CVE-2020-15093 Improper verification of signature threshold in tough

2020-07-0918:45:16

CWE-347

GitHub_M

www.cve.org

CVSS3

8.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

9.1

Confidence

High

EPSS

0.002

Percentile

60.7%

JSON

The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. A fix is available in version 0.7.1. CVE-2020-6174 is assigned to the same vulnerability in the TUF reference implementation.

CNA Affected

[
  {
    "product": "tough",
    "vendor": "awslabs",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.7.1"
      }
    ]
  }
]