOS00bTQ5

Improper verification of signature threshold in tough


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.


No workarounds to this issue are known.


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

For more information

If you have any questions or comments about this advisory, contact AWS Security at [email protected].

Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: about 1 year ago

CVSS Score: 8.6
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Identifiers: GHSA-5q2r-92f9-4m49, CVE-2020-15093
References: Repository:
Blast Radius: 14.7

Affected Packages

Dependent packages: 4
Dependent repositories: 51
Downloads: 777,296 total
Affected Version Ranges: < 0.7.1
Fixed in: 0.7.1
All affected versions: 0.0.0, 0.1.0, 0.2.0, 0.3.0, 0.4.0, 0.5.0, 0.6.0, 0.7.0
All unaffected versions: 0.7.1, 0.8.0, 0.9.0, 0.10.0, 0.11.0, 0.11.1, 0.11.2, 0.11.3, 0.12.0, 0.12.1, 0.12.2, 0.12.3, 0.12.4, 0.12.5, 0.13.0, 0.14.0, 0.15.0, 0.16.0, 0.17.0, 0.17.1